This bug was fixed in the package mdadm - 3.3-2ubuntu7.2
---------------
mdadm (3.3-2ubuntu7.2) xenial; urgency=medium
* Backport initramfs changes from 3.4-4, to improve reliability of
booting with degraded arrays. LP: #1635049
* debian/initramfs/hook:
- Fix UUID= grep for configured RAIDs to be case insensitive.
- Drop CREATE stanzas from mkconf and don't include them in the
initramfs. The generated defaults, are the compiled-in defaults. And
the current one generates warnings when running mdadm in the
initramfs, as there is no passwd|group files to resolve root/disk
uid/gid.
* debian/initrmafs/script.local-block|script.local-bottom:
- Use local-block integration scrips, in favor of root-fail hooks to
activate incomplete arrays.
* debian/initramfs/init-premount|mdadm-functions:
- Drop, no longer in use.
-- Dimitri John Ledkov <x...@ubuntu.com> Mon, 20 Feb 2017 10:57:43
+0000
** Changed in: mdadm (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1635049
Title:
Boot fails with degraded mdadm raid
Status in mdadm package in Ubuntu:
Fix Released
Status in mdadm source package in Xenial:
Fix Released
Status in mdadm package in Debian:
Fix Released
Bug description:
[Impact]
* Systems fail to boot in certain status of mdadm arrays, requiring
manual recovery / array assembly
* Backport of boot logic from yakkety
[Test Case]
* Install a system with RAID1 and two hard-drives and boot the system with
array in-sync
* Shutdown
* Disconnect one of the drives and thus boot, unexpectedly, degraded
* The boot should complete.
* Shutdown, and boot again, expecting degraded state.
* The boot should complete.
* Shutdown, reconnect disconnected drive, and boot again.
* The boot should complete, add the device to the array, the array should be
resyncing, and results with system with array in-sync, just like at the
beginning of the testcase.
[Regression Potential]
* Systems may continue to fail to boot degraded.
[Other Info]
* Original report
mdadm does not attempt to start partial md devices (incremental
assembly) during initramfs and can cause system to fail to initramfs
prompt if rootfs on md.
http://askubuntu.com/questions/789953/how-to-enable-degraded-raid1
-boot-in-16-04lts
Fixed in debian mdadm 3.4-2: https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=784070
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1635049/+subscriptions
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