Topic: RAID status: output of cat /proc/mdstat

[Andrew Roberts]

I'm running 4.1.2 updated with all the latest packages.  The system has two WD HDDs with the software raid option, and are relatively new (<4 weeks of operation)

Output from cat /proc/mdstat follows:

[root@zeus /root]# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md2 : active raid1 hdb1[1] hda1[0] 264960 blocks [2/2] [UU]
md0 : active raid1 hdb5[1] hda5[0] 15936 blocks [2/2] [UU]
md1 : active raid1 hdb6[1] 19727680 blocks [2/1] [_U]
unused devices:

This would leave me to believe that there is a problem on hda6.  Any suggestions about what I should do would be appreciated.

[Walter Freisen]

There's nothing in the e-smith manual.  Any one have any ideas?

[Walter Freisen]

E-Smith RAID is just RedHat 7.0.  Here is what I found.  It's a good resource.

http://linas.org/linux/Software-RAID/Software-RAID.html

[Andrew Roberts]

Walter, thank you for those links, the were very helpful.

It turns out that the location (remote from me) had a power outage, and the UPS strategy had not been implemented yet .  I'm guessing that there was some filesystem corruption on hda6.

This is what I did:

1.  I ran fsck on /dev/hda6 (and fixed a whole bunch of errors)
2.  I then added the partition back to the array with:
      /sbin/raidhotadd /dev/md1 /dev/hda6

The disk is currently syncing now...

[root@zeus /sbin]# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md2 : active raid1 hdb1[1] hda1[0] 264960 blocks [2/2] [UU]
md0 : active raid1 hdb5[1] hda5[0] 15936 blocks [2/2] [UU]
md1 : active raid1 hda6[2] hdb6[1] 19727680 blocks [2/1] [_U] recovery=15% finish=142.8min
unused devices:

There is a good post at:

http://forums.contribs.org/index.php?topic=10221.msg38508#msg38508

that covers some of these items.

Cheers,

Andrew