Hi Ken,

I wasn't able to boot from degraded array after running "/sbin/mdadm
--assemble --scan" in few cases when I had other disks in my computer.
If I disconneted the disks and attached just the working one, system
booted without a problem in degraded mode (after running the command
mentioned above). I think the reason is that mdadm scans for any RAID
devices by their signatures on the disk (because there is no
/etc/raidtab accessible) and maybe it finds the singatures in different
order each time.

There is also "--run" parameter in mdadm which can help assembling RAID
in degraded mode.

Sorry for non-detailed description but I currently don't have the
computer with Ubuntu+RAID1 physically with me so I can't do the tests.

Jan

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cannot boot raid1 with only one disk
https://bugs.launchpad.net/bugs/120375
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