hi folks!
i am using a small 3-disk software raid on a linux redhat 7.3 system for
my home directory.
never had any problems since today, somehow the power cable of to two of
my disks dropped (a fan in the case got loose which was connected to the
same cable!). only some seconds later i shut down the system, switched
it off and reconneceted the disks. the raid device /dev/md0 was not used
by the time the power failure happend (i was not logged in, /dev/md0
only contains /home), so actually there should be no loss of data.
but how do i tell the system just to reuse the disks?
i read some howtos and articles in the mailing archiv but found no
instruction for this case or (completely ?) different ways (one said
just use "mkraid --create", others "raidhotadd")
so what is the correct way? the data on /home is quite important to me
and the last backup a week ago unfortunately does not include some
relevant changes! because of this i dared not to try things out.
attached are the contents/output of /etc/raidtab, mdadm --examine and
/var/log/messages.
i hope you can help me to reuse my data!
thanks in advance for your hints!
markus
my config:
---8<---
[root@merlin root]# cat /etc/raidtab
raiddev /dev/md0
raid-level 5
nr-raid-disks 3
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/sda1
raid-disk 0
device /dev/sdb1
raid-disk 1
device /dev/sdc2
raid-disk 2
[root@merlin root]#
--->8---
some other output:
---8<---
[root@merlin root]# mdadm --examine /dev/sda1
/dev/sda1:
Magic : a92b4efc
Version : 00.90.00
UUID : 396dcf37:a40fe0d4:c6d72718:8dd3f5d6
Creation Time : Thu Jun 20 17:13:01 2002
Raid Level : raid5
Device Size : 4192832 (3.100 GiB 4.34 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Update Time : Sun Nov 24 12:30:33 2002
State : clean, no-errors
Active Devices : 1
Working Devices : 1
Failed Devices : 2
Spare Devices : 0
Checksum : 5687c1bf - correct
Events : 0.254
Layout : left-asymmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 1 0 active sync /dev/sda1
0 0 8 1 0 active sync /dev/sda1
1 1 8 17 1 faulty /dev/sdb1
2 2 8 34 2 faulty /dev/sdc2
[root@merlin root]#
[root@merlin root]# mdadm --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 00.90.00
UUID : 396dcf37:a40fe0d4:c6d72718:8dd3f5d6
Creation Time : Thu Jun 20 17:13:01 2002
Raid Level : raid5
Device Size : 4192832 (3.100 GiB 4.34 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Update Time : Sun Nov 24 12:27:53 2002
State : dirty, no-errors
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Checksum : 5687c139 - correct
Events : 0.251
Layout : left-asymmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 17 1 active sync /dev/sdb1
0 0 8 1 0 active sync /dev/sda1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 34 2 active sync /dev/sdc2
[root@merlin root]#
[root@merlin root]# mdadm --examine /dev/sdc2
/dev/sdc2:
Magic : a92b4efc
Version : 00.90.00
UUID : 396dcf37:a40fe0d4:c6d72718:8dd3f5d6
Creation Time : Thu Jun 20 17:13:01 2002
Raid Level : raid5
Device Size : 4192832 (3.100 GiB 4.34 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Update Time : Sun Nov 24 12:27:53 2002
State : dirty, no-errors
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Checksum : 5687c14c - correct
Events : 0.251
Layout : left-asymmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 34 2 active sync /dev/sdc2
0 0 8 1 0 active sync /dev/sda1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 34 2 active sync /dev/sdc2
[root@merlin root]#
--->8---
the info in /var/log/messages when running "raidstart /dev/md0":
---8<---
Nov 24 21:02:08 merlin kernel: [events: 000000fe]
Nov 24 21:02:08 merlin kernel: [events: 000000fb]
Nov 24 21:02:08 merlin kernel: [events: 000000fb]
Nov 24 21:02:08 merlin kernel: md: autorun ...
Nov 24 21:02:08 merlin kernel: md: considering sdc2 ...
Nov 24 21:02:08 merlin kernel: md: adding sdc2 ...
Nov 24 21:02:08 merlin kernel: md: adding sdb1 ...
Nov 24 21:02:08 merlin kernel: md: adding sda1 ...
Nov 24 21:02:08 merlin kernel: md: created md0
Nov 24 21:02:08 merlin kernel: md: bind<sda1,1>
Nov 24 21:02:08 merlin kernel: md: bind<sdb1,2>
Nov 24 21:02:08 merlin kernel: md: bind<sdc2,3>
Nov 24 21:02:08 merlin kernel: md: running: <sdc2><sdb1><sda1>
Nov 24 21:02:08 merlin kernel: md: sdc2's event counter: 000000fb
Nov 24 21:02:08 merlin kernel: md: sdb1's event counter: 000000fb
Nov 24 21:02:08 merlin kernel: md: sda1's event counter: 000000fe
Nov 24 21:02:08 merlin kernel: md: superblock update time inconsistency
-- using the most recent one
Nov 24 21:02:08 merlin kernel: md: freshest: sda1
Nov 24 21:02:08 merlin kernel: md: kicking non-fresh sdc2 from array!
Nov 24 21:02:08 merlin kernel: md: unbind<sdc2,2>
Nov 24 21:02:08 merlin kernel: md: export_rdev(sdc2)
Nov 24 21:02:08 merlin kernel: md: kicking non-fresh sdb1 from array!
Nov 24 21:02:08 merlin kernel: md: unbind<sdb1,1>
Nov 24 21:02:08 merlin kernel: md: export_rdev(sdb1)
Nov 24 21:02:08 merlin kernel: md0: removing former faulty sdb1!
Nov 24 21:02:08 merlin kernel: md0: removing former faulty sdc2!
Nov 24 21:02:08 merlin kernel: md0: max total readahead window set to
512k
Nov 24 21:02:08 merlin kernel: md0: 2 data-disks, max readahead per
data-disk: 256k
Nov 24 21:02:08 merlin kernel: raid5: device sda1 operational as raid
disk 0
Nov 24 21:02:08 merlin kernel: raid5: not enough operational devices for
md0 (2/3 failed)
Nov 24 21:02:08 merlin kernel: RAID5 conf printout:
Nov 24 21:02:08 merlin kernel: --- rd:3 wd:1 fd:2
Nov 24 21:02:08 merlin kernel: disk 0, s:0, o:1, n:0 rd:0 us:1 dev:sda1
Nov 24 21:02:08 merlin kernel: disk 1, s:0, o:0, n:1 rd:1 us:1 dev:[dev
00:00]
Nov 24 21:02:08 merlin kernel: disk 2, s:0, o:0, n:2 rd:2 us:1 dev:[dev
00:00]
Nov 24 21:02:08 merlin kernel: raid5: failed to run raid set md0
Nov 24 21:02:08 merlin kernel: md: pers->run() failed ...
Nov 24 21:02:08 merlin kernel: md :do_md_run() returned -22
Nov 24 21:02:08 merlin kernel: md: md0 stopped.
Nov 24 21:02:08 merlin kernel: md: unbind<sda1,0>
Nov 24 21:02:08 merlin kernel: md: export_rdev(sda1)
Nov 24 21:02:08 merlin kernel: md: ... autorun DONE.
---8<---
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