Red Hat Bugzilla – Bug 465545
problems with md raid1 v1.0 with bitmaps
Last modified: 2009-12-18 01:29:56 EST
I played a bit with md raid metadata versions other than the default 0.90, expecting them to be stable and beneficial already. How wrong I was :-)
First issue I ran into was that activated spare members of raid 1 never became fully active, even after syncing completed. I.e., their metadata still didn't show them as active, and they were still numbered above the 0..N-1 range used by active members. This was in spite of leaving them alone after syncing completed.
With udev-based progressive bringing up of raid devices, which often causes partial arrays to be brought up and missing devices to be completed later, most components end up in this limbo state.
Another problem I noticed had to do with saving bitmaps beore hibernation. It just so happened that the raid 1 device containing the only physical volume of the volume group containing both the swap/suspend device and the root filesystem had bitmaps saved incorrectly or some such before hibernation, which prevented it from being brought up at all. The kernel reported a failure to load up the bitmaps, and completely failed to bring the array up.
Since I went back to v0.90 metadata, I didn't experience this kind of problem, so this might be 1.x-only.
The work around to bring the system back up was to boot in rescue mode and zero out the superblock of the out-of-sync device. (Actually, I just created a new array out of the same partitions). It was fun to watch it come up from hibernation afterwards :-)
Can you report these problems upstream?
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.
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