This is an automatically generated mail message from mdadm running on baron A DegradedArray event had been detected on md device /dev/md4. Faithfully yours, etc. P.S. The /proc/mdstat file currently contains the following: Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] md4 : active raid1 sda3[0] 2917026240 blocks super 1.2 [2/1] [U_] bitmap: 22/22 pages [88KB], 65536KB chunk md0 : active raid1 sdb1[3] sda1[2] 12581816 blocks super 1.2 [2/2] [UU] md3 : active raid1 sdb4[3] 1843414335 blocks super 1.2 [2/1] [U_] md1 : active raid1 sdb2[3] sda2[2] 524276 blocks super 1.2 [2/2] [UU] md2 : active raid1 sdb3[3] 1073740664 blocks super 1.2 [2/1] [U_] unused devices: <none>