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тАО08-18-2005 08:23 AM
тАО08-18-2005 08:23 AM
I routinely perform $Analyze /Disk /Repair, on disks as part of normal maintenance on all disks. The other day, I just happened to do an $Reply /Enable = Disk, prior to Analyze. And every time I perform the repair operation on an SWXCR disk (all are shadow sets), the disk would go into mount verification. The verification completes immediately It does not happen on my HSZ40 disks nor on the KPSA disks. The mount verification only occurs with the repair qualifier on the SWXCR.
What could be wrong? Or is this expected behavior on SWXCRs? Am I sitting on a time bomb?
System: OpenVMS 7.3-1 on an DS20 dual 500 Mhz.
Enjoy,
--Jeff
Solved! Go to Solution.
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тАО08-18-2005 09:42 AM
тАО08-18-2005 09:42 AM
Re: Mount Verification Error After Analyze /Repair
The System Management Utilities Reference Manual for V7.3-2 states that "When you update the storage control block (SCB) within a BITMAP.SYS
file, the VERIFY utility forces the volume to perform mount verification if
the volume is controlled by host-based shadowing".
Now, your Analyze/Disk/Repair can call upon the VERIFY utility behind the scenes. This could be what is happening in V7.3-1. So, in answer to one of your questions, I suspect that this is expected behaviour.
V7.3-2 introduced quieter mount verification. The following is from the V7.3-2 New Features and Documentation manual "Quieter mount verification suppresses the messages that previously were displayed for mount verification events from which the devices immediately recovered. These messages alarmed some customers".
Hope this helps,
Ian
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тАО08-18-2005 10:13 AM
тАО08-18-2005 10:13 AM
Re: Mount Verification Error After Analyze /Repair
Suppression of certain mount verification messages is controlled by the SYSGEN params MVSUPMSG_INTVL and MVSUPMSG_NUM. The documentation gives a reasonable explanation of how these parameters work.
Some background -- as part of multipath path switching, mount verification is entered (for both a manual path switch [$ SET DEVICE /SWITCH /PATH =
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тАО08-18-2005 10:23 AM
тАО08-18-2005 10:23 AM
Re: Mount Verification Error After Analyze /Repair
$ SWXCR MONITOR device_name
will start a monitoring process that will send OPCOM messages for any device not in an optimal state.
Andy
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тАО08-18-2005 06:00 PM
тАО08-18-2005 06:00 PM
Re: Mount Verification Error After Analyze /Repair
ANAL/DISK is the VERIFY utility - just type CTRL-T when running it.
SET VOL/REBUILD=FORCE on a shadowset will also put the device into mount-verification shortly. The same thing would also happen on MOUNT/REBUILD.
The ACPCONTROL function FORCE_MV is used to force mount-verification and the SCB is re-read to make sure, that it has been successfully updated on disk.
Volker.
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тАО08-19-2005 03:13 AM
тАО08-19-2005 03:13 AM
Re: Mount Verification Error After Analyze /Repair
Ian,
Your suspicions appear to be confirmed by the well respected ITRC experts.
---^
Robert,
Since I did not change the defaults, and I do not believe I am doing path switching, and this OPCOM message only appears on SWXCR shadow sets, why is it "suppressed" or not "activated" on my other controllers' shadow sets? Does this indicate that there is "truly a problem?" Or is the SWXCR just taking longer to respond and triggers the mount verification? Or...? (bad cable, SW I/O module, SWXCR...)
As soon as I find the documentation, it`s on a CDrom here somewhere...
---^
Andy,
All drives are optimal.
Yes, I had the monitor running in the past. I had it EMail me as well as OPCOM. But...I quiesce the data on the shadow set, dismount a shadow member, back it up, mount it back into the shadow set. I have shut down the monitor as it "locks" a channel on the first drive (dr0:) and can not be dismounted.
---^
Volker,
So, I infer that the ACPCONTROL function FORCE_MV is used at some point by the repair operation of the Verify utility?
---^
Thanks again everybody.
Enjoy,
--Jeff
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тАО08-19-2005 03:30 AM
тАО08-19-2005 03:30 AM
Re: Mount Verification Error After Analyze /Repair
SWXCR MON/LOG DRAX:
We ran SWXCR drives for a number of years, and the monitor almost always picked up a pending device failure well before VMS started logging errors, and before it failed completely.
I would highly recommend that you re-enable the monitor on a different device, or do your backups from a 'non' 0 drive.
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тАО08-19-2005 03:44 AM
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тАО08-19-2005 07:35 AM
тАО08-19-2005 07:35 AM
Re: Mount Verification Error After Analyze /Repair
Volker, Okay, I believe what you are saying. Thank you for your continued assistance.
Out of curiosity, why does the OPCOM message either "suppress" or not trigger on non-SWXCR controllers?
Enjoy,
--Jeff
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тАО08-19-2005 09:33 PM
тАО08-19-2005 09:33 PM
Re: Mount Verification Error After Analyze /Repair
are your HSZ and KxPSA disks also shadowsets?
Volker.