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Hi Folks,
I've been running a 1TB RAID1 array for a good few months without issue and have never seen the mdo_resync and md0_raid1 processes running before. Does this indicate a problem and if so, how can I diagnose it?
I'd previously booted with a kernel panic. I then rebooted and fsck'd all my drives, rebooted again and here we are.
Personalities : [raid1]
md0 : active raid1 sda1[0] sdd1[1]
974430016 blocks super 1.2 [2/2] [UU]
[=====>...............] resync = 28.2% (275412416/974430016) finish=107.1min speed=108684K/sec
unused devices: <none>
/dev/md0:
Version : 1.2
Creation Time : Tue Oct 16 12:36:41 2012
Raid Level : raid1
Array Size : 974430016 (929.29 GiB 997.82 GB)
Used Dev Size : 974430016 (929.29 GiB 997.82 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Thu Jan 10 17:43:15 2013
State : active, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Resync Status : 28% complete
Name : arch64:0 (local to host arch64)
UUID : 0930e707:614de0a3:3f4f73ee:a04f940f
Events : 250
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 49 1 active sync /dev/sdd1
/dev/sda1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 0930e707:614de0a3:3f4f73ee:a04f940f
Name : arch64:0 (local to host arch64)
Creation Time : Tue Oct 16 12:36:41 2012
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 1948860416 (929.29 GiB 997.82 GB)
Array Size : 974430016 (929.29 GiB 997.82 GB)
Used Dev Size : 1948860032 (929.29 GiB 997.82 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : active
Device UUID : 5f7bd68e:c7f4fa8c:726e9cb0:e2f4686e
Update Time : Thu Jan 10 17:43:15 2013
Checksum : aff3a99f - correct
Events : 250
Device Role : Active device 0
Array State : AA ('A' == active, '.' == missing)
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 0930e707:614de0a3:3f4f73ee:a04f940f
Name : arch64:0 (local to host arch64)
Creation Time : Tue Oct 16 12:36:41 2012
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 1948860416 (929.29 GiB 997.82 GB)
Array Size : 974430016 (929.29 GiB 997.82 GB)
Used Dev Size : 1948860032 (929.29 GiB 997.82 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : active
Device UUID : 3bb7c5cf:2f34c77e:c45ffedf:74c8c5ee
Update Time : Thu Jan 10 17:43:15 2013
Checksum : 926de9c9 - correct
Events : 250
Device Role : Active device 1
Array State : AA ('A' == active, '.' == missing)
Please advise!
Last edited by fabertawe (2013-01-10 20:02:36)
Ryzen 9 5950X, X570S Aorus Pro AX, RX 6600, Arch x86_64
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resync != rebuild
I wondered about the same thing once after I had to do a hard reset. resync just checks if the RAID data is still consistent, so it's basically a "RAID fsck".
In other words, usually nothing to worry about...
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Thanks 65kid.
So what's triggering this resync? I can't find anything under /etc/cron* or /etc/systemd.
Edit: Is this applicable?
Jan 10 17:01:48 arch64 systemd[1]: Unmounting /media/Array...
Jan 10 17:01:48 arch64 umount[1078]: umount: /media/Array: target is busy.
Jan 10 17:01:48 arch64 umount[1078]: (In some cases useful info about processes that use
Jan 10 17:01:48 arch64 umount[1078]: the device is found by lsof(8) or fuser(1))
Jan 10 17:01:48 arch64 systemd[1]: media-Array.mount mount process exited, code=exited status=32
Jan 10 17:01:48 arch64 systemd[1]: Failed unmounting /media/Array.
...
Jan 10 17:01:48 arch64 systemd[1]: Unit media-Array.mount entered failed state
Last edited by fabertawe (2013-01-10 19:43:41)
Ryzen 9 5950X, X570S Aorus Pro AX, RX 6600, Arch x86_64
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You said it yourself, you had a kernel panic, so the RAID was not cleanly shut down. This forces a resync on the next boot.
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I'm positive I've had other unclean shutdowns whilst running this array and not seen this resyncing before. I'll take your word for it though, it does make sense.
I've not noticed this before but it seems I've been getting the "Failed unmounting /media/Array" mentioned previously at every shutdown!
Ryzen 9 5950X, X570S Aorus Pro AX, RX 6600, Arch x86_64
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