topic Re: Snapshot allocation problem in HPE EVA Storage

Snapshot allocation problem

Antonio Gonzalez_4 — Sat, 21 Apr 2007 08:08:08 GMT

We have created a new snapshot using RSM 2.0
We use "allocation on demand"
The original vdisk is 400GB.
Just after the snapshot creation without any user activity the allocated space for the snapshot is 70GB. This happens every day.
The snapshot is mounted on a W2000 server and read it by a veritas netbackup job.

We have an EVA 3000, CV 6.0.2.37, fw VCS 3028

We have a second snapshot for a development vdisk with 20GB size, and the behaviour is normal, the allocated snapshot size after creation and no user activity is 0GB.

In both cases, the commands used to create the snapshot are:
//
$Rep1 = SnapshotDiskDevice ( $source_disk_device_unc1, DEMAND_ALLOCATED, RAID0, $dest_storvol1, WAIT )
CreateDiskDevice ( $Rep1, $mount_host, 7, READ_WRITE )
//

Any clue on that?
Thanks
Antonio.

Re: Snapshot allocation problem

Sameer_Nirmal — Sat, 21 Apr 2007 12:42:49 GMT

Did you check the logs?
Server event and trace logs and RSM trace log?

Re: Snapshot allocation problem

Antonio Gonzalez_4 — Sun, 22 Apr 2007 05:30:15 GMT

Sameer, as far as I know, all the RSM activity is OK. Allocation has nothing to do with RSM, just VCS. I presume the same problem will happend w/o using RSM at all.
am'I right?

BTW, the VCS is 3100, not 3028.

regards
antonio

Re: Snapshot allocation problem

Ivan Ferreira — Sun, 22 Apr 2007 09:07:04 GMT

How quick you see the 70 GB used? Is there a possibility that the changes are generated by another application, like a virus scanner, volume shadow, etc?