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Checking the status of your RAID

A useful command to check the status is:

cat /proc/mdstat

Example output:

 Personalities : [raid1] [raid6] [raid5] [raid4]
md5 : active raid1 sda7[0] sdb7[1]
      62685504 blocks [2/2] [UU]

md0 : active raid1 sda1[0] sdb1[1]
      256896 blocks [2/2] [UU]

md6 : active raid5 sdc1[0] sde1[2] sdd1[1]
      976767872 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]

You can see that all disks are present and in sync, with command:

sudo mdadm --query --detail /dev/md* 

Replace * with the partition number.

If you want to check the array for consistency use these commands.

sudo -i
cat /sys/block/md1/md/sync_action
echo check > /sys/block/md1/md/sync_action
mdadm --detail /dev/md1

 

Source: https://help.ubuntu.com/community/Installation/SoftwareRAID#Checking_the_status_of_your_RAID

http://ubuntuforums.org/showthread.php?t=1647483

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