Win 2008 Cluster issues (The base volume for the path [g:\usr\sap\egp\ascs01\exe] is unavailable or offline. Please ensure all volumes are online for backup operations)

A - Physical node

B- physical node

C - Virtual node

D - Virtual node

arch: Windows Server 2008 R2;

                 kernel arch: AMD_X8664;

                    CPU type: AMD_X8664;

                machine type: server;

                          OS: Windows Server 2008 R2 6.1;

           NetWorker version: 8.1.1.6.Build.321;

              client OS type: Windows NT Server on Intel;

                        CPUs: 24;

it is with NMM 3.0.SP!

This is active-active cluster.

So both nodes one resource will be running.

For resources also C (virtual node) will take care of sql server and D(Virtual node)  will take care of the SAP  application.

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When we run the backup with saveset ALL  for the physical node A: the backup failed as below for all the drives on physical node A,

* A:DISASTER_RECOVERY:\ 88224:save: The base volume for the path is unavailable or offline.  Please ensure all volumes are online for backup operations.

* A:DISASTER_RECOVERY:\ 88222:save: Could not add for backup.

* amdn1890.d30.intra:DISASTER_RECOVERY:\ WINDOWS ROLES AND FEATURES: ERROR: VSS failed to add components in pre save, writer=System Writer: The system cannot find the file specified. (Win32 error 0x80070002)

*A:DISASTER_RECOVERY:\ 98193:save: Unable to save the SYSTEM STATE save sets: cannot add all the system state writers to the snapshot.

* A:DISASTER_RECOVERY:\

* A:DISASTER_RECOVERY:\ 86024:save: Error occured while saving disaster recovery save sets.

     * :  Failed with error(s)

* A:W:\ 88224:save: The base volume for the path is unavailable or offline.  Please ensure all volumes are online for backup operations.

*A:W:\ 88222:save: Could not add for backup.

* A:W:\ WINDOWS ROLES AND FEATURES: ERROR: VSS failed to add components in pre save, writer=System Writer: The system cannot find the file specified. (Win32 error 0x80070002)

* A:W:\ 98193:save: Unable to save the SYSTEM STATE save sets: cannot add all the system state writers to the snapshot.

* A:W:\

* A:W:\ 94693:save: The backup of save set 'W:\' failed.

     * :  Failed with error(s)

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The backup fails with only version 8.1.1.6 , earlier to this we used 7.6 and it was working fine.

Backups are successful after excluding the same in Registry files, we would like to know is this something related to networker or Microsoft.

Who should sort this out.

Please reach me on kishore223@gmail.com...for any clarifications.