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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LEARN ABOUT OPENSOLARIS
dda
dda(7D) Devices dda(7D)
NAME
dda - MMS disk archiving driver
SYNOPSIS
/devices/pseudo/dda@lun:bn
DESCRIPTION
The Media Management System (MMS) is a distributed removable media management system based on the IEEE 1244 Media Management System speci-
fication. MMS provides a uniform and consistent tape interface to client applications.
The dda driver is a pseudo tape drive with filesystem file media. The dda driver is a minimal emulation of the st(7D) tape driver mtio(7I)
interface with BSD no-rewind behavior and is used for MMS disk archiving. The dda driver should be used with a MMS MMP mount command han-
dle. You configure DDA tapes, drives, and libraries for disk archiving using the mmsadm(1M) command. You also use mmsadm(1M) to mount and
unmount dda media.
CONFIGURATION
To set the number of disk archiving tape drives available for MMS disk archiving, edit the /kernel/drv/dda.conf configuration file. The
default number of disk archiving tape drives is 20.
The disk archiving tape drive devlinks are located in the /dev/dda directory.
The DDA maximum block size is 262144 bytes and the minimum is 1 byte.
FILES
/kernel/drv/dda 32-bit kernel module (x86)
/kernel/drv/sparcv9/dda 64-bit kernel module (SPARC)
/kernel/drv/amd64/dda 64-bit kernel module (x86)
/kernel/drv/dda.conf dda configuration file
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+--------------------+---------------------------------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+---------------------------------------------------------+
|Architecture | SPARC, x86 |
+--------------------+---------------------------------------------------------+
|Availability | SUNWmmsr |
+--------------------+---------------------------------------------------------+
|Interface Stability | Uncommitted |
+--------------------+---------------------------------------------------------+
SEE ALSO
mt(1), mmsadm(1M), attributes(5), dmd(7D), st(7D), mtio(7I)
IEEE 1244 Removable Media Standards Specification -- IEEE, 2000
SunOS 5.11 17 Oct 2008 dda(7D)