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RAID Status

cat /proc/mdstat
The output of /proc/mdstat is as follows : Personalities : [raid1] read_ahead 1024 sectors md0 : active raid1 sdb1[1] sda1[0] [2/2] [UU] * The [UU] part above specifies that both the partitions on the Raid Devices are up. * If you get [_U] in place of [UU] then the First HDD is down and raid is booting linux through the second HDD. Fix your first HDD problem and the recreate RAID. * [U_] indicate the Second HDD is down. Ref:

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