David Greaves wrote:
So my RAID5 has 2 dead drives and is toasted :(
I had a few smaller disks on another machine which I lvm'ed together
to do a backup - but I could only fit about a quarter of my data
there. I'd *really* like not to have lost all this stuff.
However I do now have a 'good' drive.
Can I dd the newly dead drive (bear in mind it probably only has a bad
block or two) onto the new drive and come back up in degraded mode?
I've had a think and this is my plan.... comments appreciated.
Currently:
/dev/md0:
Version : 00.90.01
Creation Time : Sat Jun 5 18:13:04 2004
Raid Level : raid5
Array Size : 980446208 (935.03 GiB 1003.98 GB)
Device Size : 245111552 (233.76 GiB 250.99 GB)
Raid Devices : 5
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Nov 12 09:46:53 2004
State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
0 0 0 -1 removed
1 8 33 1 active sync /dev/sdc1
2 8 17 2 active sync /dev/sdb1
3 0 0 -1 removed
4 3 65 4 active sync /dev/hdb1
5 8 1 -1 faulty /dev/sda1
UUID : 19779db7:1b41c34b:f70aa853:062c9fe5
Events : 0.4443578
so, the plan in order to try and extract data:
* insert new drive as /dev/sdd1
* dd if=/dev/sda1 of=/dev/sdd1
* mdadm /dev/md0 --remove /dev/sda1
* physically swap /dev/sda and /dev/sdd so /dev/sdd
* mdadm /dev/md0 --add /dev/sda1
* fsck filesystem and expect to lose files where there were bad blocks
* wait for new drive (special delivery - tomorrow morning)
* insert new drive as /dev/sdd
* mdadm /dev/md0 --add /dev/sdd1
or am I wasting my time?
David
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