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тАО03-03-2009 12:59 AM
тАО03-03-2009 12:59 AM
es45 cluster vms7.3-2+EVA 5000 storage, I know can do it,but no experience in a application online cluster.
Solved! Go to Solution.
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тАО03-03-2009 01:24 AM
тАО03-03-2009 01:24 AM
SolutionDone correctly, there is no risk that I am aware of.
Obviously, the storage containers must be larger than the declared disk size already. The SET VOLUME command only affects the OpenVMS file structure, not the underlying storage container on the EVA.
I discussed the process of increasing the size of dynamic volume during normal operation without interruption at several past HP Technology Forums. The most recent presentation was at the 2007 Forum in a session entitled "Migrating OpenVMS Storage Environments without Interruption or Disruption". The slides from that session are available at: http://www.rlgsc.com/hptechnologyforum/2007/1512.html
I always recommend care when doing any volume maintenance of this type. It is far easier to take precautions than it is to recover from a mistake. Also, since these changes can be done without disruption, I recommend that they be done gradually, not all in one step.
Lastly, I would not recommend experimenting on a production cluster. If this cluster is important, create a set of practice volumes and test the steps of the transition.
- Bob Gezelter, http://www.rlgsc.com
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тАО03-03-2009 01:49 AM
тАО03-03-2009 01:49 AM
Re: set vol/size=xxxx in vms
wise words already written by Bob.
All I can add is personal experience: it went so easily, so fast, so well!
At the migration to EVA storage, we took the opportunity to INIT the volumes to maximize potential size, and whenever the need arose, incresed the SAN storage, and executed SET VOLUME. After the first few times it was just routine.
hth
Proost.
Have one on me.
jpe
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тАО03-03-2009 05:07 AM
тАО03-03-2009 05:07 AM
Re: set vol/size=xxxx in vms
Both Bob and Jan omit mention of some considerations that can arise with DVE, though both do correctly point to the potential risks of testing in production.
Here's a write-up with a few of the land-mines that are known, and do ensure the box is current on its ECO kits:
http://64.223.189.234/node/207
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тАО03-03-2009 12:40 PM
тАО03-03-2009 12:40 PM
Re: set vol/size=xxxx in vms
"risk" depends on definitions, and the application itself.
The DVE mechanism is solid, and fairly well tested (though more so on a later versions of OpenVMS than you're running). We've expanded online volumes, on the fly, numerous times, without any problems (but I'm not sure we've done it on the most critical production systems).
However, if you want to guess at potential problems, look at the application. It's entirely possible there is an explicit or implicit assumption that disk size is static. For example, perhaps the application samples the volume size at startup? Perhaps a change in disk size could affect internal logic?
Try it on your test system first.
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тАО03-03-2009 12:48 PM
тАО03-03-2009 12:48 PM
Re: set vol/size=xxxx in vms
Andy Bustamante
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тАО03-03-2009 04:42 PM
тАО03-03-2009 04:42 PM
Re: set vol/size=xxxx in vms
thank you so much for help.
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тАО03-04-2009 12:16 PM
тАО03-04-2009 12:16 PM
Re: set vol/size=xxxx in vms
Bob Davidson