Hello,
I have been trying all night to get my system back to work. One of the
two remaining hard-drives suddenly stopped working today. I read and
tried everything I could find that seemed to not make things worse
than they are. Finally I stumbled upon this page [1] on the Linux Raid
wiki which recommends to consult this mailing list.
I had a RAID 5 installation with three disks but disk 0 (I assume as
it was /dev/sda3) has been taken out for a while. The disks reside in
a remote server.
Sorry if this is obvious to you but I am totally stuck. I always run
into dead ends.
Your help is very much appreciated!
Thank you for any hints,
Fabio
I could gather the following information:
================================================================================
# mdadm --examine /dev/sd*3
mdadm: No md superblock detected on /dev/sda3.
/dev/sdb3:
Magic : a92b4efc
Version : 0.90.00
UUID : f07f4bc6:36864b49:776c2c25:004bd7b2
Creation Time : Wed May 4 08:18:11 2011
Raid Level : raid5
Used Dev Size : 1462766336 (1395.00 GiB 1497.87 GB)
Array Size : 2925532672 (2790.01 GiB 2995.75 GB)
Raid Devices : 3
Total Devices : 1
Preferred Minor : 127
Update Time : Thu Aug 28 19:55:59 2014
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
Checksum : 490fa722 - correct
Events : 68856340
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 19 1 active sync /dev/sdb3
0 0 0 0 0 removed
1 1 8 19 1 active sync /dev/sdb3
2 2 0 0 2 faulty removed
/dev/sdc3:
Magic : a92b4efc
Version : 0.90.00
UUID : f07f4bc6:36864b49:776c2c25:004bd7b2
Creation Time : Wed May 4 08:18:11 2011
Raid Level : raid5
Used Dev Size : 1462766336 (1395.00 GiB 1497.87 GB)
Array Size : 2925532672 (2790.01 GiB 2995.75 GB)
Raid Devices : 3
Total Devices : 2
Preferred Minor : 127
Update Time : Thu Aug 28 19:22:19 2014
State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 44f4f557 - correct
Events : 68856326
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 35 2 active sync /dev/sdc3
0 0 0 0 0 removed
1 1 8 19 1 active sync /dev/sdb3
2 2 8 35 2 active sync /dev/sdc3
================================================================================
# mdadm --examine /dev/sd[b]
/dev/sdb:
MBR Magic : aa55
Partition[0] : 4737024 sectors at 2048 (type 83)
Partition[2] : 2925532890 sectors at 4739175 (type fd)
================================================================================
Disk /dev/sdc has been replaced with a new hard drive as the old one
had input/output errors.
I assume this is weired and showed /dev/sdb3 before (changing things):
# cat /proc/mdstat
Personalities : [raid1]
unused devices: <none>
I tried to copy the structure from /dev/sdb to /dev/sdc which assumably work:
# sgdisk -R /dev/sdc /dev/sdb
***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format
in memory.
***************************************************************
The operation has completed successfully.
# sgdisk -G /dev/sdc
The operation has completed successfully.
# fdisk -l
-- Removed /dev/sda --
Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes, 2930277168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0005fb16
Device Boot Start End Blocks Id System
/dev/sdb1 2048 4739071 2368512 83 Linux
/dev/sdb3 * 4739175 2930272064 1462766445 fd Linux raid autodetect
WARNING: fdisk GPT support is currently new, and therefore in an
experimental phase. Use at your own discretion.
Disk /dev/sdc: 1500.3 GB, 1500301910016 bytes, 2930277168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt
# Start End Size Type Name
1 2048 4739071 2.3G Linux filesyste Linux filesystem
3 4739175 2930272064 1.4T Linux RAID Linux RAID
# mdadm --assemble /dev/md127 /dev/sd[bc]3
mdadm: no RAID superblock on /dev/sdc3
mdadm: /dev/sdc3 has no superblock - assembly aborted
# mdadm --assemble /dev/md127 /dev/sd[b]3
mdadm: /dev/md127 assembled from 1 drive - not enough to start the array.
# mdadm --misc -QD /dev/sd[bc]3
mdadm: /dev/sdb3 does not appear to be an md device
mdadm: /dev/sdc3 does not appear to be an md device
# mdadm --detail /dev/md127
/dev/md127:
Version :
Raid Level : raid0
Total Devices : 0
State : inactive
Number Major Minor RaidDevice
[1] https://raid.wiki.kernel.org/index.php/RAID_Recovery
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