Not knowing what I was doing, I created a RAID1 with a single drive and
a spare, as below.
I'd like to add the spare to the array. How do I do this without rebooting?
Cheers,
Dave
# definitions of existing MD arrays
ARRAY /dev/md0 level=raid1 num-devices=1
UUID=9921faab:5d93510e:0db287f1:dc103b07
spares=1
# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Fri Jul 18 14:57:40 2008
Raid Level : raid1
Array Size : 104320 (101.89 MiB 106.82 MB)
Used Dev Size : 104320 (101.89 MiB 106.82 MB)
Raid Devices : 1
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Feb 15 03:37:11 2012
State : clean
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
UUID : 9921faab:5d93510e:0db287f1:dc103b07
Events : 0.218
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 - spare /dev/sdb1
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