HP StorageWorks Scalable File Share User Manual

Page 282

Troubleshooting

9–58

Number Major Minor RaidDevice State
0 105 96 0 active sync /dev/cciss/c1d6
1 105 32 -1 faulty /dev/cciss/c1d2

# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [multipath]
read_ahead 1024 sectors
md0 : active raid1 cciss/c1d2[1](F) cciss/c1d6[0]
10485504 blocks [2/1] [U_]

unused devices:

If you have stopped and restarted the file system or rebooted the

south2

server, the status may

indicate that the failed component is missing, instead of failed. In this case, the

mdadm

command

shows a different status, as shown in this example:

# mdadm --detail /dev/md0/dev/md0:
.

State : clean, degraded
.

Number Major Minor RaidDevice State
0 105 96 0 active sync /dev/cciss/c1d6
1 0 0 -1 removed

Whether the component is failed or missing does not matter; proceed with the remaining steps.

In the example in the previous step, the

/dev/cciss/c1d2

component is shown to have failed,

while the

/dev/cciss/c1d6

component is operational. You can determine which LUN the

/dev/cciss/c1d2

component is associated with by entering the command shown in the following

example:

# ls -l /dev/hpls | grep c1d2$
lrwxrwxrwx 1 root root 9 May 4 01:49 /dev/hpls/dev22a -> /dev/cciss/c1d2

lrwxrwxrwx 1 root root 17 Nov 4 17:23 /dev/hpls/dev22a1
-> /dev/cciss/c1d2p1

In this example, LUN 22 (

/dev/hpls/dev22a

) is the failed mirror component.

Remove the failed mirror component and then add it again, as shown in the following example:

# mdadm --remove /dev/md0 /dev/cciss/c1d2
mdadm: hot removed /dev/cciss/c1d2
# mdadm --add /dev/md0 /dev/cciss/c1d2
mdadm: hot added /dev/cciss/c1d2

NOTE:

The

mdadm --remove

command may fail if the failed mirror component has already

been removed. This is normal and you can proceed to run the

mdadm --add

command.

At this point, the RAID device will recover and start to resynchronize the device. You can check the

status and progress of the resynchronization of the device using the

mdadm

command, as shown in

the following example:

# mdadm --detail /dev/md0
/dev/md0:
.

State : clean, degraded, recovering
.

Rebuild Status : 26% complete
.

Number Major Minor RaidDevice State
0 105 96 0 active sync /dev/cciss/c1d6
1 0 0 -1 removed
2 105 32 0 spare /dev/cciss/c1d2