David Greaves <david <at> dgreaves.com> writes:
>
> Cry wrote:
>> Folks,
>>
>> I had a drive fail on my 6 drive raid-5 array. while syncing in the
>> replacement
>> drive (11 percent complete) a second drive went bad.
>>
>
> blockdev --getra /dev/SOURCE <note the readahead value>
> blockdev --setro /dev/SOURCE
> blockdev --setra 0 /dev/SOURCE
> ddrescue /dev/SOURCE /dev/TARGET /somewhere_safe/logfile
>
> unless you've rebooted:
> blockdev --setrw /dev/SOURCE
> blockdev --setra <saved readahead value> /dev/SOURCE
>
> mdadm --assemble --force /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
> /dev/sde1
> cat /proc/mdstat will show the drive status
> mdadm --detail /dev/md0
> mdadm --examine /dev/sd[abcdef]1 [components]
I performed the above steps, however I used dd_rescue instead of ddrescue.
]# dd_rescue -l sda_rescue.log -o sda_rescue.bad -v /dev/sda /dev/sdg1
dd_rescue: (info): about to transfer 0.0 kBytes from /dev/sda to /dev/sdg1
dd_rescue: (info): blocksizes: soft 65536, hard 512
dd_rescue: (info): starting positions: in 0.0k, out 0.0k
dd_rescue: (info): Logfile: sda_rescue.log, Maxerr: 0
dd_rescue: (info): Reverse: no , Trunc: no , interactive: no
dd_rescue: (info): abort on Write errs: no , spArse write: if err
.......
dd_rescue: (info): /dev/sda (488386592.0k): EOF
Summary for /dev/sda -> /dev/sdg1:
dd_rescue: (info): ipos: 488386592.0k, opos: 488386592.0k,
xferd: 488386592.0k
errs: 504, errxfer: 252.0k,
succxfer: 488386336.0k
+curr.rate: 47904kB/s, avg.rate: 14835kB/s,
avg.load: 9.6%
/dev/sdg1 is my replacement drive (750G) that I had tried to sync
previously. The problem now is that while the copy happened, mdadm
still thinks it is that old spare:
~]# mdadm -E /dev/sdg1 /dev/sda
/dev/sdg1:
Magic : a92b4efc
Version : 00.90.00
UUID : 18e3d0b8:a21b31d2:7216c3e5:9bbd9f39
Creation Time : Thu May 24 01:55:48 2007
Raid Level : raid5
Used Dev Size : 488386432 (465.76 GiB 500.11 GB)
Array Size : 2441932160 (2328.81 GiB 2500.54 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 19 22:32:56 2008
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 2
Spare Devices : 1
Checksum : 1dc8dcfa - correct
Events : 0.1187802
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 6 8 97 6 spare /dev/sdg1
0 0 8 80 0 active sync /dev/sdf
1 1 8 64 1 active sync /dev/sde
2 2 8 128 2 active sync /dev/sdi
3 3 0 0 3 faulty removed
4 4 0 0 4 faulty removed
5 5 8 144 5 active sync /dev/sdj
6 6 8 97 6 spare /dev/sdg1
/dev/sda:
Magic : a92b4efc
Version : 00.90.00
UUID : 18e3d0b8:a21b31d2:7216c3e5:9bbd9f39
Creation Time : Thu May 24 01:55:48 2007
Raid Level : raid5
Used Dev Size : 488386432 (465.76 GiB 500.11 GB)
Array Size : 2441932160 (2328.81 GiB 2500.54 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 19 21:40:13 2008
State : clean
Active Devices : 5
Working Devices : 6
Failed Devices : 1
Spare Devices : 1
Checksum : 1dc8d023 - correct
Events : 0.1187796
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 4 8 0 4 active sync /dev/sda
0 0 8 80 0 active sync /dev/sdf
1 1 8 64 1 active sync /dev/sde
2 2 8 128 2 active sync /dev/sdi
3 3 0 0 3 faulty removed
4 4 8 0 4 active sync /dev/sda
5 5 8 144 5 active sync /dev/sdj
6 6 8 97 6 spare /dev/sdg1
and when I try to assemble the array, it only sees four disks
plus a spare.
]# mdadm --assemble --force --verbose /dev/md0 /dev/sdf /dev/sde
/dev/sdi /dev/sdj /dev/sdg1
mdadm: looking for devices for /dev/md0
mdadm: /dev/sdf is identified as a member of /dev/md0, slot 0.
mdadm: /dev/sde is identified as a member of /dev/md0, slot 1.
mdadm: /dev/sdi is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdj is identified as a member of /dev/md0, slot 5.
mdadm: /dev/sdg1 is identified as a member of /dev/md0, slot 6.
mdadm: added /dev/sde to /dev/md0 as 1
mdadm: added /dev/sdi to /dev/md0 as 2
mdadm: no uptodate device for slot 3 of /dev/md0
mdadm: no uptodate device for slot 4 of /dev/md0
mdadm: added /dev/sdj to /dev/md0 as 5
mdadm: added /dev/sdg1 to /dev/md0 as 6
mdadm: added /dev/sdf to /dev/md0 as 0
mdadm: /dev/md0 assembled from 4 drives and 1 spare - not enough to
start the array.
How do I transfer the label from /dev/sda (no partitions) to /dev/sdg1?
Thanks,
Cry
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