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34 Posts
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929
February 19th, 2014 08:00
VP snap device allocation
I am trying to determine he amount of space typically occupied by by VP SNAP / VSE clone devices on a VMAX, at this point all i am looking for is a ball park worst case figure. i.e at 5am we had 7 TB allocated.
Obviously I know the size of the clone TDEVs but ideally I’m looking for something that details when a clone session was activated, when it was terminated and the TDEV allocation size when it was terminated. Is this information recorded anywhere or would I need to poll every clone TDEV to get it?
The devices in question are not in their own pool so just tracking pool capacity does not give an accurate figure
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Patrick_van_Goo
2 Posts
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February 20th, 2014 00:00
Hi
I'd like to see this answered also. We are making , a lot , of VPSnaps of LUNs, they aren't in a seperate pool and we would very much like to know how much space they are really allocating within the pool. Although all 'flyers', presentations mentioning VPSnaps 'space-efficient' benefits it nowhere states 'how' you can easily report on the snaps actual space allocation within the pool.
Kind regards
Patrick
M_Salem
213 Posts
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February 20th, 2014 01:00
There are no commands that will help you to do that other than normal symcfg commands for TDEVs
so if you run symcfg -sid xxx list -tdev -range xxx:xxx this will give the allocated tracks for your VP SNAPs.
To get the amount of your shared tracks "that is the idea of VP Snaps" then you will need to run symcfg -sid xx show -pool -thin -detail -all | more
The output should look something like this:
# of Tracks saved by compression : 0
There is a very useful whitepaper from support.emc.com describing the VP snaps with detailed explanation.
https://support.emc.com/docu40346_White_Paper:_Implementing_TimeFinder_VP_SNAP_for_Local_Replication.pdf?language=en_US
chirswilson
34 Posts
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February 20th, 2014 13:00
Hi Patrick,
Having had another look around
Within Unisphere -> Performance -> Analyze There is a Storage Group counter "total tracks", this appear to be the actual allocated tracks to the SG as opposed to the sum of all tdev sizes.
As all our clones are assigned to backup servers this gives an idea of what is going on, i can certainly see the counters climb an fall as i would expect on activation and termination. I can't as yet find a counter that show me this data for each tdev.
Patrick_van_Goo
2 Posts
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February 24th, 2014 05:00
Hi Guys,
Thanks for your support and reply, still not a 1,2,3 in terms of getting a quick overview on allocated storage used by the VP Snaps. Also caused by the way we use it i guess. But you pointed me into the right direction.
Thanks.
Kind regards
Patrick