Bug#603343: i have recreated this bug:a new added hdd is a spare instead of an active device

Package: mdadm
Version: 2.6.7.1
Severity: important

i use ubuntu 10.04 .
it's possible that i forgot once to "--set-faulty" before removing a
device.
first i created raid1 with 2 devices. after encountering the bug i grow
the raid from 2 devices to 4 hoping it will make room for other disks to
add.
here is the config:

dennis1 ~ $ cat /proc/mdstatiscuous mode
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sdd1[2] sdc1[0] sda1[1]
30716160 blocks [3/3] [UUU]
bitmap: 14/235 pages [56KB], 64KB chunk

md3 : active raid1 sda3[4](S) sdd3[5] sdc3[0]
452550976 blocks [4/1] [U___]
bitmap: 45/216 pages [180KB], 1024KB chunk

unused devices: <none>

dennis1 ~ $ sudo mdadm --examine /dev/sdc3
[sudo] password for denis:
/dev/sdc3:
Magic : a92b4efc
Version : 00.90.00
UUID : 4c2769e4:568869bc:2a972c67:788b998b (local to host
dennis1)
Creation Time : Wed Dec 22 05:55:45 2010
Raid Level : raid1
Used Dev Size : 452550976 (431.59 GiB 463.41 GB)
Array Size : 452550976 (431.59 GiB 463.41 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 3

Update Time : Sun Dec 26 06:40:59 2010
State : clean
Internal Bitmap : present
Active Devices : 1
Working Devices : 3
Failed Devices : 3
Spare Devices : 2
Checksum : a424be5c - correct
Events : 170512


Number Major Minor RaidDevice State
this 0 8 35 0 active sync /dev/sdc3

0 0 8 35 0 active sync /dev/sdc3
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 0 0 3 faulty removed
4 4 8 3 4 spare /dev/sda3
5 5 8 51 5 spare /dev/sdd3

dennis1 ~ $ sudo mdadm --examine /dev/sda3
/dev/sda3:
Magic : a92b4efc
Version : 00.90.00
UUID : 4c2769e4:568869bc:2a972c67:788b998b (local to host
dennis1)
Creation Time : Wed Dec 22 05:55:45 2010
Raid Level : raid1
Used Dev Size : 452550976 (431.59 GiB 463.41 GB)
Array Size : 452550976 (431.59 GiB 463.41 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 3

Update Time : Sun Dec 26 06:42:05 2010
State : clean
Internal Bitmap : present
Active Devices : 1
Working Devices : 3
Failed Devices : 3
Spare Devices : 2
Checksum : a424becc - correct
Events : 170550


Number Major Minor RaidDevice State
this 4 8 3 4 spare /dev/sda3

0 0 8 35 0 active sync /dev/sdc3
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 0 0 3 faulty removed
4 4 8 3 4 spare /dev/sda3
5 5 8 51 5 spare /dev/sdd3

dennis1 ~ $ sudo mdadm --detail /dev/md3
/dev/md3:
Version : 00.90
Creation Time : Wed Dec 22 05:55:45 2010
Raid Level : raid1
Array Size : 452550976 (431.59 GiB 463.41 GB)
Used Dev Size : 452550976 (431.59 GiB 463.41 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 3
Persistence : Superblock is persistent

Intent Bitmap : Internal

Update Time : Sun Dec 26 06:44:20 2010
State : active, degraded
Active Devices : 1
Working Devices : 3
Failed Devices : 0
Spare Devices : 2

UUID : 4c2769e4:568869bc:2a972c67:788b998b (local to host
dennis1)
Events : 0.170627

Number Major Minor RaidDevice State
0 8 35 0 active sync /dev/sdc3
1 0 0 1 removed
5 8 51 2 spare rebuilding /dev/sdd3
3 0 0 3 removed

4 8 3 - spare /dev/sda3




out of curiosity i will :

dennis1 ~ $ sudo mdadm --grow --force -n 1 /dev/md3
mdadm: Cannot set raid-devices for /dev/md3: Device or resource busy
dennis1 ~ $ sudo mdadm --grow -n 2 /dev/md3
dennis1 ~ $ sudo mdadm --grow --force -n 1 /dev/md3
mdadm: Cannot set raid-devices for /dev/md3: Device or resource busy


dennis1 ~ $ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sdd1[2] sdc1[0] sda1[1]
30716160 blocks [3/3] [UUU]
bitmap: 16/235 pages [64KB], 64KB chunk

md3 : active raid1 sda3[2](S) sdd3[3] sdc3[0]
452550976 blocks [2/1] [U_]
bitmap: 45/216 pages [180KB], 1024KB chunk

unused devices: <none>

dennis1 ~ $ sudo mdadm --examine /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 00.90.00
UUID : 4c2769e4:568869bc:2a972c67:788b998b (local to host
dennis1)
Creation Time : Wed Dec 22 05:55:45 2010
Raid Level : raid1
Used Dev Size : 452550976 (431.59 GiB 463.41 GB)
Array Size : 452550976 (431.59 GiB 463.41 GB)
Raid Devices : 2
Total Devices : 3
Preferred Minor : 3

Update Time : Sun Dec 26 06:49:12 2010
State : clean
Internal Bitmap : present
Active Devices : 1
Working Devices : 3
Failed Devices : 1
Spare Devices : 2
Checksum : a424c261 - correct
Events : 170800


Number Major Minor RaidDevice State
this 0 8 35 0 active sync /dev/sdc3

0 0 8 35 0 active sync /dev/sdc3
1 1 0 0 1 faulty removed
2 2 8 3 2 spare /dev/sda3
3 3 8 51 3 spare /dev/sdd3

dennis1 ~ $ sudo mdadm --grow -n 5 /dev/md3
dennis1 ~ $ sudo mdadm --examine /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 00.90.00
UUID : 4c2769e4:568869bc:2a972c67:788b998b (local to host
dennis1)
Creation Time : Wed Dec 22 05:55:45 2010
Raid Level : raid1
Used Dev Size : 452550976 (431.59 GiB 463.41 GB)
Array Size : 452550976 (431.59 GiB 463.41 GB)
Raid Devices : 5
Total Devices : 3
Preferred Minor : 3

Update Time : Sun Dec 26 06:49:53 2010
State : clean
Internal Bitmap : present
Active Devices : 1
Working Devices : 3
Failed Devices : 4
Spare Devices : 2
Checksum : a424c2fd - correct
Events : 170826


Number Major Minor RaidDevice State
this 0 8 35 0 active sync /dev/sdc3

0 0 8 35 0 active sync /dev/sdc3
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 0 0 3 faulty removed
4 4 0 0 4 faulty removed
5 5 8 3 5 spare /dev/sda3
6 6 8 51 6 spare /dev/sdd3

dennis1 ~ $ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sdd1[2] sdc1[0] sda1[1]
30716160 blocks [3/3] [UUU]
bitmap: 14/235 pages [56KB], 64KB chunk

md3 : active raid1 sda3[5](S) sdd3[6] sdc3[0]
452550976 blocks [5/1] [U____]
bitmap: 45/216 pages [180KB], 1024KB chunk

unused devices: <none>
dennis1 ~ $ sudo mdadm /dev/md3 -add /dev/sda3 /dev/sdd3
[sudo] password for denis:
mdadm: option -d not valid in manage mode
dennis1 ~ $ sudo mdadm /dev/md3 -add /dev/sda3
mdadm: option -d not valid in manage mode
dennis1 ~ $ sudo mdadm /dev/md3 -a /dev/sda3
mdadm: Cannot open /dev/sda3: Device or resource busy
dennis1 ~ $ sudo mdadm /dev/md3 -a /dev/sdd3
mdadm: Cannot open /dev/sdd3: Device or resource busy

the simptoms are identical:
if i remove now one of the spares, zero the superblock and add it back
it will start rebuilding on it untill around 50% and then it will stop
leaving me with the above data.

this happens only for the md3 device. for the md1 never had a problem.

thanks
Denis Toader





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