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07-10-2011 11:34 AM
07-10-2011 11:34 AM
Space Consumed By Snapshots?
I have a P4500 virtualisation SAN (14.4tb).
On it, amongst other volumes I have a pair of volumes for Exchange 2010, one for databases, one for logs.
The database volume is 500gb, the log volume is 100gb, both are full provisioned and both are network RAID 10.
My cluster utilization was running at 47%. I took an application aware snapshot of the Exchange volumes and the utilization immediately jumped up to 55%. I took another application aware snapshot right away and the utilization stayed at 55%. I then deleted both snapshots and it dropped to the original 47%. I took another snapshot and it climbed to 55%.
I'm not clear why this should be as I thought snapshots are thin provisioned so only consume space at the same rate as the volume grows, whilst this has obviously used 8% of the entire SAN capacity which under network RAID10 is around 450gb or so.
Thanks for any light you can shed.
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07-20-2011 06:45 AM
07-20-2011 06:45 AM
Re: Space Consumed By Snapshots?
I agree with you that logically it should work like that but I can't seem to find anything in the documentation that talks about application-managed snapshots should be thin provisioned. Do you have a Thin volume that you can take a application-managed snapshot?
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07-21-2011 11:29 AM
07-21-2011 11:29 AM
Re: Space Consumed By Snapshots?
Only a fully provisioned volume. I could change it to thin if it would help.
As a bit of a side question, is there any performance difference between thin and fully provisioned volumes or is the difference simply allocation of space up-front?
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07-23-2011 12:33 AM
07-23-2011 12:33 AM
Re: Space Consumed By Snapshots?
Snapshots are Thin Provisioned.
You would not see any appreciable difference is performance between Full Provisioned and Thin Provisioned Volumes.
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07-25-2011 07:02 AM
07-25-2011 07:02 AM
Re: Space Consumed By Snapshots?
Jitun,
I have ran the same test and not seeing that the snapshot is thin provisioned.
If I look at the property of a snapshot, yes, it says Thin. But when I take the application-managed snapshot it take exact same size out of my cluster as the size of the volume.
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07-25-2011 07:22 AM
07-25-2011 07:22 AM
Re: Space Consumed By Snapshots?
Jitun, as said, it certainly appears that whilst the subsequent snapshots are thin provisioned, and they all state thin in the CMC, the initial snapshot seems to take up an equal amount of space to the volume being snapshotted.
There's no other way the utilisation of a 5tb cluster can go from 48% to 55% just by taking a snapshot and then drop back to 48% by deleting it.
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07-25-2011 10:33 PM
07-25-2011 10:33 PM
Re: Space Consumed By Snapshots?
Snapshots are thin Provisioned on the SAN.
When you want to take a Backup of the Volume, out of SAN, then it should be an exact copy of the volume at that point of time. Which is the total size of the Volume.
@Paul
Initial Snapshot would always be the Size of the Volume when it is taken (Thin Provisioned), subsequent Snapshots are thin provisioned and only contains the Differential (changes since the previous snapshot was created)
I can have a look on your setup, you know how to reach me.
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07-26-2011 09:09 AM
07-26-2011 09:09 AM
Re: Space Consumed By Snapshots?
Paul Take the snspshot and then email me the Logs.
I will reply back with the answer.
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07-26-2011 10:13 AM
07-26-2011 10:13 AM
Re: Space Consumed By Snapshots?
@Jitun wrote:Paul Take the snspshot and then email me the Logs.
I will reply back with the answer.
Will do John, be tomorrow when I'm in the office. Do you want me to raise a ticket or just email them?
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07-26-2011 12:21 PM
07-26-2011 12:21 PM
Re: Space Consumed By Snapshots?
Just email is fine.
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