Hello,
Noticing the problems Tor Vestbø is having, I remembered that I have an array
in a similar state, which I never figured out. The array has been working
flawlessly for 3 months, the monthly 'check' runs come back with everything
being clean. However this is how the array looks through mdadm's eyes:
root@Thesaurus:~# mdadm -D /dev/md5
/dev/md5:
Version : 01.01.03
Creation Time : Tue Jan 22 03:52:42 2008
Raid Level : raid5
Array Size : 865081344 (825.01 GiB 885.84 GB)
Used Dev Size : 576720896 (275.00 GiB 295.28 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Mon Mar 3 11:34:36 2008
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 2048K
Name : Thesaurus:Crypta (local to host Thesaurus)
UUID : 1decb2d1:ebf16128:a240938a:669b0999
Events : 9090
Number Major Minor RaidDevice State
4 8 3 0 active sync /dev/sda3 <-- why at
#4, not #0?
1 8 19 1 active sync /dev/sdb3
2 8 35 2 active sync /dev/sdc3
3 8 51 3 active sync /dev/sdd3
root@Thesaurus:~#
root@Thesaurus:~# mdadm -E /dev/sda3
/dev/sda3:
Magic : a92b4efc
Version : 1.1
Feature Map : 0x0
Array UUID : 1decb2d1:ebf16128:a240938a:669b0999
Name : Thesaurus:Crypta (local to host Thesaurus)
Creation Time : Tue Jan 22 03:52:42 2008
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 576733236 (275.01 GiB 295.29 GB)
Array Size : 1730162688 (825.01 GiB 885.84 GB)
Used Dev Size : 576720896 (275.00 GiB 295.28 GB)
Data Offset : 264 sectors <-- not sure why this is different from the rest
Super Offset : 0 sectors
State : active
Device UUID : 72d9ceb4:89a20f49:50d51384:9b164f72
Update Time : Mon Mar 3 11:34:26 2008
Checksum : 4bd3ae95 - correct
Events : 9090
Layout : left-symmetric
Chunk Size : 2048K
Array Slot : 4 (failed, 1, 2, 3, 0)
Array State : Uuuu 1 failed <-- why is that?
root@Thesaurus:~#
root@Thesaurus:~# mdadm -E /dev/sdb3
/dev/sdb3:
Magic : a92b4efc
Version : 1.1
Feature Map : 0x0
Array UUID : 1decb2d1:ebf16128:a240938a:669b0999
Name : Thesaurus:Crypta (local to host Thesaurus)
Creation Time : Tue Jan 22 03:52:42 2008
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 576733364 (275.01 GiB 295.29 GB)
Array Size : 1730162688 (825.01 GiB 885.84 GB)
Used Dev Size : 576720896 (275.00 GiB 295.28 GB)
Data Offset : 136 sectors
Super Offset : 0 sectors
State : active
Device UUID : 0ba427b2:6cc26a34:cc9838d9:1dc77772
Update Time : Mon Mar 3 11:39:01 2008
Checksum : 89d50e1f - correct
Events : 9090
Layout : left-symmetric
Chunk Size : 2048K
Array Slot : 1 (failed, 1, 2, 3, 0)
Array State : uUuu 1 failed <-- and that?
root@Thesaurus:~#
root@Thesaurus:~# mdadm -E /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 1.1
Feature Map : 0x0
Array UUID : 1decb2d1:ebf16128:a240938a:669b0999
Name : Thesaurus:Crypta (local to host Thesaurus)
Creation Time : Tue Jan 22 03:52:42 2008
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 576733364 (275.01 GiB 295.29 GB)
Array Size : 1730162688 (825.01 GiB 885.84 GB)
Used Dev Size : 576720896 (275.00 GiB 295.28 GB)
Data Offset : 136 sectors
Super Offset : 0 sectors
State : active
Device UUID : ada93838:5e3fef07:fd478ba7:8fcf75e6
Update Time : Mon Mar 3 11:39:44 2008
Checksum : 25bb4882 - correct
Events : 9090
Layout : left-symmetric
Chunk Size : 2048K
Array Slot : 2 (failed, 1, 2, 3, 0)
Array State : uuUu 1 failed <-- same here
root@Thesaurus:~#
root@Thesaurus:~# mdadm -E /dev/sdd3
/dev/sdd3:
Magic : a92b4efc
Version : 1.1
Feature Map : 0x0
Array UUID : 1decb2d1:ebf16128:a240938a:669b0999
Name : Thesaurus:Crypta (local to host Thesaurus)
Creation Time : Tue Jan 22 03:52:42 2008
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 576733364 (275.01 GiB 295.29 GB)
Array Size : 1730162688 (825.01 GiB 885.84 GB)
Used Dev Size : 576720896 (275.00 GiB 295.28 GB)
Data Offset : 136 sectors
Super Offset : 0 sectors
State : active
Device UUID : be5f202f:c9097996:98d66036:9b6453ee
Update Time : Mon Mar 3 11:40:11 2008
Checksum : 41dfecc1 - correct
Events : 9090
Layout : left-symmetric
Chunk Size : 2048K
Array Slot : 3 (failed, 1, 2, 3, 0)
Array State : uuuU 1 failed
root@Thesaurus:~# <-- and here
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