Hi there
I tried sending to linux-raid@xxxxxxxxxxxxxxx about 10 days ago but got no answer, your guys are probably just busy but incase you did not get the email i’m sending it here as well.
Hi there and thanks for your service
I’m having a problem with my 4x 2tb raid 5 mdadm array.
After an unexpected shutdown my machine booted into dos busybox, when i typed exit I got the ubuntu(12.04) logo and a message telling me it could not mount my raid drive so I pressed S to skip it.
The first thing I did was to do a complete long test with seagate sea tools to check all my hard drives for errors and all the drives are ok.
I found out that 2 of my drives where not assembling into the array.
When I tried to assemble the array it told me on these two drives there were no md superblocks detected.
I started googling around and trying to find a solution to the problem , found lots of forums and people with similar problems,
When I tried : sudo mdadm —assemble —scan in the first place it responded that i had duplicate UUID in my mdadm config file. So I looked at the config file and found these 2 UUID :
ARRAY /dev/md0 level=raid5 num-devices=3 UUID=f7783df2:bc896dcc:9c729cd1:10366cce
ARRAY /dev/md0 level=raid5 num-devices=3 UUID=48877e00:48c5e221:9c729cd1:10366cce
the weird thing here is that the number of devices here are 3 not 4 like I have always been using, at least I’ve been using 4 2 tb drives to get about 6 tb of space in an array in raid 5, not that it really matters anyways, tried changing it but nothing happens when i execute the command : sudo mdadm —assemble —scan , don’t know why that is, maybe there is another config file I don’t know about
anyways’ i got this command from somebody with a similar problem : sudo mdadm –examine –scan –config=mdadm.conf >> /etc/mdadm/mdadm.conf
and got some UUID copy-ed into my config file and tried the scan again but it did not work.
I’ve tried so far : root@tserver:~# mdadm --create /dev/md0 --verbose --level=5 --raid-devices=4 /dev/sdd missing /dev/sdc missing
and got this response: mdadm: layout defaults to left-symmetric
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 512K
mdadm: /dev/sdd appears to contain an ext2fs file system
size=1565576192K mtime=Sat Nov 9 20:54:11 2013
mdadm: /dev/sdd appears to be part of a raid array:
level=raid5 devices=4 ctime=Tue Jan 11 00:26:47 2011
mdadm: /dev/sdc appears to be part of a raid array:
level=raid5 devices=4 ctime=Tue Jan 11 00:26:47 2011
mdadm: size set to 1953382912K
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: RUN_ARRAY failed: Input/output error
i was afraid that the create command could erase my data but some people in the same position suggested it was okay.
I’ve tried the UUID assemble command and nothing happens : mdadm --assemble /dev/md# --uuid=<UUID>
here is my mdadm —examine :
root@tserver:~# mdadm --examine /dev/sda
mdadm: No md superblock detected on /dev/sda.
root@tserver:~# mdadm --examine /dev/sda1
mdadm: cannot open /dev/sda1: No such file or directory
root@tserver:~# mdadm --examine /dev/sda
mdadm: No md superblock detected on /dev/sda.
root@tserver:~# mdadm --examine /dev/sdc
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 3e74cf9b:b49ecf15:98722946:b19b30b6
Name : tserver:0 (local to host tserver)
Creation Time : Mon Nov 18 23:05:33 2013
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 5860148736 (5588.67 GiB 6000.79 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 3c5cb8d9:072a09df:72a9bf89:fa579762
Update Time : Mon Nov 18 23:05:33 2013
Checksum : 1fe51ccc - correct
Events : 0
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : A.A. ('A' == active, '.' == missing)
root@tserver:~# mdadm --examine /dev/sdd
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 3e74cf9b:b49ecf15:98722946:b19b30b6
Name : tserver:0 (local to host tserver)
Creation Time : Mon Nov 18 23:05:33 2013
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 5860148736 (5588.67 GiB 6000.79 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 9a96576f:4fba1e25:7077591b:c9987f29
Update Time : Mon Nov 18 23:05:33 2013
Checksum : 541bf63b - correct
Events : 0
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : A.A. ('A' == active, '.' == missing)
root@tserver:~# mdadm --examine /dev/sde
mdadm: No md superblock detected on /dev/sde.
and sudo fdisk -l :
sudo fdisk -l
Disk /dev/sda: 2000.4 GB, 2000397852160 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907027055 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 identifier: 0x00000000
Disk /dev/sda doesn't contain a valid partition table
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 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 identifier: 0x00000000
Disk /dev/sdc doesn't contain a valid partition table
Disk /dev/sde: 2000.4 GB, 2000397852160 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907027055 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 identifier: 0x00000000
Disk /dev/sde doesn't contain a valid partition table
Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 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 identifier: 0x00000000
Disk /dev/sdd doesn't contain a valid partition table
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 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 identifier: 0x00026ec6
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 937164799 468581376 83 Linux
/dev/sdb2 937166846 976771071 19802113 5 Extended
/dev/sdb5 937166848 976771071 19802112 82 Linux swap / Solaris
can you suggest anything?
My goal is to be able to re arrange my array without any data loss :)
Thanks for reading
Best Regards
Teitur--
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