Well, raidreconfig worked wonderfully for me, however I screwed up
afterwards. I fscked before resize2fs, but forgot to do it again afterwards
and mounted the filesystem and used it. That caused it enough damage that I
damaged it and rebuilt it from backups. Raidreconfig worked excellently. It
handled unequal partition sizes just fine, though running it with the --test
flag returned an error that one partition was too small (0kb).
One feature request:
Go from 4 40gb disks in RAID 5 to 3 80gb devices in RAID 5: 1 80 gb disk and
the 4 40gb drives in RAID 0.
Old raidtab:
raiddev /dev/md0
raid-level 0
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda4
raid-disk 0
device /dev/hdc1
raid-disk 1
New raidtab:
raiddev /dev/md0
raid-level 5
nr-raid-disks 4
chunk-size 128k
persistent-superblock 1
parity-algorithm left-symmetric
nr-spare-disks 0
device /dev/hda4
raid-disk 0
device /dev/hdb1
raid-disk 1
device /dev/hdc1
raid-disk 2
device /dev/hdd1
raid-disk 3
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