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тАО04-01-2009 04:18 AM
тАО04-01-2009 04:18 AM
Is there an easy way to eliminate this problem? For example, can I use the same "World Wide Name" for the new snapshot each time? What is the recommended solution to this problem?
Solved! Go to Solution.
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тАО04-01-2009 06:42 AM
тАО04-01-2009 06:42 AM
Re: Using EVA snapshot/snapclone LUN with the same HP-UX v.11.31 agile disk name each time
When any SCSI hardware is changed the WWID will change as well. So you can try in using the World Wide Name
This implies to the tape drives as well
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тАО04-01-2009 07:35 AM
тАО04-01-2009 07:35 AM
Re: Using EVA snapshot/snapclone LUN with the same HP-UX v.11.31 agile disk name each time
Let the EVA create one or more value(s) once (be careful - do not try to 'invent' your own values!), save these value(s) in a table for later use and reapply them on new snapshots if needed.
Be careful and make sure that a single server never sees multiple vdisks/snapshots with the same LUN WWN.
Please let us know if it worked.
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тАО04-01-2009 10:23 PM
тАО04-01-2009 10:23 PM
Re: Using EVA snapshot/snapclone LUN with the same HP-UX v.11.31 agile disk name each time
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тАО04-01-2009 10:32 PM
тАО04-01-2009 10:32 PM
Re: Using EVA snapshot/snapclone LUN with the same HP-UX v.11.31 agile disk name each time
A number of operating systems are using the LUN WWN to identify multiple paths and/or differentiate between originals and snapshots/clones.
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тАО04-01-2009 10:43 PM
тАО04-01-2009 10:43 PM
Re: Using EVA snapshot/snapclone LUN with the same HP-UX v.11.31 agile disk name each time
An original disk (LUN) is presented with LUN id 16 on a host. So device names are like this:
# ioscan -m dsf
[...]
/dev/rdisk/disk60 /dev/rdsk/c9t2d0
/dev/rdsk/c11t2d0
/dev/rdsk/c7t2d0
/dev/rdsk/c5t2d0
[...]
A snapclone is created and presented with LUN id 20 on the same host. The device names for the clone become something like this:
# ioscan -m dsf
[...]
/dev/rdisk/disk71 /dev/rdsk/c5t2d4
/dev/rdsk/c11t2d4
/dev/rdsk/c9t2d4
/dev/rdsk/c7t2d4
[...]
Then, the clone is deleted and re-created and presented with LUN id 20 (again) on the same host. The "legacy" device names remain the same (/dev/rdsk/c?t2d4). However the "agile" device name will change to something like /dev/rdisk/disk77. And so on, and so on...
I do NOT want the agile addressed device name (/dev/rdisk/dis71) to change each time I re-create the snapclone.
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тАО04-01-2009 11:48 PM
тАО04-01-2009 11:48 PM
SolutionIn that case, yes, I do beleive that reusing the same value for new snapshots is the best way. I would not attempt to fiddle with mapping files withing HP-UX unless this is explicitly documented and supported by HP.