Hello!
I run centos 6.4/x86-64 server with intel 82801 and raid1.
mdstat looked like this:
md127 : active raid1 sda[1] sdb[0]
41943040 blocks super external:/md0/0 [2/2] [UU]
md0 : inactive sdb[1](S) sda[0](S)
6306 blocks super external:imsm
Today I added spare- /dev/sdc, I executed
mdadm -a /dev/md0 /dev/sdc
according to
http://download.intel.com/support/chipsets/rste/sb/intelr_rste_linux.pdf
and got something like this ( this is from above pdf):
md0: inactive sdc[2](S) sdb[1](S) sda[0](S)
3315 blocks super external:imsm
Then I rebooted server and there is info from bios during boot that 2 drives are in array and 1 drive is spare.
Looks good.
But when I look into mdstat I see:
cat /proc/mdstat
Personalities : [raid1]
md126 : inactive sdc[0](S)
1105 blocks super external:imsm
md127 : active raid1 sda[1] sdb[0]
41943040 blocks super external:/md0/0 [2/2] [UU]
md0 : inactive sdb[1](S) sda[0](S)
6306 blocks super external:imsm
unused devices: <none>
Looks like another array was created and no spare.
Is this OK or I missed something?
Thank you!