Hi
I have a 4-device RAID1 set (with one device missing), which I want to
bring down to two active devices and a spare.
When I try to do so with the latest mdadm on my current kernel, it fails
simply with "mdadm: failed to set raid disks".
root@zotac:~# mdadm /dev/md0 --grow --raid-devices=2
mdadm: failed to set raid disks
root@zotac:~# mdadm /dev/md0 --grow --raid-devices=2 -x 1
mdadm: option -x not valid in grow mode
root@zotac:~# mdadm -V
mdadm - v3.2.3 - 23rd December 2011
root@zotac:~# uname -a
Linux zotac 2.6.35-32-generic #64-Ubuntu SMP Tue Jan 3 00:47:07 UTC 2012
x86_64 GNU/Linux
root@zotac:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sdb3[3] sde2[2] sdd2[0]
487861824 blocks [4/3] [U_UU]
md0 : active raid1 sdb2[3] sde1[2] sdd1[0]
521984 blocks [4/3] [U_UU]
unused devices: <none>
Is it possible to do this without taking the array offline?
Thank you.
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