I have upgraded my home server with some new goodies.
On my old server I had two 2TB mdadm raid1 arrays configured, which from my understanding should be more or less plug and play.
Well - for one of the arrays is was just that, the other however came up "clean, degraded" having dropped one of the disks.
/dev/md0 consists of /dev/sdb and /dev/sdc - /dev/sdb was dropped
/dev/md1 consists of /dev/sdd and /dev/sde - came up perfectly.
I've tried an assortment of assembling, and finally gave up, and resynced the array, but after a lenghty resync - the disk was dropped again after a reboot.
examine leads me to believe the superblock is dropped from sdb:
mdadm --examine /dev/sdb
Code:
/dev/sdb:
MBR Magic : aa55
Partition[0] : 3907029167 sectors at 1 (type ee)
mdadm --examine /dev/sdc:
Code:
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 11837750:0da374a3:b3267bd8:6b692947
Name : SERVER:0
Creation Time : Sat Jul 20 11:54:11 2013
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 1953383360 (1862.89 GiB 2000.26 GB)
Used Dev Size : 3906766720 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 19f08135:67a62542:fd34a4d2:f82926d3
Update Time : Sat Dec 20 22:24:50 2014
Checksum : d8baeb43 - correct
Events : 278
Device Role : Active device 1
Array State : .A ('A' == active, '.' == missing)
The old server ran Ubuntu 14.04, and the new is running Debian 7.7, but I doubt that is the reason for this.
Does anyone have any ideas about what has happened, and how I can get the array up and running again?
I am currently resyncing two new 4TB disks (in raid1), so when that is done I can move the data from /dev/md0 over there, and completely redo that array. But that would feel a bit like giving up, I'd much rather find a solution.
