On Fri, 25 Aug 2006, Robinson Tiemuqinke wrote:
Hi,
I still have several Fedora Core 4 boxes running with
software RAID5 created with mdadm tool.
Now one underlying component disk failed and have to
be replaced. But I have to save the data on the
software RAID5 device.
Any one can show me the correct "official way" to do
this job? Thanks a lot.
Detailed background: the RAID5 was created with the
following command:
" mdadm --create /dev/md0 --level=5 --raid-devices=3
/dev/sd[bcd]1 "
and now the sdb1 failed and I will replace it soon.
Please help.
--Robinson
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Like so:
p500b1:~# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Sat May 27 15:38:10 2006
Raid Level : raid5
Array Size : 4417280 (4.21 GiB 4.52 GB)
Device Size : 2208640 (2.11 GiB 2.26 GB)
Raid Devices : 3
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sat May 27 16:20:54 2006
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : a6a0f4cc:4311f7d2:739fc939:64a49b1c
Events : 0.853
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 0 0 - removed
------
p500b1:~# mdadm /dev/md0 -a /dev/sdc1
mdadm: hot added /dev/sdc1
p500b1:~#
p500b1:~# mdadm -D /dev/md0 |grep Rebuild
Rebuild Status : 4% complete
p500b1:~#
p500b1:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid5] [raid4] [raid6]
md0 : active raid5 sdc1[3] sdb1[1] sda1[0]
4417280 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
[======>..............] recovery = 32.7% (724864/2208640)
finish=5.3min speed=4588K/sec
unused devices: <none>
p500b1:~#
---------
recovery complete
p500b1:~# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Sat May 27 15:38:10 2006
Raid Level : raid5
Array Size : 4417280 (4.21 GiB 4.52 GB)
Device Size : 2208640 (2.11 GiB 2.26 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sat May 27 16:33:51 2006
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : a6a0f4cc:4311f7d2:739fc939:64a49b1c
Events : 0.859
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
p500b1:~#
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