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Special Forums Hardware Filesystems, Disks and Memory Help needed! Raid 5 failure on a Debian System Post 302792705 by jonlisty on Thursday 11th of April 2013 12:43:02 AM
Old 04-11-2013
Help needed! Raid 5 failure on a Debian System

Hello!

I have a 4-disc Raid 5 server running Open Media Vault (Debian). The other day, it disappeared from OMV, which was reporting 3 drives failed. Panic Stations. However, using MDADM I can get info from 3 of the drives which suggests they are functioning ok (info below). The remaining 4th drive doesn't give anything back via mdadm --examine. Any ideas how I can rebuild the drive without destroying the data? According to what I have read, as the three apparently working drives all have the same events number (103), it is fairly likely the data is intact on them - but how to I rebuild?

Thanks my lovelies!

Jon

/dev/sdf:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : dc344271:82f55bd0:fcfd0e16:a2a60bc8
Name : TTVServer:TTV2 (local to host TTVServer)
Creation Time : Mon Jan 7 11:03:39 2013
Raid Level : raid5
Raid Devices : 4

Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 17581590528 (8383.56 GiB 9001.77 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : c792c6b2:78fd4e78:e4f008ea:826e25e8

Update Time : Sat Apr 6 13:17:10 2013
Checksum : 30386dbe - correct
Events : 103

Layout : left-symmetric
Chunk Size : 512K

Device Role : Active device 0
Array State : AAAA ('A' == active, '.' == missing)


/dev/sdg:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : dc344271:82f55bd0:fcfd0e16:a2a60bc8
Name : TTVServer:TTV2 (local to host TTVServer)
Creation Time : Mon Jan 7 11:03:39 2013
Raid Level : raid5
Raid Devices : 4

Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 17581590528 (8383.56 GiB 9001.77 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : c0426118:614cb315:15c9a0ee:2ad88e26

Update Time : Sat Apr 6 13:17:10 2013
Checksum : 7638ae70 - correct
Events : 103

Layout : left-symmetric
Chunk Size : 512K

Device Role : Active device 1
Array State : AAAA ('A' == active, '.' == missing)



/dev/sdi:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : dc344271:82f55bd0:fcfd0e16:a2a60bc8
Name : TTVServer:TTV2 (local to host TTVServer)
Creation Time : Mon Jan 7 11:03:39 2013
Raid Level : raid5
Raid Devices : 4

Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 17581590528 (8383.56 GiB 9001.77 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 8a96d5fe:594418b6:c63dafd0:c459e498

Update Time : Sat Apr 6 13:17:10 2013
Checksum : 5175f080 - correct
Events : 103

Layout : left-symmetric
Chunk Size : 512K

Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing)
 

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CDRWTOOL(1)							     Commands							       CDRWTOOL(1)

NAME
cdrwtool - perform various actions on a CD-R, CD-RW, and DVD-R SYNOPSIS
cdrwtool -d device -i | -g cdrwtool -d device -s [ write-parameters ] cdrwtool -d device -q [ write-parameters ] cdrwtool -d device -m offset [ write-parameters ] cdwrtool -d device -u blocks [ write-parameters ] cdrwtool -d device -b b_mode [ write-parameters ] cdrwtool -d device -c blocks [ write-parameters ] cdwrtool -d device -f filename [ write-parameters ] cdwrtool -d device -r track [ write-parameters ] cdrwtool -h DESCRIPTION
The cdwrtool command can perform certain actions on a CD-R, CD-RW, or DVD-R device. Mainly these are blanking the media, formating it for use with the packet-cd device, and applying an UDF filesystem. The most common usage is probably the `quick setup' option: cdrwtool -d device -q which will blank the disc, format it as one large track, and write the UDF filesystem structures. Other options get and set various parameters of how the device is set up, and provide for different offsets, modes and settings from the defaults. The usefulness of most of the options is not explained. OPTIONS
Main directives: -d device Specify the device to use. eg. /dev/sr0 -i Print disc track info. -g Print write parameters. -u length Make a UDF filesystem using length number of blocks. -q `Quick setup': blank the disc, format it as one large track and write a UDF filesystem. -m offset Format the disc at offset number of blocks. -b mode Blank the disk using a mode of `full' or `fast'. -f filename Write file. -c track Close track. -r track Reserve track. -s Set write parameters determined by -l, -w, and -p options for the disc. (Note by your Debian maintainer: Apparently this option does nothing.) -v version Specify the udf revision to use. Valid revisions are 0x0201, 0x0200, 0x0150, and 0x0102. If omitted, mkudffs udf-version is 0x0150. -h Prints a sparse help message. Write parameters: -t speed Set write speed. (Defaults to 12x ?) -l type Set multi-session field. Either `0' (default), `1', or `3', corresponding to `No B0 pointer. Next Session not allowed', `B0 pointer = FF:FF:FF. Next session not allowed', and `Next session allowed. B0 pointer = next possible program area' respectively. -w mode Set write mode. Either `mode1' or `mode2' (default). -p type Set packet type. Either `0' or `1' (default), corresponding to variable and fixed packet sizes respectively. -o offset Set write offset. AUTHORS
Jens Axboe <axboe@suse.de> Ben Fennema <bfennema@falcon.csc.calpoly.edu> Some additions by Richard Atterer <atterer@debian.org> AVAILABILITY
cdrwtool is part of the udftools package and is available from http://linux-udf.sourceforge.net. SEE ALSO
pktsetup(1) udftools-1.0.0b2 2002-02-09 CDRWTOOL(1)
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