** Changed in: mdadm (Ubuntu Zesty)
Status: Fix Committed => Won't Fix
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https://bugs.launchpad.net/bugs/1608495
Title:
IMSM fakeraid handled by mdadm: unclean mounted volumes on
shutdown/reboot
Status in mdadm package in Ubuntu:
Fix Committed
Status in mdadm source package in Xenial:
Fix Committed
Status in mdadm source package in Yakkety:
Won't Fix
Status in mdadm source package in Zesty:
Won't Fix
Bug description:
Opening this report for Xenial and later as this problem does surface
again due to moving to systemd.
Background:
mdadm is used to create md raid volumes based on Intel Matrix Storage
Manager fakeraid metadata. The setup usually consists of a container
set that contains one or more raid volumes. Which is the reason that
those fakeraid volume are more affected by timing issues on
shutdown/reboot.
In my specific setup I am using one of the IMSM raid volumes as a LVM
PV and one LV of that is mounted as /home. The problem is that
unmounting /home on shutdown/reboot will update the filesystem
superblock which causes the raid state to become dirty for a small
period of time. For that reason with sysvinit scripts there is a
mdadm-waitidle script which *must* be run after the umountroot (or for
/home at least after umountfs) script has run.
With Xenial both umountroot and umountfs are softlinks to /dev/null in
/lib/systemd/system, so I am not sure they are good to cause the mdadm-waitidle
to be delayed *after* all filesystems are unmounted.
Practically I see that if /home is mounted on shutdown/reboot, the raid set
will go into a full resync the next time I boot (additional pain but different
problem: the resync appears to be much more aggressive than in the past,
delaying boot a lot and rendering the system barely usable until it finishes).
If I manually unmount /home before the reboot, the raid set is good.
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