Command to check the software raid is working fine:
Check the mdstat file:
# cat /proc/mdstat
You are looking for a line like this:
md0 : active raid1 sdb5[0] sda5[1] 32000 blocks [2/2] [UU]
If the last part ever changes you know one of the drives has failed, ie if it changes to "[2/1] [U_]" then the second drive is out.
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