Hi Neil
I apologize if I made mistakes with the first mail post but probably
something went wrong, so this is a retry.
I'm looking for advice on my plan to recover my raid5 volume with mdadm.
I was in a hurry and made a stupid mistake when upgrading the MB bios.
Forgot to turn on the Intel SATA raid, and Windows recovery erased the
first disk of 4.
It is an array of 4x4TB, in a matrix, having 1 RAID0 volume, and 1 RAID5 vol.
Although the array displays a failed array in Windows, 3 disks are
active, and 1 is missing and showing as a non-raid array being
available.
In (my) theory, I should still be able to recover the raid5 vol. with
the remaining 3 disks, however I should specify the specific sector
offset I guess.
I read many articles on this, but none of them address the
'difficulty' of recovering a specific volume when multiple exist in an
array.
Although I've some backups, I really would appreciate your help in
getting this recovered.
sda is the SSD
sdb is the 'missing' and erased drive (serial ending on P82C)
sdc is the second drive in the array
sdd is the 3rd drive in the array
sde is the 4th drive in the array
sdf is the usb stick I'm running Fedora live from
What I've done so far :
- Started Fedora 15 Live from a USB
- installed the mdadm package data_offset and compiled
My plan to work with an offset to recover the [HitR5] volume:
- echo 1 > /sys/module/md_mod/parameters/
start_dirty_degraded
- mdadm -C /dev/md/imsm -e imsm -n 4 /dev/sdb /dev/sdc /dev/sdd /dev/sde
- mdadm -C /dev/md0 -l5 -n4 -c 128 /dev/sdb:1073746184s
/dev/sdc:1073746184s /dev/sdd:1073746184s /dev/sde:1073746184s
I'm in doubt about working with missing disks first to start a
degraded array, with -C and missing for the first drive.
Or choosing assemble --auto, or as stated above and create the volume with an
offset.
Another thing I'm not certain of: do I need to build a new mdadm with
data_offset, or is it already present in my 3.2.6 version?
When I built a new version with Neils mdadm I ended up with a 3.2.5 18May2012
version.
As I guess I have only one shot at this I have not executed anything yet.
thanks many for your help, time and advice!
best regards Dennis
=======output mdadm -Evvvvs=============
root@localhost ~]# mdadm -Evvvvs
mdadm: No md superblock detected on /dev/dm-1.
mdadm: No md superblock detected on /dev/dm-0.
/dev/sdf1:
MBR Magic : aa55
Partition[0] : 432871117 sectors at 3224498923 (type 07)
Partition[1] : 1953460034 sectors at 3272020941 (type 16)
Partition[3] : 924335794 sectors at 50200576 (type 00)
/dev/sdf:
MBR Magic : aa55
Partition[0] : 15769600 sectors at 2048 (type 0b)
/dev/sde:
Magic : Intel Raid ISM Cfg Sig.
Version : 1.3.00
Orig Family : f3437c9b
Family : f3437c9d
Generation : 00002c5f
Attributes : All supported
UUID : 47b011c7:4a8531ea:7e94ab93:06034952
Checksum : 671f5f84 correct
MPB Sectors : 2
Disks : 4
RAID Devices : 2
Disk03 Serial : PL1321LAG4RXEH
State : active
Id : 00000005
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
[HitR0]:
UUID : 73ecf2cf:fcfd2598:d6523381:71e57931
RAID Level : 0
Members : 4
Slots : [_UUU]
Failed disk : 1
This Slot : 3
Array Size : 4294967296 (2048.00 GiB 2199.02 GB)
Per Dev Size : 1073742088 (512.00 GiB 549.76 GB)
Sector Offset : 0
Num Stripes : 4194304
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
[HitR5]:
UUID : 71626250:b8fc1262:3545d952:69eb329e
RAID Level : 5
Members : 4
Slots : [_UU_]
Failed disk : 3
This Slot : 3 (out-of-sync)
Array Size : 20220831744 (9642.04 GiB 10353.07 GB)
Per Dev Size : 6740279304 (3214.02 GiB 3451.02 GB)
Sector Offset : 1073746184
Num Stripes : 26329208
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
Disk00 Serial : PL2311LAG1P82C:0
State : active
Id : ffffffff
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk01 Serial : PL1321LAG4NMEH
State : active
Id : 00000003
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk02 Serial : PL1321LAG4TH4H
State : active
Id : 00000004
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
/dev/sdd:
Magic : Intel Raid ISM Cfg Sig.
Version : 1.3.00
Orig Family : f3437c9b
Family : f3437c9d
Generation : 00002c5f
Attributes : All supported
UUID : 47b011c7:4a8531ea:7e94ab93:06034952
Checksum : 671f5f84 correct
MPB Sectors : 2
Disks : 4
RAID Devices : 2
Disk02 Serial : PL1321LAG4TH4H
State : active
Id : 00000004
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
[HitR0]:
UUID : 73ecf2cf:fcfd2598:d6523381:71e57931
RAID Level : 0
Members : 4
Slots : [_UUU]
Failed disk : 1
This Slot : 2
Array Size : 4294967296 (2048.00 GiB 2199.02 GB)
Per Dev Size : 1073742088 (512.00 GiB 549.76 GB)
Sector Offset : 0
Num Stripes : 4194304
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
[HitR5]:
UUID : 71626250:b8fc1262:3545d952:69eb329e
RAID Level : 5
Members : 4
Slots : [_UU_]
Failed disk : 3
This Slot : 2
Array Size : 20220831744 (9642.04 GiB 10353.07 GB)
Per Dev Size : 6740279304 (3214.02 GiB 3451.02 GB)
Sector Offset : 1073746184
Num Stripes : 26329208
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
Disk00 Serial : PL2311LAG1P82C:0
State : active
Id : ffffffff
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk01 Serial : PL1321LAG4NMEH
State : active
Id : 00000003
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk03 Serial : PL1321LAG4RXEH
State : active
Id : 00000005
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
/dev/sdc:
Magic : Intel Raid ISM Cfg Sig.
Version : 1.3.00
Orig Family : f3437c9b
Family : f3437c9d
Generation : 00002c5f
Attributes : All supported
UUID : 47b011c7:4a8531ea:7e94ab93:06034952
Checksum : 671f5f84 correct
MPB Sectors : 2
Disks : 4
RAID Devices : 2
Disk01 Serial : PL1321LAG4NMEH
State : active
Id : 00000003
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
[HitR0]:
UUID : 73ecf2cf:fcfd2598:d6523381:71e57931
RAID Level : 0
Members : 4
Slots : [_UUU]
Failed disk : 1
This Slot : 1
Array Size : 4294967296 (2048.00 GiB 2199.02 GB)
Per Dev Size : 1073742088 (512.00 GiB 549.76 GB)
Sector Offset : 0
Num Stripes : 4194304
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
[HitR5]:
UUID : 71626250:b8fc1262:3545d952:69eb329e
RAID Level : 5
Members : 4
Slots : [_UU_]
Failed disk : 3
This Slot : 1
Array Size : 20220831744 (9642.04 GiB 10353.07 GB)
Per Dev Size : 6740279304 (3214.02 GiB 3451.02 GB)
Sector Offset : 1073746184
Num Stripes : 26329208
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
Disk00 Serial : PL2311LAG1P82C:0
State : active
Id : ffffffff
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk02 Serial : PL1321LAG4TH4H
State : active
Id : 00000004
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk03 Serial : PL1321LAG4RXEH
State : active
Id : 00000005
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
mdadm: No md superblock detected on /dev/sdb1.
/dev/sdb:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sda2:
MBR Magic : aa55
Partition[0] : 1816210284 sectors at 1920221984 (type 72)
Partition[1] : 1953653108 sectors at 1936028192 (type 6c)
Partition[3] : 447 sectors at 27722122 (type 00)
/dev/sda1:
MBR Magic : aa55
Partition[0] : 1816210284 sectors at 1920221984 (type 72)
Partition[1] : 1953653108 sectors at 1936028192 (type 6c)
Partition[3] : 447 sectors at 27722122 (type 00)
/dev/sda:
MBR Magic : aa55
Partition[0] : 716800 sectors at 2048 (type 07)
Partition[1] : 499396608 sectors at 718848 (type 07)
mdadm: No md superblock detected on /dev/loop4.
mdadm: No md superblock detected on /dev/loop3.
mdadm: No md superblock detected on /dev/loop2.
mdadm: No md superblock detected on /dev/loop1.
mdadm: No md superblock detected on /dev/loop0.
/dev/md127:
Magic : Intel Raid ISM Cfg Sig.
Version : 1.3.00
Orig Family : f3437c9b
Family : f3437c9d
Generation : 00002c5f
Attributes : All supported
UUID : 47b011c7:4a8531ea:7e94ab93:06034952
Checksum : 671f5f84 correct
MPB Sectors : 2
Disks : 4
RAID Devices : 2
Disk02 Serial : PL1321LAG4TH4H
State : active
Id : 00000004
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
[HitR0]:
UUID : 73ecf2cf:fcfd2598:d6523381:71e57931
RAID Level : 0
Members : 4
Slots : [_UUU]
Failed disk : 1
This Slot : 2
Array Size : 4294967296 (2048.00 GiB 2199.02 GB)
Per Dev Size : 1073742088 (512.00 GiB 549.76 GB)
Sector Offset : 0
Num Stripes : 4194304
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
[HitR5]:
UUID : 71626250:b8fc1262:3545d952:69eb329e
RAID Level : 5
Members : 4
Slots : [_UU_]
Failed disk : 3
This Slot : 2
Array Size : 20220831744 (9642.04 GiB 10353.07 GB)
Per Dev Size : 6740279304 (3214.02 GiB 3451.02 GB)
Sector Offset : 1073746184
Num Stripes : 26329208
Chunk Size : 128 KiB
Reserved : 0
Migrate State : idle
Map State : failed
Dirty State : clean
Disk00 Serial : PL2311LAG1P82C:0
State : active
Id : ffffffff
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk01 Serial : PL1321LAG4NMEH
State : active
Id : 00000003
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
Disk03 Serial : PL1321LAG4RXEH
State : active
Id : 00000005
Usable Size : 7814030862 (3726.02 GiB 4000.78 GB)
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