Public bug reported:
[Impact]
* In xenial, mdadm-waitclean is an init.d script, and it appears that
it doesn't not run late enough. In later releases a systemd-shutdown
script is shipped instead. Which results in wait-clean action executed
later in the shutdown cycle, having more chances to complete the
shutdown with clean/synced RAID array state.
* In xenial, there is no default shutdown initramfs, and therefore
mdmon processes are killed before the Intel Matrix RAID / DFF external
metadata RAID arrays are stopped. This leads to a full resync upon next
assembly. One options is to implement a shutdown initramfs, another
solution is to not takeover mdmon process from the initramfs. This will
result in holding up initramfs memory throughout the lifetime of the
system, however the net effect should be clean raid array shutdowns
which will mitigate excessive resyncs.
[Bugfix]
Backport mdadm.shutdown systemd-shutdown script to xenial
[Test Case]
* Switch logging to console, and make it verbose LogLevel=debug
LogTarget=console. Perform shutdown and observe that mdadm.shutdown is executed
during shutdown.
* Check that the system boots with a clean raid-array state.
[Regression Potential]
* On systems that have rootfs on the Intel Matrix / DDF raid (external
metadata mdadm raid, i.e. NOT the generic linux raid) initramfs will result in
being held up through the lifetime of the boot thus using more steady state
RAM. This only affects systems that use Intel Matrix / DDF controllers, and are
typically bare-metal servers.
* additional wait-clean shutdown script is quick but has an impact on
shutdown.target speed / time to shutdown or reboot.
[Other Info]
* Later releases do not use sysv-init script thus this not a direct backport
of code from later releases
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
** Affects: mdadm (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: mdadm (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1722491
Title:
improve mdadm imsm integration with systemd
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