I don't think any such feature has been added. I certainly can't find
it anywhere. Can you post a screen shot? What normally happens if you
don't use the degraded boot argument is that the array will fail to
activate. If you have filesystems that can't be mounted at boot, the
system asks if you want to continue booting or not, but if your root
filesystem is the one that can't be accessed, then you can't actually
continue. Is your /etc/fstab pointing to the filesystem by its UUID or
the /dev/mapper/xxx device? If it is the raw device, that would explain
the system telling you it can't be mounted and not being able to
continue.
Just to make sure, I reproduced a mirrored setup in a VM and booted
without one of the disks and the system booted right up off the
underlying regular disk, bypassing the dmraid since it failed to
activate, and the root fs UUID could be seen on the normal disk.
** Changed in: dmraid (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/872220
Title:
Fails to boot when there's problems with softraid
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