I can confirm this affected me as well. My RAID-10 is on a separate
filesystem from the Operating System's SSD -- I have the RAID-10 mounted
at '/raid10' on my server. My application is installed on the non-mdadm
SSD at '/opt' but it reads/writes/executes files from the '/raid10'
filesystem (made up of 6x8TB drives with 1 spare).
During a recovery from a failed drive, it would periodically run into
the same issue mentioned here while performing write operations and was
less likely to occur during read operations but it still did happen. I
noticed I'd have to reboot about every 30-60min due to this hang-up that
stopped the rebuild from continuing -- once the server was back online,
it would continue.
However, I got fed up with this because the rebuild/resync is supposed
to take approximately 9ish hours and it was only 29% complete so on the
last reboot I stopped my application and unmounted the RAID-10 (umount
/raid10). Once I did that, this continue rebuilding through the night
without issue and completed the remaining 71%.
... So it seems like you shouldn't interact with the RAID in the latest
kernel/xfs/mdadm on Ubuntu 18.04. Here's the current versions I'm
running:
==========
root@server:~# uname -r
4.15.0-36-generic
root@server:~# dpkg -l | awk '/mdadm/ || /xfsprog/ {print $2,$3}' | column -t
mdadm 4.1~rc1-3~ubuntu18.04.1
xfsprogs 4.9.0+nmu1ubuntu2
==========
Previously with Ubuntu 16.04 with the 4.4 kernel and latest
mdadm/xfsprogs for 16.04 I didn't have this issue.
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https://bugs.launchpad.net/bugs/1767992
Title:
Linux md raid-10 freezes during resync
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