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added use case of failed disk that has not been kicked out of the array
md0 : active raid1 hda1[0] hdb1[1]
md0 : active raid1 hda1[0] hdb1[1]
If the raid has a failed disk that has not yet been kicked out of the array then mdstat will show something like the following:
md2 : active raid1 hda2[0]'''(F)''' hdb2[1] <-- Shows current active partition - with one '''FAILED (F)'''
1048704 blocks [2/1] [_U] <-- '_' = partition missing from array
In this case before you add the disk back in you will need to remove the disk as per:
[root@sme]# mdadm --remove /dev/md2 /dev/hda2
To add the physical partition back into that raid partition.
To add the physical partition back into that raid partition.