This is the /proc/mdstat output on a particular kernel 2.0.36 +
raid0145-19990421 system equipped with six SCSI disks, configured as
(multiple) 5-disk RAID-5 plus one hot spare disk. However, it's not
immediately obvious to me from the output WHICH of the disks is the
spare (I know that it's /dev/sdf, since that's the one I added as
spare after creating the array with no spare disk, but what if I
didn't know that?).
My motivation to ask this is actually so that I might be able to
decide whether I could tell the spare disk to spin down, since it's
not it use. No point having it spinning wearing itself down when the
point of it is to work in case one of the others fail.
# cat /proc/mdstat
Personalities : [raid1] [raid5] [translucent]
read_ahead 1024 sectors
md0 : active raid1 sdb2[1] sda2[0] 64192 blocks [2/2] [UU]
md1 : active raid5 sdf5[5] sde5[4] sdd5[3] sdc5[2] sdb5[1] sda5[0] 706304 blocks level
5, 32k chunk, algorithm 2 [5/5] [UUUUU]
md2 : active raid5 sdf6[5] sde6[4] sdd6[3] sdc6[2] sdb6[1] sda6[0] 1959424 blocks
level 5, 32k chunk, algorithm 2 [5/5] [UUUUU]
md3 : active raid5 sdf7[5] sde7[4] sdd7[3] sdc7[2] sdb7[1] sda7[0] 1959424 blocks
level 5, 32k chunk, algorithm 2 [5/5] [UUUUU]
md4 : active raid5 sdf8[5] sde8[4] sdd8[3] sdc8[2] sdb8[1] sda8[0] 30587136 blocks
level 5, 32k chunk, algorithm 2 [5/5] [UUUUU]
unused devices: <none>
--
Osma Ahvenlampi
