Hi Neil,
here is a procedure which shows you another problem. It has to do with
the table produced at the end of the mdadm -E command, showing the disks
and their status. Seems when a disk has failed and another added, the
failed one disappears.
Hope you can find the problem and fix it.
Regards,
Albert
Here is the exact procedure which shows the problem:
Create a container with 5 disks:
mdadm -CR /dev/md127 -e ddf -l container -n 5 /dev/loop[1-5]
Physical Disks : 5
Number RefNo Size Device Type/State
0 d1c8c16e 479232K /dev/loop1 Global-Spare/Online
1 6de79cb6 479232K /dev/loop2 Global-Spare/Online
2 b5fd1d6c 479232K /dev/loop3 Global-Spare/Online
3 0be2d310 479232K /dev/loop4 Global-Spare/Online
4 5d8ac3d0 479232K /dev/loop5 Global-Spare/Online
Create a RAID 5 set of 3 disks in container:
mdadm -CR /dev/md0 -l 5 -n 3 /dev/md127
Physical Disks : 5
Number RefNo Size Device Type/State
0 d1c8c16e 479232K /dev/loop1 active/Online
1 6de79cb6 479232K /dev/loop2 active/Online
2 b5fd1d6c 479232K /dev/loop3 active/Online
3 0be2d310 479232K /dev/loop4 Global-Spare/Online
4 5d8ac3d0 479232K /dev/loop5 Global-Spare/Online
Create a RAID 1 set of 2 disks in container:
mdadm -CR /dev/md1 -l 1 -n 2 /dev/md127
Physical Disks : 5
Number RefNo Size Device Type/State
0 d1c8c16e 479232K /dev/loop1 active/Online
1 6de79cb6 479232K /dev/loop2 active/Online
2 b5fd1d6c 479232K /dev/loop3 active/Online
3 0be2d310 479232K /dev/loop4 active/Online
4 5d8ac3d0 479232K /dev/loop5 active/Online
Fail first disk in RAID 5 set:
mdadm -f /dev/md0 /dev/loop1
Physical Disks : 5
Number RefNo Size Device Type/State
0 d1c8c16e 479232K /dev/loop1 active/Offline, Failed
1 6de79cb6 479232K /dev/loop2 active/Online
2 b5fd1d6c 479232K /dev/loop3 active/Online
3 0be2d310 479232K /dev/loop4 active/Online
4 5d8ac3d0 479232K /dev/loop5 active/Online
Remove failed disk:
mdadm -r /dev/md0 /dev/loop1
Physical Disks : 5
Number RefNo Size Device Type/State
0 d1c8c16e 479232K active/Offline,
Failed, Missing
1 6de79cb6 479232K /dev/loop2 active/Online
2 b5fd1d6c 479232K /dev/loop3 active/Online
3 0be2d310 479232K /dev/loop4 active/Online
4 5d8ac3d0 479232K /dev/loop5 active/Online
Add failed disk back:
mdadm -a --force /dev/md0 /dev/loop1
Physical Disks : 5
Number RefNo Size Device Type/State
0 d1c8c16e 479232K /dev/loop1 active/Offline,
Failed, Missing
1 6de79cb6 479232K /dev/loop2 active/Online
2 b5fd1d6c 479232K /dev/loop3 active/Online
3 0be2d310 479232K /dev/loop4 active/Online
4 5d8ac3d0 479232K /dev/loop5 active/Online
Add spare disk to container:
mdadm -a --force /dev/md0 /dev/loop6
Physical Disks : 5
Number RefNo Size Device Type/State
0 6de79cb6 479232K /dev/loop2 active/Online
1 b5fd1d6c 479232K /dev/loop3 active/Online
2 0be2d310 479232K /dev/loop4 active/Online
3 5d8ac3d0 479232K /dev/loop5 active/Online
4 1dcfe3cf 479232K /dev/loop6 active/Online, Rebuilding
This is wrong! Physical disks should be 6 now!
Removed failed disk (which is missing from list now!) again, zero
superblock and add again:
mdadm -r /dev/md0 /dev/loop1
mdadm --zero-superblock /dev/loop1
mdadm -a --force /dev/md0 /dev/loop1
Physical Disks : 6
Number RefNo Size Device Type/State
0 6de79cb6 479232K /dev/loop2 active/Online
1 b5fd1d6c 479232K /dev/loop3 active/Online
2 0be2d310 479232K /dev/loop4 active/Online
3 5d8ac3d0 479232K /dev/loop5 active/Online
4 1dcfe3cf 479232K /dev/loop6 active/Online
5 8147a3ef 479232K /dev/loop1 Global-Spare/Online
And there they are, all 6 of them.
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