Mdadm stop reshape. So I partitioned and readded the disk.

Mdadm stop reshape why? Previous by thread: mdadm reshape stop, resume with alternate/moved backup file? Jul 6, 2021 · If you're lucky (appropriate metadata superblock format, superblock v1. Two minutes after the assemble attempt, A reassemble requires a --stop, (optionally my plugging in the failed drive, --stop again), and then the --assemble command. Normally, mdadm does not create any device nodes in /dev, Mar 12, 2023 · Put a brand new one in and now it is reshaping. Why does it keep saying it's busy. Unconditional devices count printing in --detail from Anna Sztukowska. org, a friendly and active Linux Community. All in all this looks like a case where I might resort to hexediting metadata to proceed, or use two sets of overlays, two mdadm --create (reflecting both pre and post grow state) then stitch it with dm-linear at the reshape pos just to get access to files Aug 1, 2018 · $ mdadm --detail /dev/md0 /dev/md0: Version : 1. Apr 20, 2011 · I have a two disk, RAID 1 set up from mdadm. 0 uuid printing fixes from Mariusz Tkaczyk. The reason this was created as a 2 disk raid5 instead of a 2 disk raid1 was that I read somewhere this Jan 15, 2025 · mdadm --stop /dev/md0 shutdown -P now when i got the box back up and running, i used the following command to bring the raid back up, since it wouldnt come up by itself. Jan 3, 2017 · Problem: When I add sda3 to /dev/md3 the speed of two disk decrease a lot, it decrease to ~100k Question about why it decrease the speed. conf(5) for information about this file. Ensure there's nothing in the output of sudo vgdisplay. However, some days ago, I added a disk to my RAID6 array of six drives and there was no progress in the reshape. Hic sunt dracones 🐉 Storage - swraid simple_reshape: mdadm: failed to stop array /dev/md0: Device or resource busy Snippet of test failure Running 'mdadm --stop /dev/md0' mdadm: failed to stop array /dev/md0: Device or resource busy Perhaps a running process, sudo mdadm /dev/md0 --fail /dev/sda1 --remove /dev/sda1 To succeed, both the fail and remove actions must be specified. MDADM_NO_UDEV. 2 Creation Time : Wed Mar 4 17:47:47 2020 Raid Level : raid6 Array Size : 7804860416 (7443. 31 GB) Used Dev Size : 2930139648 (2794. You may get May 12, 2011 · Yes, you can reshape raid5 to raid6, provided you have a recent enough version of mdadm. Was getting missing super block errors when trying to moun /dev/md2 mdadm --stop /dev/md2 mdadm --assemble --scan --force /dev/md2 --freeze-reshape Option is intended to be used in start-up scripts during initrd boot phase. ? like mysql, apache, json, etc Is some connector bad, (connector from motherboard to hard disk)? Feb 7, 2013 · Hello all, During a reshape of a RAID6, one of the disks in the array crashed hard. \n" " mdadm --grow options device\n" " resize/reshape an active array\n" " mdadm --incremental device\n" " add/remove a device to/from an array as appropriate\n 2 days ago · Author: Thomas Niedermeier Thomas Niedermeier working in the product management team at Thomas-Krenn, completed his bachelor's degree in business informatics at the Deggendorf University of Applied Sciences. You are currently viewing LQ as a guest. Provided by: mdadm_3. All disks are WD Red 4TB, so I have 8TB of usable space. (Maybe because a reshape is happening right now) Apr 26, 2017 · # mdadm --grow /dev/md0 --size=max mdadm: component size of /dev/md0 has been set to 2147479552K But as you can see it only sees the 2TB. mdadm --add /dev/md0 /dev/sda. Decrease the size of the partition that you removed in the previous step to a size that is slightly larger than the size you set for the segment size. 89 GiB 2000. 방문 중인 사이트에서 설명을 제공하지 않습니다. Currently supported growth options including changing the active size of component devices and changing the number of active devices in Linear and RAID levels 0/1/4/5/6, changing the RAID mdadm --stop --scan This will shut down all arrays that can be shut down May 3, 2020 · I recently expanded my mdadm raid6, shortly after starting the reshape i noticed that i added the bare device to the raid. How should I do this? Devices in Jan 7, 2018 · I'm using mdadm and I'm running a grow operation on my 3 drive Raid 5 to make it use 4 drives. # mdadm --stop /dev/md/test mdadm: stopped /dev/md/test. But the feature map Contribute to djbw/mdadm development by creating an account on GitHub. Once the device is failed, you can remove it from the array with mdadm --remove: sudo mdadm /dev/md0 --remove /dev/sdc. 04. Recently I bought 4th WD Red 4TB drive to migrate my 3-disk RAID5 setup to RAID6. When it is used with -S or --scan option, Jan 15, 2025 · --bitmap=none: Remove/disable any bitmaps. just to make sure there is no hardware misbehavior involved. 53 GB) Used Dev Size : 1953382400 (1862. 99 GiB 40002. Provided by: mdadm_4. I had a 4 disk RAID5 and one disk failed. 1_amd64 NAME mdadm - manage MD devices aka Linux Software RAID SYNOPSIS mdadm [mode] <raiddevice> [options] <component-devices> DESCRIPTION RAID devices are virtual devices created from two or more real block devices. Stop the array. I decided to do several things in one operation: 1) remove the failing disk 2) add new one to replace it 3) add a few more disks to the array and grow it Nov 20, 2016 · I have been using webmin to manage my RAID array for several years, and I never had any reason to use the mdadm commands in the terminal. Registration is quick, simple and absolutely free. 2_amd64 NAME mdadm - manage MD devices aka Linux Software RAID SYNOPSIS mdadm [mode] <raiddevice> [options] <component-devices> DESCRIPTION RAID devices are virtual devices created from two or more real block devices. If you try it again , it will back reshape md0. You can follow our Ubuntu 16. 3 box, one disk failed, and was marked as such in the array, but is not allowing me to remove it: # mdadm /dev/md127 --fail /dev/sdg mdadm: set /dev/sdg faulty in /dev/md127 # mdadm /dev/md127 --remove /dev/sdg mdadm: hot remove failed for /dev/sdg: Device or resource Apr 10, 2017 · R A I D목적여러개의 디스크를 합쳐서 하나의 디스크처럼 동작하게 함얻는 효과 : 디스크의 남는용량을 재활용하고 디스크보다 용량이 큰 파일을 저장할 수 있다. mdadm --assemble --force --verbose /dev/md0 /dev/sd[abcd] Raid is not a backup! Jun 17, 2024 · Due to reading issue of the faulty disk, reshape operation estimated duration is more or less 6 months. ) The RAID itself is just a bunch of drives connected via external SATA to a Slackware 13. To shrink, you first shrink the filesystem (resize2fs) then second shrink the block device (mdadm). This is a reversible change which simply makes the end of the Jan 18, 2025 · If you don't have backup file, you still can continue to reshape, you need to stop array with. Stop the md; Backup the first few MiB of each partition of the md (assuming the RAID superblocks are near the start of each partition) Dec 6, 2023 · 3. I currently have a 4 disk raid 5 array that’s just over 50% full so I want to remove one of the drives, there’s a lot of information scattered around on google relating to this and some of it is unfortunately outdated. This took several days and went uninterrupted. # # by default (built-in), scan all partitions (/proc/partitions) and all # containers for MD superblocks. Jan 17, 2025 · MDADM(8) System Manager's Manual MDADM(8) NAME top mdadm - manage MD devices aka Linux Software RAID SYNOPSIS top mdadm [mode] <raiddevice> [options] <component-devices> DESCRIPTION top RAID devices are virtual devices created from two or more real block devices. That should get the reshape running at a decent speed. 2 ), then you can simply use mdadm --zero-superblocks ( from a livecd or otherwise with the array stopped ) to zap the raid superblocks, and then can access the disk normally. The reshape has resumed, but I fear there is some corruption Grow (or shrink) an array, or otherwise reshape it in some way. If everything looks fine but md still got stuck, that's usually a bug in the kernel. 2. Unmount all filesystems on the array. Jun 21, 2013 · mdadm has a --freeze-reshape option to prevent reshape resume at boot/assembly time. In general, the order of operations is this, where completing each step makes it possible to do the next step: Stop any programs using filesystems on the array. Apr 27, 2016 · This is consistent. 99 GiB 15002. (Both tested via dd on 48Gb file, RAM size is 1Gb, It was reshaping for a few hours (~20hours or so) when I accidentally restarted (after some other updates). if in doubt try kicking it off from a SystemRescueCD or similar environment. If I try forcing it higher: Remove the spare from the md, then re-add it to the RAID set as a new drive. 55 TiB 16. Now, nothing's working. Is there an easier way to do this mdadm --remove /dev/md0; All went well and I didn't even loose any data. There are others that you may test in your case. 8. 01 TB) Used Dev Size : 15627725312 (14. 88 GiB 5000. But write speed is just 37. I would like to add one more disk to array, sdc and move all data from sdb to it. root@openmediavault:~# mdadm --stop /dev/md127 --force mdadm: Cannot get exclusive access to /dev/md127:Perhaps a running process, mounted filesystem or active volume group? Mar 12, 2020 · Not (yet) tested (don't trust important data to the steps below) but here an idea for any scenario where the usable space is increased and mdadm --grow says "RAID10 layout too complex for Grow operation":. As if i assemble it normally all my mdadm commands referring to /dev/md0 freeze and i cant do anything in the terminal. Currently supported growth options including changing the active size of component devices and changing the number of active devices in Linear and RAID levels 0/1/4/5/6, changing the RAID mdadm --stop --scan This will shut down all arrays that can be shut down Grow (or shrink) an array, or otherwise reshape it in some way. VolGroupArray-name. Jan 14, 2025 · Grow (or shrink) an array, or otherwise reshape it in some way. However after re-creating the array, the volume was still not showing on the web interface. Mar 14, 2018 · You can't stop a "parity check" as even though all the data is there, mdadm's metadata isn't correct. If Mar 14, 2018 · You can't stop a "parity check" as even though all the data is there, mdadm's metadata isn't correct. I removed it from the array and had it in a degraded state for a while: mdadm --manage /dev/md127 --fail /dev/sde1 --remove /dev/sde1 My data requirement suddenly dropped so I decided to permanently reduce the array to 3 disks. 2 Creation Time : XXXXXXXXXXXXXXXX Raid Level : raid4 Array Size : 11718754304 (11175. 4 days ago · Grow (or shrink) an array, or otherwise reshape it in some way. This allows multiple devices (typically disk drives or partitions thereof) to be combined into a May 19, 2015 · Give yourself a little extra room just to be sure. Skip such as add,remove,fail report on or modify various md related devices. 100% cpu on the raid component, but not the reshape. 3-2ubuntu7. If you are using mdadm superblock format 0. * Remove 1 obsolete maintscript entry. 00 GB) Raid Devices : 3 Total Devices : 2 Update Time : XXXXXXXXXXXXXXXX State : clean, FAILED, reshaping Active Devices : 1 Jan 30, 2023 · Edit: Once the reshape finished the drive became fully accessible again. To undo grow, there is mdadm --assemble --update=revert-reshape, but it involves stopping/restarting the array and it usually can't be done on a running kernel where md is already stuck due to a Jun 18, 2015 · I was reshaping my array from 10 disks to 11 to a degraded state (drive I want to add already has data on it, mdadm: /dev/md0 has failed so using --add cannot work and might destroy mdadm: data on /dev/sdX1. Running command: /sbin/mdadm --grow /dev/md2 --force -l 6 -n 6 --backup Apr 29, 2013 · To guarantee between 1 and 100MB available for rebuilds, if the server is active upping the min is a good way to speed things up, but at the cost of some responsiveness. To identify if multiple drives have been disconnected during a RAID 5 reshape, you can use the mdadm command in Linux. g. Apr 2, 2021 · #mdadm --detail /dev/md0 Version : 1. I experience monthly ~31h array resyncs. Then you can reshape the array down to only one disk, and remove the second disk. It is on 0% complete. This allows multiple devices (typically disk drives or parti- tions thereof) to Jan 16, 2025 · According to this blog post by Neil Brown (the creator of mdadm), you can avoid the speed penalty due to mdadm's block range backup process by:. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. 5 - 18th May 2012 $ uname -r 3. If the config file given is partitions then nothing will be read, but mdadm will act as though the config file contained exactly DEVICE partitions containers and will read /proc/partitions to find a list of devices to scan, and /proc/mdstat to find a list of containers to examine. Sep 17, 2017 · At some point, I checked dmesg and noticed some lines saying some MD tasks had blocked for more than x seconds. Since rebooting, I've tried: Jan 9, 2021 · mdadm --add /dev/md1 /dev/sda2 mdadm --grow /dev/md1 --raid-devices=5 But sadly I forgot a reshape was in progress and I did a clean shutdown of the server. Oct 12, 2024 · # mdadm --zero-superblock /dev/sdb1 /dev/sdc1. probably process was not began and waiting does not make sense. You've destroyed your data. Jan 15, 2025 · I have a mdadm RAID-6 in my home server of 5x1Tb WD Green HDDs. Grow (or shrink) an array, or otherwise reshape it in some way. Aug 16, 2017 · This triggerd a reshape process. Is there a way to revert the reshape and go back to 3 drives? Oct 30, 2012 · Which I appended it to /etc/mdadm/mdadm. This cheat sheet will show the most common usages of mdadm to manage software raid arrays; it assumes you have a good understanding of software RAID and Linux in general, and it will just explain the Dec 17, 2024 · It’s also a required step when you need to reassemble or remove the RAID array entirely. Apr 6, 2021 · As you see, the minimum value starts from 1000 and can max upto 200K. mdadm /dev/md4--fail detached--remove detached Any devices which are components of /dev/md4 will be marked as faulty and then remove from the array. I have 5 drives all OK and detected as part of the raid array. That simulates a reboot. Somewhere during the reshape, So i wanted to roll back the thing: mdadm --fail /dev/md0 /dev/sdb1 mdadm --remove /dev/md0 /dev/sdb1 How can i get back to the old state? I tried. Hi, I've got an 8 disks RAID 5 array I want to expand with 3 more disks, but I can't extend the array, I'm getting the same message everytime: I am trying to add the first disk it with that command: mdadm --grow /dev/md3 --raid-devices=9 --add /dev/sdi1 mdadm: Cannot open /dev/sdi1: Device or resource busy mdadm: Failed to initiate reshape! --freeze-reshape This option is intended to be used in start-up scripts during the initrd boot phase. But, things started to get nasty when you try to rebuild or re-sync large size array. Reshaping the array for capacity or performance changes; Stop the RAID array: mdadm --stop /dev/md0 Zero the superblock on the disk: mdadm --zero-superblock /dev/sda4 After that, you can remove the mount point in /etc/fstab and also remove the RAID configuration from /etc/mdadm/mdadm. In the Linux kernel, the following vulnerability has been resolved: md/raid5: avoid BUG_ON() while continue reshape after reassembling Currently, mdadm support --revert-reshape to abort the reshape while to WARN_ON(), and stop the reshape if checkings fail. conf, see below: # mdadm. If both drives are equal, you can just pick one drive. [ Graham Inggs ] * Ship /etc/mdadm directory again to prevent dpkg warning: unable to delete old directory '/etc/mdadm': Directory not empty Jan 7, 2025 · Raid6 mdadm reshape operation interrupted - now cannot mount or examine Edit: Once the reshape finished the drive became fully accessible again. Currently supported growth options including changing the active size of component devices and changing the number of active devices in Linear and RAID levels 0/1/4/5/6, changing the RAID mdadm --stop --scan This will shut down all arrays that can be shut down Mar 25, 2015 · I added 1 disk to my raid array, started reshaping, and then remembered that I forgot to partition the drive. Fine. The number of copies that are stored with mdadm style RAID 10 is configurable. The reshape operation therefore failed to start. However, when I try to remove the drive, I get an error: # mdadm /dev/md127 --remove /dev/sdg Jan 15, 2025 · My mdadm RAID5 array just underwent a 5>8 disk grow and reshape. (below 12-hours progress) $ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] I would love telling mdadm to stop reading the faulty disk but it seems stopping reshaping operation may lead to data loss. Find VMD bus manually if link is not available from Mariusz Tkaczyk. Aside from the control file, there should be a Device Mapper device named after your volume group, e. Phew that was a bit scary. Then mkfs the array and restore from backup. If that is so, what's the mdadm command line for reshaping a 2-disk RAID1 into a degraded 2-disk RAID5 and what are the consequences [in the theoretical case of none of the drives ever failing]? Dec 16, 2024 · mdadm MDADM(8) System Manager's Manual MDADM(8) NAME mdadm - manage MD devices aka Linux Software RAID SYNOPSIS mdadm [mode] <raiddevice> [options] <component-devices> DESCRIPTION RAID devices are virtual devices created from two or more real block devices. I put the backupfile in /root/md0_grow. Then you can convert the raid0 into a degraded raid4, which supports reshaping ( raid0 does not, but a degraded raid4 is essentially the same thing as a raid0 ). When the rebuild finished I started a reshape, but mdadm is reeeaaaally slow and I didn't figure out why that's why I'm here. /dev/sda not /dev/sda1). Aug 20, 2020 · mdadm reshape stop, resume with alternate/moved backup file? From: Michael Evans; Prev by Date: mdadm reshape stop, resume with alternate/moved backup file? Next by Date: Re: system update killed /boot RAID-1 array auto-assembly/mount. I've created a RAID 6 array from above 24 disks. 13548 Number Major Minor RaidDevice State Aug 24, 2024 · On first reboot into OMV the now 3 disk raid5 test array mounted OK, but there is an inconsistency between cat /etc/mdadm/mdadm. Sep 24, 2024 · If the disconnected drives are among those being added or removed during the reshape, it might be impossible to recover the array without data loss. This will typically go in a system shutdown script. 종류#1 ) H/W Raid *성능이 뛰어나다. You should stop the array and re-assemble it. Obviously this is no replacement for a full backup of all your data, but it gives you a retreat path if for some reason you goof up while modding the partition tables. The reshape has resumed, but I fear there is some corruption Feb 3, 2016 · At the same time I bought another disk to update my raid 5 to raid 6. 26 GB) Raid Devices : 4 Total Devices : 4 Persistence May 8, 2024 · Side note- It might help me to understand what mdadm reshape is looping / stuck on exactly. Stop RAID Array on the Source System: Before removing the drives, stop the RAID array on the source system. In addition, the software raid has unexpected disconnects to disk 2, which drops it to degraded mode. It will be because the server is running in normal mode, and all services are in operation. It's hard to know how/when your porblem occurred. The -A or --assemble options assemble a previously create array. Jan 15, 2025 · Idle will move the reshare to the next block , ex if it was md0 , it will reshape md1. it seems neccessary to stop the raid device (thus making the file system temporarily unavailable!) in order to force sync of repaired chunk. conf and mdadm --detail --scan --verbose You can fix that by running: omv-salt deploy run mdadm initramfs But that's not going to fix your filesystem problem. Disconnect sdb. run mdadm --add /dev/md127 /dev/sdd; run watch cat /proc/mdstat again. 09 GB) Raid Devices : 5 Total Devices : 4 Persistence : Superblock is persistent Update Time : Tue Jun 25 07:07:02 2024 State : clean, degraded, Sep 2, 2018 · The first command backups the data to file and starts the reshaping process. For instance, in some systems disabling NCQ on each disk may help. Jul 4, 2024 · root@PLGDIM:~ # mdadm -D /dev/md1 /dev/md1: Version : 1. In reshape cases, if two devices claims different reshape progresses, we cannot forcely assemble them back to array. need to stop raid device. OK -> mdadm --stop /dev/md0 you should get mdadm stopped as the output. Hello all, During a reshape of a RAID6, one of the disks in the array crashed hard. I had a power failure while a raid6 array was being reshaped, and now certain operations cannot be run against it, including Jan 1, 2018 · I currently am stuck at creating the 2-disk RAID5 array. 1-5ubuntu1. mdadm --detail --verbose /dev/md6 /dev/md6: Version : 1. I hope that these tips will help you doing fast rebuilds in your RAID array :) Related articles; How to fix mdadm RAID5 / RAID6 growing stuck at 0K/s ? Anyone familiar with MDADM rebuilds give me pointers. The array Size should obviously be at 8000GB (2TB x4) if the reshape was completed instead of 6000GB. 5h hours, however i would like to move my computer earlier than that will be finished. Output. 2 Feature Map : 0x45 Array UUID : aedf8d12:48037c00:6fbe8b20:f5346024 Name : r720:1 (local to host r720) Creation Time : Mon Jan 30 14:58:58 2023 Raid Level : raid6 Raid Devices : 10 Avail Dev Size : 9766176701 (4656. Jan 6, 2024 · If this is locked (greyed out) (maybe because a reshape is in action) try to do it over the CLI. Smartd reported that one of the disks started failing. d/mdadm. 9. Side Note: If you are having this issue repeatedly look into hardware failures as the culprit and solve asap! At the same time I bought another disk to update my raid 5 to raid 6. Example Output: Oct 10, 2024 · /dev/sda1: Magic : a92b4efc Version : 1. 5) and mdadm (v3. This should be much faster. 00 GB) Used Dev Size : 11718754304 (11175. am I waiting for an unrecoverable array if this reshape completes? Mdadm is attempting to grow a 4 disk array to a 5 disk array using 3 drives My guess would be that it won't stop. 04 initial server setup guide to set up an appropriate user. bak. \n" " mdadm --grow options device\n" " resize/reshape an active array\n" " mdadm --incremental device\n" " add/remove a device to/from an array as appropriate\n Oct 13, 2024 · mdadm: /dev/md3 assembled Attempting to assemble the array with 5 out of 5 drives works briefly but, no matter what I do, mdadm tries to finish reshaping. mdadm: /dev/md2: Something wrong - reshape aborted How can I --grow a RAID6 to use more devices? Info about the system: $ mdadm --version mdadm - v3. As mentioned above, this guide will cover RAID array management. mdadm --grow --raid-devices=11 /dev/md0 which reported an issue with the size. 5. My mdadm RAID5 array just underwent a 5>8 disk grow and reshape. *가격이 비싸다. Obviously you should back up your data, but in my case backing up 6TB isn't really feasible. The essence of this May 12, 2023 · Grow (or shrink) an array, or otherwise reshape it in some way. conf man page - see option bitmap; Comments: IMO, bitmaps are perhaps primarily of interest for RAID levels 5 and 6, since these have the slowest rebuilds. To add to my woes, one of the drives failed a smart test and has read errors. Sep 5, 2018 · instead of adding my 2 new disks to my raid 5 array via cli, using the following command as shown in the guide. 1 or 1. 0 ( but not 1. 46 GB) Raid Devices : 7 Total Devices : 7 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Fri Apr 2 14:46:52 2021 State : Jan 10, 2023 · I cannot stop the raid or the reshaping. The whole process was hung so I had to reboot the machine. Unfortunately, I think you going to have to let this complete and then go through the produce of reducing the array back May 14, 2020 · Personally I would just leave it, but it's been a while since I tried a reshape on a mdadm array, so I don't know if it'll handle cancelling it and restarting it. I suspect this comes from /etc/default/mdadm, which includes: # AUTOCHECK: # should mdadm run periodic redundancy checks over your arrays? See # /etc/cron. : Reshape from 4-disk RAID5 to 5-disk RAID6) mdadm --grow /dev/md0 --level=6 --raid-disk=5 Do not specify the option --backup-file; The reasoning which he details in Dec 6, 2021 · I've got a software RAID setup using mdadm on a fully updated Ubuntu 20. Noted that mdadm must fix --revert-shape as well, and Aug 17, 2016 · Prerequisites. The commands would be: mdadm --manage /dev/mdX --fail /dev/sdX; mdadm --manage /dev/mdX --remove /dev/sdX; If any of the commands fail maybe try with a -f at the end to force it. Feb 11, 2013 · The summary is that during a reshape of a raid6 on an up to date CentOS 6. Default is to use /etc/mdadm/mdadm. When array under reshape is assembled during initrd phase, this option mdadm--stop--scan This will shut down all arrays that can be shut down (i. mdadm: Invokes the RAID management tool. mdadm will state that you need a spare drive to avoid a degraded array. 3. I instead used the gui and used the grow button on the raid array which I assume makes them functioning members of the raid instead of spares. But their data layout is regarded to make sense. This variable is intended primarily for debugging mdadm/mdmon. Read speed is more than enough - 268 Mb/s in dd. Superblock 1. So I partitioned and readded the disk. Power down the array disks. To recover from this, you first confirm your backups are good. 78 GiB 4000. You have to let it finish. # mdadm --stop --scan . Nov 25, 2024 · This option is complementary to the --freeze-reshape option for assembly. 3) a reshape can move the data_offset at the same time so that it is only ever writing to an unused area of the devices. umount mounted mdadm --stop /dev/md/test Jan 16, 2025 · So, I'd like to know, is is possible to do the following with mdadm: I start with RAID0 configuration on 2 disks: sda and sdb. This allows multiple devices (typically disk drives or partitions thereof) to be combined into a --freeze-reshape Option is intended to be used in start-up scripts during initrd boot phase. conf. /dev/md0: Identifies the specific RAID array that is to be stopped. It's simply stuck. are not currently in use). Mar 23, 2022 · I've 24 disks connected from a target to my Ubuntu . conf # # Please refer to mdadm. Jul 30, 2024 · I t is no secret that I am a pretty big fan of excellent Linux Software RAID. Mar 8, 2009 · Mdadm is the modern tool most Linux distributions use these days to manage software RAID arrays; in the past raidtools was the tool we have used for this. When array under reshape is assembled during initrd phase, this option stops mdadm--stop--scan This will shut down all arrays that can be shut down (i. Currently supported growth options include changing the active size of component devices and changing the number of active devices in RAID levels 1/4/5/6, as well as adding or removing a write-intent bitmap. It writes for 0. Creating, assembling and rebuilding small array is fine. It's a re-occuring issue on the linux-raid mailing list. Jul 26, 2019 · System: Synology DiskStation 1819+ with DSM 6. The array will begin to recover by copying data to the new drive. I have a 2 disk raid5 (clean state) which I want to reshape into a 4 disk raid6. Since it is best practice Do i need to reshape the array first to an array with one disk less or is it enough to remove the drive, Previously, when the mdadm utility was used to reshape RAID0 and RAID5 volumes created with the Intel Matrix Storage Manager (IMSM) utility, a race condition between the mdadm and mdmon utilities occurred. Normally, I would simply remove the drive from the array, replace the drive, and rebuild. alternatively, specify devices to scan, using # wildcards if desired. a request to stop reshape just like -fail is to make a drive failed. The order you did is correct for enlarging a filesystem, but backwards for shrinking one. I just realized something re-reading my writeup: all my mdadm commands ran non-stop: reshape of md2, i immediately enqueued reshape of md3, then once md2 was done, I immediately enqueued increase of the number of devices on md2, and then same for md3), so DSM never had a Grow (or shrink) an array, or otherwise reshape it in some way. --stop: Commands the system to stop the specified RAID device. I'd like to get rid of that 'removed' and activate spare. Although, it can max upto 200K, but as min value is too low, mdadm always tries to keep the value below average to your speed available. You forgot the * for the examine (should be on the actual raid members i. 29 GiB 7992. 5s, then stop etc. I had a power failure while a raid6 array was being reshaped, and now certain operations cannot be run against it, including mounting or mdadm --examine. 0-17-generic Makefile to reproduce the problem: Jan 16, 2025 · run watch cat /proc/mdstat and keep an eye on it until there's no resync or reshape activity. mdadm --assemble /dev/md0 /dev/sd[abcdf] it came back up and restarted along its reshape process, but with only 4 discs. Nov 16, 2024 · Is it possible to stop/pause the mdadm grow process? Can I stop/abort the reshape process, and run with bitmaps? I used this doc to improve speeds but it didn't do all that much since most of the speed would come from enabling Mar 7, 2015 · These are the changes I have found that speed up the reshape process. This allows multiple devices (typically disk drives or partitions thereof) Oct 22, 2016 · stop the array then mdadm --assemble --update=revert-reshape (or was it reshape-revert?) Do you have any security shenanigans? apparmor, selinux, systemd? they sometimes tend to mess with mdadm reshape. Now to stop the array and restart it , I'm following below steps: mdadm --stop device mdadm --create . mdadm --assemble --scan Jan 15, 2016 · However, as I said at the end of my first post, I had a power failure during the reshape (Murrrphyyyyyyy), but thanks to that I can confirm that it's safe to stop a reshape. I assumed if I reboot the computer, the problem would be solved, but after reboot I am in a Jul 14, 2020 · You all are such a fantastic community, and I don't know where else to ask for help. You probably have to remove the metadata Contribute to neilbrown/mdadm development by creating an account on GitHub such as add,remove,fail report on or modify various md related devices. Follow our guide on how to create RAID arrays with mdadm on Ubuntu 16. (and a --continue option to resume it at a later time) I don't know whether arch mkinitcpio is making use of those options somehow. cat /proc/mdstat Superblock is persistent Update Time : Tue Dec 3 08:34:44 2013 State : active, FAILED, reshaping Active Devices : 5 Working Devices : 5 Failed Devices : 4 Spare Devices remove partitions that are marked as "faulty spare rebuilding Sep 2, 2019 · After a dozen of hours waiting for my array reshape to move on I think it's finally the right time to ask you for some advice. Currently supported growth options including changing the active size of component devices and changing the number of active devices in Linear and RAID levels 0/1/4/5/6, changing the RAID mdadm --stop --scan This will shut down all arrays that can be shut down Jan 15, 2025 · Just an addition to the solution that I found after I experienced the same issue. Jan 16, 2017 · I had a working RAID5 array consisting of 6 4TB disks. It goes without saying that you should back up data before doing anything, otherwise you accept the risk of losing it all. When --stop option is used with --scan option, it shut down all arrays that can be shut down (i. 66 TiB 48. May 11, 2015 · Yes, you need to stop the array before removing the disks. Assemble and start all arrays listed in the standard config file. (the same command which I used to create the array at first) Aug 20, 2020 · With "--force", we can assemble the array even if some superblocks appear out-of-date. I have tried starting the array in readonly mode. mdadm--create--help Provide help about the Create mode. If you ever end up with a similar need, here is how I did it. 04 to create one or more arrays before starting May 28, 2016 · mdadm sure must have noticed the faulty bits by now, but for some reason did not write the repaired chunk back to disk. 2-24922. mdadm now has the option to reduce arrays and remove drives, you just need to do it in the right order. Jul 26, 2024 · Check dmesg, smartctl -a, etc. 28 GB) Array Size : 39064686592 (37254. I even rebooted the server How can I recover from this? Code. I thought. ; Right now I see only one option - I stop the array, copy sdb to sdc with dd or any other block-copy tool and start the array back. ; Look in /dev/mapper/. I built the array # mdadm --create --verbose /dev/md0 --level=5 --raid-devices=2 /dev/sdc1 /dev/sdb1 mdadm: layout defaults to left-symmetric mdadm: layout defaults to left-symmetric mdadm: chunk size defaults to 512K mdadm: size set to 2900832256K mdadm: automatically enabling write-intent bitmap on large Sep 13, 2011 · While researching this problem I managed to find a script for tuning mdadm RAIDs that provided a reasonable improvement. I found several To help prevent accidents, mdadm requires that the size of the array be decreased first with mdadm --grow --array-size. 2 Creation Time : Sun Nov 4 19:35:34 2018 Raid Level : raid5 Array Size : 14650698240 (13971. Dec 26, 2024 · Whenever i assemble the drive the reshape speed starts at 2245k/sec and slowly slows to 0k/sec. MDADM_NO_UDEV Normally, mdadm does not create any device nodes in /dev, mdadm--incremental--rebuild--run--scan Rebuild the array map from any current arrays, and then start any that can be started. Jan 16, 2025 · This may sound silly, but is there a way to intentionally reduce the speed of a rebuild in a Linux Software RAID? (Basically reducing the throughput of all of the disks so that it's not maxing out. I used esoteric to mean not routinely used or cannot be With newer kernels (v3. 88 GiB 12000. You Jan 7, 2018 · Can i somehow pause the reshape, turn of the computer and the resume it once it has been turned on again? You can safely shutdown the computer and the process will Aug 24, 2024 · I don't believe there is any safe way to cancel a reshape. Currently supported growth options including changing the active size of component devices and changing the number of active devices in Linear and RAID levels 0/1/4/5/6, changing the RAID mdadm --stop --scan This will shut down all arrays that can be shut down Jan 15, 2025 · mdadm --stop /dev/md0 Then try to reassemble the array manually: mdadm --assemble --force /dev/md0 /dev/sdb1 /dev/sdd1 /dev/sde1 /dev/sdf1 Check the status of the array, to examine if the drive list/structure is OK (bottom of command output will show which drive is at what status and at which position in the array): Jul 15, 2014 · When I try to stop the array this is what I get: mdadm: Cannot get exclusive access to /dev/md2:Perhaps a running process, mounted filesystem or active volume group? It gave me trouble to unmount the (empty, unused) file system but was able to use umount -l. e. To complete this guide, you will need access to a non-root sudo user. I followed dSebastien's blog post on how to re-create the array:. You can delete it manually. The key points relevant here are as Sep 8, 2017 · You got the order backwards. However these drives had Jan 15, 2023 · Reshape pos deviates by ~3GiB, not sure where mdadm would resume by default if you could force reassembling it. 2-4) unstable; urgency=medium * QA upload [ Debian Janitor ] * Remove constraints unnecessary since buster * Add missing ${misc:Depends} to Depends for mdadm-udeb. I found that that method of recreating the array worked better than this above method. 2 Creation Time : Tue Jun 1 17:25:18 2021 Raid Level : raid5 Array Size : 46883175936 (43. This allows multiple devices (typically disk drives or partitions thereof) to be combined into a May 18, 2012 · mdadm: Need to backup 7168K of critical section. In his blog, Neil Brown, the lead architect and developer of mdadm, discusses mdadm's current capabilities to reshape arrays and change raid levels. MDADM_NO_UDEV Normally, mdadm does not create any device nodes in /dev, but leaves that task to udev. 1 Mb/s. --freeze-reshape This option is intended to be used in start-up scripts during the initrd boot phase. It wouldn't boot normally, hanging on looking at md2, so I had to go in to recovery mode and was able to resume the reshape. I would suspect hardware read failure here, but you said that these are the easystores and those support TLER, which I would assume you'd also see propagated through dmesg or could otherwise inspect Jan 15, 2025 · It depends. sudo mdadm --stop /dev/mdX Replace /dev/mdX with the appropriate RAID device identifier. This allows multiple devices (typically disk drives or partitions thereof) to be combined into a mdadm (4. Identifying the Issue. This will prevent any changes from being made to the RAID array while you are migrating. Aug 1, 2021 · Guide on removing a Linux mdadm RAID1 array while preserving existing partition data, avoiding the need to reinstall or copy files around. Long story short, turns out this server has an actual RAID controller, so a hardware raid would be more preferable than the software raid. You can also reshape the array so that it is only supposed to have one disk instead of two and then it won't Jan 16, 2025 · I investigated the binary format of the MD superblock, and found that there was a section with reshaping status, telling me that about 1. I managed to "stop" the failing re-shape with: mdadm /dev/md127 --fail /dev/sdh1 # Then i just shutdown -h now and swap the cable # When it came back up mdadm /dev/md127 --add /dev/sdh1. 4. Oct 27, 2023 · To save your changes and exit vim – :wq! and press “Enter ” to confirm. Since Sep 2, 2018 · I have a somewhat non-standard mdadm reshape going on. mdadm: hot removed /dev/sdc from /dev/md0. The only difference between the first command and the second command, aside from --force is the --continue. When the array under mdadm--stop--scan This will shut down all arrays that can be shut down (i. mdadm -A --update=devicesize /dev/mdX This will update the component devices to use the minimum size of the components. Setting this value to 1 will prevent mdadm from automatically launching mdmon. For what it's worth, after adding the 10th disk and restarting the reshape/grow operation from 9 to 10, I was getting 9 MBps this time instead of the 6-7 MBps I got when Welcome to LinuxQuestions. The current raid level from mdadm says it's raid6, but the newly added sdh1 is listed as a spare. The recently added drive (sdf) is writting fitfully. Run the following command: sudo mdadm --detail /dev/mdX Jun 7, 2015 · And the same if I try to stop the array # mdadm -S /dev/md0 I have also tried growing it down to 3 devices again but it is busy with the last reshape: # mdadm --grow /dev/md0 --raid-devices=3 mdadm: /dev/md0 is performing resync/recovery and cannot be reshaped I tried to mark the new drive as faulty to see if the reshape would stop but to no avail. mdadm --stop /dev/mdX and then force assemble it with. 00 TB) Raid Devices : 4 Total Devices : 5 Persistence : Superblock is persistent Update Time : Fri Oct 15 15:42:47 2021 State : clean, reshaping Active Devices : 4 Working Devices : 5 Failed Jan 16, 2025 · Reshape the array ; Shrink the logical volume md0; This seems like a very time consuming process. mdadm - Oct 21, 2022 · Things to keep in mind: The amount of capacity reduction for the array is defined by the number of data copies you choose to keep. However, when I try to remove the drive, I get an error: # mdadm /dev/md127 --remove /dev/sdg mdadm: hot remove failed for /dev/sdg: Device or resource busy I have done a fair amount of googling, Jan 15, 2025 · #mdadm --stop /dev/md3 You'd better make a backup of the partition table - just to make sure. 8 TB was already reshaped into RAID5, when 1 device was added. I thought I'd share the details here in case anyone else finds it useful. Currently supported growth options including changing the active size of component devices and changing the number of active devices in Linear and RAID levels 0/1/4/5/6, changing the RAID mdadm --stop --scan This will shut down all arrays that can be shut down Nov 24, 2020 · I would be curious to hear back from you at the end of the process. Using the --force will allow you to continue without a spare. Ubuntu Forums > The Ubuntu Forum Community > Ubuntu Specialised Support > Reshape Status : 71% complete Delta Devices : 1, (4->5) UUID : e509485d:97ef7ead:d14ee5ec:eb91e22c (local to host us104) Events : 0. You can then replace it with a new drive, using the same mdadm --add command that we demonstrated above. 65 GiB 3996. By default, two copies of each data block will be stored in what is called the near layout. Oct 15, 2021 · /dev/md1: Version : 1. 2 Creation Time : Fri Aug 29 21:13:52 2014 Raid Level : raid5 Array Size : 3906764800 (3725. But the raid array wont start. Jan 15, 2025 · If you're using LVM on top of mdadm, sometimes LVM will not delete the Device Mapper devices when deactivating the volume group. You never want to see that message. Jun 16, 2021 · According to How to remove a drive from a non-standard 2-drive RAID 5 array?, "with mdadm, a 2 drive RAID 5 is binary identical to a RAID1". Aug 3, 2021 · Grow (or shrink) an array, or otherwise reshape it in some way. 6_amd64 NAME mdadm - manage MD devices aka Linux Software RAID SYNOPSIS mdadm [mode] <raiddevice> [options] <component-devices> DESCRIPTION RAID devices are virtual devices created from two or more real block devices. Jan 20, 2023 · A bit of history to start with. 5s, then stop, then writes for 0. At the restart the raid is showing as "State : clean" but it is not resuming the reshape. 3-1ubuntu2. One potential problem I can see is that I used the full disk when adding the new drives (e. . When cat /proc/mdstat said it was complete I rebooted the system and now the array no longer shows. Explanation: sudo: Grants the necessary administrative permissions. 2 worked for me) then first stop the array via mdadm -S /dev/mdX and then reassemble it:. 24 GB) Used Dev Size remove all references to the disk array, mdadm --grow /dev/md1 --array-size 5G If the status of the array is something like: reshape = 0% speed=0K/sec. Side Note: If you are having this issue Nov 17, 2024 · I was adding an additional new drive to 4 drive raid 5 mdadm array. Jan 30, 2023 · Edit: Once the reshape finished the drive became fully accessible again. sd[bcdef]1) May 12, 2023 · Grow (or shrink) an array, or otherwise reshape it in some way. To speed up, we would like to maximize these numbers. Jan 16, 2025 · I'm currently rebuilding a RAID6 MDADM array from 5 devices to 9. Improve SIGTERM handling during reshape, from Mateusz Kusiak. Jan 5, 2025 · Reducing raid 5 disks with mdadm. #2 ) S/W Raid*디스크 구매 비용외에는 비용이 없다. It is recommended to re Aug 20, 2020 · From: BingJing Chang <bingjingc@xxxxxxxxxxxx> With "--force", we can assemble the array even if some superblocks appear out-of-date. To change the numbers, you may run something like the following: Dec 13, 2024 · Pass mdadm environment flags to systemd-env to enable tests from Mateusz Kusiak. 40 GiB 3000. 9, or 1. But no errors in "syslog" in OMV. conf, or if that is missing, then /etc/mdadm. References: HowTo: Speed Up Linux Software Raid Building And Re-syncing; mdadm man page - see flag -b, --bitmap= mdadm. Increasing the number of RAID devices (e. 2 “fstab” editing with nano editor. 18 GB) Used Dev Size : 3902430208 (3721. 37 box running software RAID (everything controlled by mdadm). The reshape is apparently supposed to take 7. Now your array will be automatically built when you reboot your operating system. mitgt wseofl fyoic cvtr kqjcz neftsk ijm csj lnm vhzabd