Hi,
I have a a few two-disk RAID1 partitions that I'd like to convert to
three-disk RAID5 partitions using fedora15 with ext4. I've read a few
docs online, but none that are authoritative or current. Some even say
to zero the superblock first, which doesn't sound safe at all.
The partitions were created using v1.0 with mdadm-3.2.2:
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.0
Creation Time : Sat Jan 1 13:07:37 2011
Raid Level : raid1
Array Size : 511988 (500.07 MiB 524.28 MB)
Used Dev Size : 511988 (500.07 MiB 524.28 MB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sat Sep 10 23:11:23 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : localhost.localdomain:0
UUID : a7af0eec:2bf1bb46:a6afa7a4:6e61d731
Events : 181
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
I've read the man page, and it seems to indicate to use the --grow
option, but it's still a little unclear. I've read that the arrays
should be stopped first, but the man page seems to indicate it should
be performed on a running array.
Is the general process to first convert the RAID1 to a two-disk RAID5,
then --add the third disk?
Thanks,
Alex
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