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newbie - help please on Virtual copies https://3parug.org/viewtopic.php?f=18&t=806	Page 1 of 1

Author:	yermaw [ Wed Jul 09, 2014 6:33 am ]
Post subject:	newbie - help please on Virtual copies
hi, I am getting deeper every day in 3par work , and today's ( I mean this minute's) challenge is to take a Virtual copy of a physical copy( for a set of volumes ) scenario 8 luns in a set, have a physical copy of each one, again, in a set. we need to createvvcxopy -r on the set each night ( this takes a few hours to complete after the initial snapshot ) we then need to take a Virtual copy of the Physical Copy set and present this set to our backup server. so we run the updatevv -f set:Virt_copy_set Question: can I take a virtual copy of the physical copy while the physical copy re-synch is in progress, or do I need to wait til it finishes to be able to guarantee a consistent backup can be taken of the LUNS ?? many thanks in advance.

Author:	Cleanur [ Thu Jul 10, 2014 8:54 am ]
Post subject:	Re: newbie - help please on Virtual copies
You'll need to wait for the resync to complete in order to get a consistent PIT copy. And no you can't take a virtual copy of the physical copy during the resync, hoping for it to be updated with the copy on write changes made during the resync because the snapshot is a point in time, so any changes to the source made after the snap event will not be recorded in the snap. To be honest I wouldn't even bother with physical copies they provide pretty much zero benefit vs snapshots in a wide striped array and are only really kept around for legacy purposes. Just take a snapshot and you have zero capacity overhead and no wait time, all the disks are shared anyway even on a physical copy.

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