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I recently set up a new server here at the office that includes three RAID1 arrays. I have two, identical 160GB drives with 3 partitions. Each partition is in an array with its "twin" partition on the opposite drive. On boot, I'm getting a degraded array error.
root@securevm [~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1
102388 blocks super 1.0 [2/1] [_U]
md2 : active raid1 sdb3
139801532 blocks super 1.1 [2/1] [_U]
bitmap: 2/2 pages [8KB], 65536KB chunk
md1 : active raid1 sdb2
16382908 blocks super 1.1 [2/1] [_U]
unused devices: <none>
root@securevm [~]# mdadm -D /dev/md0
Version : 1.0
Creation Time : Mon Jan 23 05:54:37 2012
Raid Level : raid1
Array Size : 102388 (100.01 MiB 104.85 MB)
Used Dev Size : 102388 (100.01 MiB 104.85 MB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Tue Jan 24 08:33:30 2012
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Name : <snip>
UUID : 2bfa1531:acf02178:f07dd7bd:8b5f18cf
Events : 120
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 17 1 active sync /dev/sdb1
This is repeated for the other two arrays
If I'm reading this correctly, it seems my arrays aren't seeing my first drive (/dev/sda), right?
Smartctl shows no issues with either drive, so I'm assuming the drives are good, but just not sync'd.