In RAID 1 configuration, when both the disks are failed, state of only one of them is shown as faulty in the output of mdadm --detail /dev/mdX command, and the state of last failed disk is still displayed as active-sync.
$ mdadm --fail /dev/md0 /dev/sdf mdadm: set /dev/sdf faulty in /dev/md0 $ mdadm --detail /dev/md0 /dev/md0: Version : 00.90.03 Creation Time : Mon Aug 22 22:36:06 2011 Raid Level : raid1 ... Number Major Minor RaidDevice State 0 0 0 0 removed 1 8 80 1 active sync /dev/sdf <-- Still the device status is shown as Active Sync 2 8 112 - faulty spare /dev/sdh <-- Device /dev/sdh is already Faulty
- Red Hat Enterprise Linux 5.
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