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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MPT(4) BSD Kernel Interfaces Manual MPT(4)
NAME
mpt -- LSI Fusion-MPT SCSI/Fibre Channel driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device scbus
device mpt
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
mpt_load="YES"
DESCRIPTION
The mpt driver provides support for the LSI Logic Fusion-MPT family of SCSI, Fibre Channel and SAS controllers.
HARDWARE
The following controllers are supported by the mpt driver:
o LSI Logic 53c1030, LSI Logic LSI2x320-X (Single and Dual Ultra320 SCSI)
o LSI Logic AS1064, LSI Logic AS1068 (SAS/SATA)
o LSI Logic FC909 (1Gb/s Fibre Channel)
o LSI Logic FC909A (Dual 1Gb/s Fibre Channel)
o LSI Logic FC919, LSI Logic 7102XP-LC (Single 2Gb/s Fibre Channel)
o LSI Logic FC929, LSI Logic FC929X, LSI Logic 7202XP-LC (Dual 2Gb/s Fibre Channel)
o LSI Logic FC949X (Dual 4Gb/s Fibre Channel)
o LSI Logic FC949E, LSI Logic FC949ES (Dual 4Gb/s Fibre Channel PCI-Express)
The Ultra 320 SCSI controller chips supported by the mpt driver can be found onboard on many systems including:
o Dell PowerEdge 1750 thru 2850
o IBM eServer xSeries 335
These systems also contain Integrated Raid Mirroring and Integrated Raid Mirroring Enhanced which this driver also supports.
The SAS controller chips are also present on many new AMD/Opteron based systems, like the Sun 4100. Note that this controller can drive both
SAS and SATA drives or a mix of them at the same time. The Integrated Raid Mirroring available for these controllers is poorly supported at
best.
The Fibre Channel controller chipset are supported by a broad variety of speeds and systems. The Apple Fibre Channel HBA is in fact the
FC949ES card.
This driver also supports target mode for Fibre Channel cards. This support may be enabled by setting the desired role of the core via the
LSI Logic firmware utility that establishes what roles the card can take on - no separate compilation is required.
SEE ALSO
cd(4), ch(4), da(4), pci(4), sa(4), scsi(4), targ(4), mptutil(8), gmultipath(8)
LSI Logic Website, http://www.lsilogic.com/.
HISTORY
The mpt driver first appeared in FreeBSD 4.6.
AUTHORS
The mpt driver was originally written for FreeBSD by Greg Ansley and marginally improved upon by Matt Jacob <mjacob@FreeBSD.org>.
Justin Gibbs <gibbs@FreeBSD.org> and Scott Long <scottl@FreeBSD.org> have made more substantial improvements.
BUGS
BSD
May 13, 2010 BSD