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Full Discussion: Quorum and hdisk issue
Operating Systems AIX Quorum and hdisk issue Post 302827775 by bakunin on Sunday 30th of June 2013 04:39:07 PM
Old 06-30-2013
OK.

The output confirms that hdisk1 is the cause of your problem. Your volume group is definitely offline and gone with it are the filesystems it may have (once) contained. If they appear to be still mounted: don't believe it, they are gone.

What you see here is a description of the disk (hdisk1) in increasing detail:

Quote:
Originally Posted by newtoaixos
Code:
pmut3# lsdev -Cc disk
hdisk0 Available 06-08-01-3,0 16 Bit LVD SCSI Disk Drive
hdisk1 Available 06-08-01-4,0 16 Bit LVD SCSI Disk Drive
hdisk2 Available 06-08-01-5,0 16 Bit LVD SCSI Disk Drive
hdisk3 Available 06-08-01-8,0 16 Bit LVD SCSI Disk Drive

pmut3# lsattr -El hdisk1
PCM             PCM/friend/scsiscsd                    Path Control Module           False
algorithm       fail_over                              Algorithm                     True
dist_err_pcnt   0                                      Distributed Error Percentage  True
dist_tw_width   50                                     Distributed Error Sample Time True
hcheck_interval 0                                      Health Check Interval         True
hcheck_mode     nonactive                              Health Check Mode             True
max_transfer    0x40000                                Maximum TRANSFER Size         True
pvid            00c5c9cfcf30eee90000000000000000       Physical volume identifier    False
queue_depth     3                                      Queue DEPTH                   False
reserve_policy  single_path                            Reserve Policy                True
size_in_mb      73400                                  Size in Megabytes             False
unique_id       260800023B980AST373455LC08IBM   H0scsi Unique device identifier      False

And this is the probable cause for hdisk1 failing. I SNIPped to the interesting part:

Quote:
Originally Posted by newtoaixos
Code:
pmut3# errpt -aj 8647C4E2 | pg
<...SNIP....>
Resource tested:        hdisk1
Resource Description:   16 Bit LVD SCSI Disk Drive
Location:               U788C.001.AAB1650-P1-T11-L4-L0
SRN:                    000-129
Description:            Error log analysis indicates a SCSI bus problem.

Looks like your SCSI disk was failing somehow - this could be everything from a broken cable, a terminator gone bad to the disk itself become broken. First, make shure that the SCSI link is up again. Delete the hdisk1 devices and run "cfgmgr" to rediscover it. If it won't come back the disk is not connected (or broken), if it is in status "available" the disconnection is gone. You still should investigate, because a symptom gone is not a problem solved. Find the reason for the disconnection, only this will solve your problem.

Still, don't be shy to start repair action - this server will do nothing without the data necessary for carrying out its function anyway. If business complains: see above. If they are too greedy to pay for mirrored disks they will have to live with failing ones and the time necessary for repair. If the disks are indeed mirrored whoever forgot to (un)set the quorum is to blame and business will have every right to be angry. This is administration basics and should not happen at all.

I hope this helps.

bakunin
 

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