Hi List
I have a D-Link DNS345 NAS which I configured as RAID5 + spare with 4x
500GB Seagate SATA drives.
I suspect a power surge caused the NAS to suddenly lose the volume.
All 4 drives checked out OK when doing a SMART test on the NAS itself.
I proceeded to build all 4 drives into a CentOS server, but was unable
to mount the RAID5 - error is always "not enough drives".
I followed some advise in archives, and did some mdadm -- examines,
and echo them below - what I don't understand is why the --examine
picks them up as RAID1.
Is there anything I can do to re-build this array?
Appreciate any help/advise.
Regards
/dev/sda1:
Magic : a92b4efc
Version : 0.90.00
UUID : 17888794:50a497c7:f853c57d:313558dc
Creation Time : Sat Sep 21 11:19:13 2013
Raid Level : raid1
Used Dev Size : 524224 (512.02 MiB 536.81 MB)
Array Size : 524224 (512.02 MiB 536.81 MB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 1
Update Time : Sun Sep 22 12:20:23 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : df65b6a0 - correct
Events : 6
Number Major Minor RaidDevice State
this 3 8 1 3 active sync /dev/sda1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 49 1 active sync /dev/sdd1
2 2 8 33 2 active sync /dev/sdc1
3 3 8 1 3 active sync /dev/sda1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : 17888794:50a497c7:f853c57d:313558dc
Creation Time : Sat Sep 21 11:19:13 2013
Raid Level : raid1
Used Dev Size : 524224 (512.02 MiB 536.81 MB)
Array Size : 524224 (512.02 MiB 536.81 MB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 1
Update Time : Sun Sep 22 12:20:23 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : df65b6aa - correct
Events : 6
Number Major Minor RaidDevice State
this 0 8 17 0 active sync /dev/sdb1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 49 1 active sync /dev/sdd1
2 2 8 33 2 active sync /dev/sdc1
3 3 8 1 3 active sync /dev/sda1
/dev/sdc1:
Magic : a92b4efc
Version : 0.90.00
UUID : 17888794:50a497c7:f853c57d:313558dc
Creation Time : Sat Sep 21 11:19:13 2013
Raid Level : raid1
Used Dev Size : 524224 (512.02 MiB 536.81 MB)
Array Size : 524224 (512.02 MiB 536.81 MB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 1
Update Time : Sun Sep 22 12:20:23 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : df65b6be - correct
Events : 6
Number Major Minor RaidDevice State
this 2 8 33 2 active sync /dev/sdc1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 49 1 active sync /dev/sdd1
2 2 8 33 2 active sync /dev/sdc1
3 3 8 1 3 active sync /dev/sda1
/dev/sdd1:
Magic : a92b4efc
Version : 0.90.00
UUID : 17888794:50a497c7:f853c57d:313558dc
Creation Time : Sat Sep 21 11:19:13 2013
Raid Level : raid1
Used Dev Size : 524224 (512.02 MiB 536.81 MB)
Array Size : 524224 (512.02 MiB 536.81 MB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 1
Update Time : Sun Sep 22 12:20:23 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : df65b6cc - correct
Events : 6
Number Major Minor RaidDevice State
this 1 8 49 1 active sync /dev/sdd1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 49 1 active sync /dev/sdd1
2 2 8 33 2 active sync /dev/sdc1
3 3 8 1 3 active sync /dev/sda1
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