Snapshot allocation problem

[Antonio Gonzalez_4]

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.

[Sameer_Nirmal]

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

[Antonio Gonzalez_4]

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

[Ivan Ferreira]

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?