Hey List,
i have a serious problem: have a file server with 4 disk (4x750GB),
using them in a software RAID10 array. One of the HDDs have a bad sector
(because some administration problems, i cannot replace them), and the
motherboard sometimes drops the connection with two HDDs. Not with the
same as the bad sector has, but with a resync i always managed the
problem. But now 3 drive form the RAID10 array dropped.
In the past the sdc6 and the sdd6 partitions were the partitions i
resynced the others, so i know exactly where to look for the proper
datas. Can i use them as a RAID0 array somehow?
In past mdadm warning letters i saw the config:
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5]
[raid4] [multipath] [faulty]
md5 : active raid10 sdc6[0] sdd6[3] sdb6[1](F) sda6[2](F)
1434619904 blocks super 1.1 512K chunks 2 near-copies [4/2] [U__U]
md1 : active raid1 sdb5[0] sdc5[1]
14763635 blocks super 1.1 [2/2] [UU]
md0 : active raid1 sdd5[0] sda5[2](F)
14659200 blocks [2/1] [U_]
unused devices: <none>
Now i have:
minerva ~ # cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5]
[raid4] [multipath] [faulty]
md5 : inactive sdd6[3]
717310119 blocks super 1.1
md1 : active raid1 sdc5[0] sdb5[1]
14763635 blocks super 1.1 [2/2] [UU]
md0 : active raid1 sda5[1] sdd5[0]
14659200 blocks [2/2] [UU]
unused devices: <none>
minerva ~ # mdadm --detail /dev/md5
/dev/md5:
Version : 1.1
Creation Time : Thu Nov 26 14:50:07 2009
Raid Level : raid10
Used Dev Size : 717309952 (684.08 GiB 734.53 GB)
Raid Devices : 4
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Wed Jul 7 10:34:32 2010
State : active, FAILED, Not Started
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 512K
Name : minerva:5 (local to host minerva)
UUID : a73f5902:accc2488:aecfdc14:05a6e2f4
Events : 3981420
Number Major Minor RaidDevice State
0 0 0 0 removed
1 0 0 1 removed
2 0 0 2 removed
3 8 54 3 active sync /dev/sdd6
If i try to add sdc6 to the md5 array it fails, because it tries to add
as a fifth device:
minerva ~ # mdadm /dev/md5 -a /dev/sdc6
mdadm: add new device failed for /dev/sdc6 as 4: Invalid argument
Please help, i don't want to destroy the datas, and i have never job
with RAID10 under linux.
thanks in advance,
regards,
Csaba
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