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EVA 4000 snapshot allocation behaviour

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Maxitaly_1
Advisor

EVA 4000 snapshot allocation behaviour

Hi all
Configuration:
- EVA4000 2C2D (21 disk 146 HPFC total)
- XCS 5.100
- 1 disk group

I've created in 3 different days 3 snapshot (not allocated)
for a vdisk (200 GB vraid5): snap1, snap2, snap3 (snap3 is the oldest).
The vdisk is presented to a Windows 2003 server SP1.
Verifying the space allocated for each snapshot I found this values:
snap1:
allocatedcapacity ....................: 37
allocatedcapacityblocks ..............: 77709312
snap2:
allocatedcapacity ....................: 46
allocatedcapacityblocks ..............: 98074624
snap3:
allocatedcapacity ....................: 5
allocatedcapacityblocks ..............: 12419072

The day after (snap3 deleted, snap2 renamed to snap3, snap1 renamed to snap2,
snap1 new snapshot):
snap1:
allocatedcapacity ....................: 1
allocatedcapacityblocks ..............: 2473984
snap2:
allocatedcapacity ....................: 47
allocatedcapacityblocks ..............: 98664448
snap3:
allocatedcapacity ....................: 46
allocatedcapacityblocks ..............: 98074624

Is this behaviour correct ?
It's possible that the oldest one is smaller ?

Thanks
Armando

3 REPLIES
Maxitaly_1
Advisor

Re: EVA 4000 snapshot allocation behaviour

Hi
nobody has never seen this behaviour ?

Thanks
The Spartan
Trusted Contributor
Solution

Re: EVA 4000 snapshot allocation behaviour

Is this behaviour correct ?
Yes

The size of the snapshot is a function of the status of the data at the time of snapshot and not a function of time.

If you are keen to win, you should be willing to lose.
GZito
Occasional Visitor

Re: EVA 4000 snapshot allocation behaviour

Armando,

I'm running 3 snapshots against a vdisk and I expect the old one to be the biggest, but it's not the case.
So basically I'm experiencing the same behaviour you have

EVA 6000 VCS 5.031, using RSM 2 to create Snapshots

Is there anyone that could give us a correct answer ?

Thanks
Giuseppe