To clarify, all I want to do is temporarily mount the array so I can copy as
much data off as possible, then blow the entire array away and find out if
sdc really is bad, or its just a bad block or bad cable or whatever. I get
the feeling that sdc is mostly fine, in which case I should be able to
recover most of the data on the array.
Also, is it possible to set this disks read only so that mdadm won't write
to them no matter what I do? That would make me feel a lot better when
trying various options to force mdadm into mounting them.
Thanks, Frank
From: "frank jenkins" <fjenkins873@xxxxxxxxxxx>
To: linux-raid@xxxxxxxxxxxxxxx
Subject: raid5 recover after a 2 disk failure
Date: Sun, 17 Jun 2007 06:57:55 +0000
I have a 5 disk raid5 array that had a disk failure. I removed the disk,
added a new one (and a spare), and recovery began. Halfway through
recovery, a second disk failed.
However, while the first disk really was dead, the second seems to have
been a transient error, as the smart data and disk testing seem to show the
disk is fine.
The question is, how can I tell mdadm to unfail this second disk. From what
I've found in the archives, I think I need to use the --force option, but
I'm concern about getting device names in the wrong order (and totally
destroying my array in the process), so thought I'd ask here first. Here is
my /proc/mdstat when recovery initially began:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid5 sdc1[0](S) sdf1[5] sdb1[4] sda1[3] sde1[2] sdd1[1]
976783616 blocks level 5, 32k chunk, algorithm 2 [5/4] [_UUUU]
[>....................] recovery = 0.0% (237952/244195904)
finish=427.0min speed=9518K/sec
and here is my current mdstat:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid5 sdc1[5](S) sdf1[6](S) sdb1[4] sda1[3] sde1[7](F) sdd1[1]
976783616 blocks level 5, 32k chunk, algorithm 2 [5/3] [_U_UU]
sde is the disk that is now marked as failed, and which I would like to put
back into service.
Also, what does the number in []'s mean after each device, and why did that
number change on sdc, sde, and sdf?
Thanks, Frank
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