I have a RAID5 array consisting of 4 drives that recently had a problem.
One of the drives 'removed' itself from the array and when I added it
back it started the background rebuilding I expected, however I then
noticed from smartctl that the drive was showing 'imminent failure'
due to 3300+ reallocated sector errors.
At this stage I decided I wanted to pull the drive before it finished
the rebuild and replace it.
However after I stopped the array using:-
mdadm --stop /dev/md126
I was unable to put that drive into fail status
mdadm --fail /dev/sdj1
No Such Device
At this stage I decided to leave the array offline till I had a
replacement drive available to slot in.
I now have the replacement drive and as I was unable to either fail or
remove the offending drive I decided to do a physical pull of the
drive, reboot the machine to show the drive remove and then a second
reboot with the new blank drive available.
This seems to have partially worked in that
mdadm -D /dev/md126
/dev/md126:
Version : 1.2
Creation Time : Sat Aug 6 01:24:12 2011
Raid Level : raid5
Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
Raid Devices : 4
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Sun Aug 7 05:23:45 2011
State : active, degraded, Not Started
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : MY_NEW_RAID
UUID : herro_this_isnt_needed
Events : 36003
Number Major Minor RaidDevice State
0 8 129 0 active sync /dev/sdi1
1 0 0 1 removed
2 8 161 2 active sync /dev/sdk1
3 8 177 3 active sync /dev/sdl1
Which is what I expected to see.
However I cannot add the replacement drive into the array.
~ >:mdadm --add /dev/md126 /dev/sdj1
mdadm: add new device failed for /dev/sdj1 as 4: Invalid argument
~ >:mdadm --add --force /dev/md126 /dev/sdj1
mdadm: set device faulty failed for /dev/sdj1: No such device
~ >:mdadm --re-add /dev/md126 /dev/sdj1
mdadm: --re-add for /dev/sdj1 to /dev/md126 is not possible
and even more confusingly
~ >:mdadm -E /dev/sdj1
/dev/sdj1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : not needed
Name : My_NEW_RAID
Creation Time : Sat Aug 6 01:24:12 2011
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3907027053 (1863.02 GiB 2000.40 GB)
Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : not needed
Update Time : Sun Aug 7 05:23:45 2011
Checksum : 6172254 - correct
Events : 0
Layout : left-symmetric
Chunk Size : 512K
Device Role : spare
Array State : AAAA ('A' == active, '.' == missing)
Could someone possibly point me in the right direction as to what I'm
doing wrong?
Thanks in advance.
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