Need some help.
My system has a Raid 5 array made up of 4x750Gb Sata disks, on top of that I am using LVM with 3 LV's.
While building a second raid 10 array for some other disks my server froze to the point that it was completely unresponsive over network and on the console and I had to do a power button reset. After which my primary raid 5 Array is now missing. I have managed to manually re-assemble it with mdadm, and then re-scan LVM and get it to see the LVM volumes but it I haven't yet gotten it to recognize the file systems on there and re-mount them. After reboot it goes back to the way it was.
mdadm gives me the error: ARRAY line /dev/md/750Array has no identity information
Output of mdadm --examine:
root@fileyx64:~# mdadm --examine /dev/sde
mdadm: ARRAY line /dev/md/750Array has no identity information.
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 5476786c:af745935:5e3b3acb:7a5f449a
Name : fileyx64:750Array (local to host fileyx64)
Creation Time : Fri Aug 23 23:40:27 2013
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1465147120 (698.64 GiB 750.16 GB)
Array Size : 4395439104 (2095.91 GiB 2250.46 GB)
Used Dev Size : 1465146368 (698.64 GiB 750.15 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : dcb1ac32:c03e527e:cb52ef97:cda1ae68
Update Time : Sun Dec 22 10:52:29 2013
Checksum : e0df60fa - correct
Events : 136
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAA ('A' == active, '.' == missing)
root@fileyx64:~# mdadm --examine /dev/sdf
mdadm: ARRAY line /dev/md/750Array has no identity information.
/dev/sdf:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 5476786c:af745935:5e3b3acb:7a5f449a
Name : fileyx64:750Array (local to host fileyx64)
Creation Time : Fri Aug 23 23:40:27 2013
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1465147120 (698.64 GiB 750.16 GB)
Array Size : 4395439104 (2095.91 GiB 2250.46 GB)
Used Dev Size : 1465146368 (698.64 GiB 750.15 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 2df1fa19:f5dbc8d9:ca87bd0e:8a20caf2
Update Time : Sun Dec 22 10:52:29 2013
Checksum : 248df13e - correct
Events : 136
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAA ('A' == active, '.' == missing)
root@fileyx64:~# mdadm --examine /dev/sdh
mdadm: ARRAY line /dev/md/750Array has no identity information.
/dev/sdh:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 5476786c:af745935:5e3b3acb:7a5f449a
Name : fileyx64:750Array (local to host fileyx64)
Creation Time : Fri Aug 23 23:40:27 2013
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1465147120 (698.64 GiB 750.16 GB)
Array Size : 4395439104 (2095.91 GiB 2250.46 GB)
Used Dev Size : 1465146368 (698.64 GiB 750.15 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : ae5fcd60:22936c95:fb2c4be7:b4b1f56e
Update Time : Sun Dec 22 10:52:29 2013
Checksum : 7bbd4d48 - correct
Events : 136
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing)
root@fileyx64:~# mdadm --examine /dev/sdi
mdadm: ARRAY line /dev/md/750Array has no identity information.
/dev/sdi:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 5476786c:af745935:5e3b3acb:7a5f449a
Name : fileyx64:750Array (local to host fileyx64)
Creation Time : Fri Aug 23 23:40:27 2013
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1465147120 (698.64 GiB 750.16 GB)
Array Size : 4395439104 (2095.91 GiB 2250.46 GB)
Used Dev Size : 1465146368 (698.64 GiB 750.15 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : e2c2b9f6:d944a4b5:e3d733f0:a43ca6ed
Update Time : Sun Dec 22 10:52:29 2013
Checksum : b97a980d - correct
Events : 136
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAA ('A' == active, '.' == missing)
