Having a problem changing my number of mirrors on a raid1 from 3 to 2.
Did it about a week ago on another system so I'm a bit perplexed.
mdadm --grow /dev/md0 --raid-disks 2
mdadm: Cannot set device size/shape for /dev/md0: Device or resource busy
cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0] hda1[2]
976640 blocks [3/2] [U_U]
mdadm -E /dev/md0
mdadm: No super block found on /dev/md0 (Expected magic a92b4efc, got
aaaaaaaa)
debiantest:~# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Mon Dec 6 13:59:46 2004
Raid Level : raid1
Array Size : 976640 (953.75 MiB 1000.08 MB)
Device Size : 976640 (953.75 MiB 1000.08 MB)
Raid Devices : 3
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Tue May 10 13:23:29 2005
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 223c18cc:247c58f8:0d9b9e90:25271587
Events : 0.950834
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 0 0 - removed
2 3 1 2 active sync /dev/hda1
Debian Sarge
mdadm -V
mdadm - v1.9.0 - 04 February 2005
John
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