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VSS took snapshots with Data Ontap VSS provider after netbackup service restart

Created: 20 Nov. 2012

Hi,
I have a problem with some of production servers that installed snapdrive and netbackup.

Whent I restart the netbackup services, it calls VSS and Data Ontap VSS provider, then Data Ontap VSS provider starts to take snapshots of RDM disks one by one and mount on the Virtual machine, and destroy it and unmount disk, it repeats until VSS timeout about 2 days!!
But some of disks are destroyed but not unmounted, and it is big problem.

Netbackup Version: 7.5.0.4
Vsphere Version 5 U1
Snapdrive version 6.4

I tried to select "system Provider"  with command "w2koption -backup -snapshotprovidertype 1" but nothing changed.

Related Logs:
11/20/2012 9:42:31 AM -> NetBackup -> Service started.
11/20/2012 9:42:31 AM -> NetBackup Legacy Client Service -> NetBackup Legacy Client Service has been started
11/20/2012 9:42:35 AM -> Service Control Manager -> The Volume Shadow Copy service entered the running state.
11/20/2012 9:42:36 AM -> Service Control Manager -> The Microsoft Software Shadow Copy Provider service entered the running state.
11/20/2012 9:42:37 AM -> Service Control Manager -> The Data ONTAP VSS Hardware Provider service entered the running state.
11/20/2012 9:42:37 AM -> Navssprv -> Data ONTAP VSS hardware provider is adding a source lun [VendorId=NETAPP, ProductId=LUN, SerialNo=7S7Ah?ApyFTY] to SnapshotSetId {30171fda-b2f3-47db-9a54-718144362ec4}.
11/20/2012 9:42:38 AM -> SnapDrive -> SnapDrive is ready to create Snapshot copy ({30171fda-b2f3-47db-9a54-718144362ec4}) of LUN(s).
11/20/2012 9:42:42 AM -> Navssprv -> Data ONTAP VSS hardware provider has successfully completed CommitSnapshots for SnapshotSetId {30171fda-b2f3-47db-9a54-718144362ec4} in 3230 milliseconds.
11/20/2012 9:44:08 AM -> SnapDrive -> CreateTargetLun failed.
...
Errors
...
Create and mount snapshot again
...
errors
...
Create and mount snapshot again
..
so on, until VSS timeout
-> VSS -> The VSS service is shutting down due to idle timeout.
-> Navssprv -> Data ONTAP VSS hardware provider is unloaded.