Hi,
I have several multipath md arrays made from the two LUNs presented by a
Hitachi SAN. I created, mounted etc these while the system was running and all
seemed to be fine at that point.
However on a reboot several of the arrays have failed to come up. It looks
like a combination of problems have resulted in the superblocks being
incorrect. An example output of mdadm -E is below
[root@fs1 src]# mdadm -E /dev/scsi/sdh1-0c0i3l12
/dev/scsi/sdh1-0c0i3l12:
Magic : a92b4efc
Version : 00.90.00
UUID : c1c48438:2e955af4:caac8720:d04d6d22
Creation Time : Thu Feb 10 16:32:28 2005
Raid Level : multipath
Raid Devices : 1
Total Devices : 2
Preferred Minor : 16
Update Time : Thu Feb 10 16:32:28 2005
State : active
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Checksum : f8951a65 - correct
Events : 0.1
Number Major Minor RaidDevice State
this 1 65 240 1
spare /dev/scsi/sdh1-0c0i1l15
0 0 65 224 0 active
sync /dev/scsi/sdh1-0c0i1l14
1 1 65 240 1
spare /dev/scsi/sdh1-0c0i1l15
The devices that are listed as being components of the array do not include
the device that was queried.
I've resolved the device node issue and am considering rewiring the
superblocks by re-creating the raid devices - my understanding is that this
shouldn't damage the data as only the superblocks get changed when creating a
multipath device ??
Can anyone see any hidden risks in this - or a better way of fixing the
problem ?
thanks
--
Franc Carter Ph:61-2-9236-9127 Fax: 61-2-9321-5988
Systems Manager, SIRCA Ltd http://www.sirca.org.au/
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