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Article ID: 4358
Last update: 11-24-04
Issue:
How do I check the status of my RAID array? In Solaris, I used the metastat command, is there an equivalent command in Red Hat Enterprise Linux 3?
Resolution:
To check the status of your RAID array you can issue the command: 
cat /proc/mdstat
This will give you information on RAID personalities. Example output of this command would look similar to the following: 

 
$ cat /proc/mdstat
Personalities : [raid0]
md0 : active raid0 hdd6[1] hda6[0]
      40692224 blocks 256k chunks


Here we see one striped RAID array that is currently active and has two member devices, hdd6 and hda6. The RAID has a total of 40692224 blocks and the chunk size is 256k.

In the event that your RAID array is rebuilding, this command will give you information on the percentage completion of the rebuild.

You can now use the mdadm command to extract further information. Information on mdadm is available by typing man mdadm in a terminal. Following is an example usage of mdadm, based on the example given above: 

 
# mdadm --examine /dev/hda6
/dev/hda6:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 28b55174:0f0b055e:29c12adf:a158a4d3
  Creation Time : Tue Sep 21 20:53:05 2004
     Raid Level : raid0
    Device Size : 19534848 (18.63 GiB 20.00 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Tue Sep 21 20:53:05 2004
          State : dirty
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 2fd39a8a - correct
         Events : 0.1

     Chunk Size : 256K

      Number   Major   Minor   RaidDevice State
this     0       3        6        0      active sync   /dev/hda6
   0     0       3        6        0      active sync   /dev/hda6
   1     1      22       70        1      active sync   /dev/hdd6


Here we are querying one of the devices identified by our use of cat /proc/mdstat. The dirty state means that the volume is currently mounted or that it was not dismounted cleanly before the last boot. It will remain in a dirty state until it is successfully mounted (note that it may already be mounted) and then dismounted.


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