Hyper-v Backup failing with Snapshot error 156

[Hannible]

Hello friends,

we have Netbackup Master server on Windows 8 R2

and client machine is a virtual server on Hyper-v which is failing with below error.. 

what possible could be the reason..?? and how to solve it..??

06/18/2014 04:10:36 - end Hyper-V: Step By Condition; elapsed time 0:00:00
Operation Status: 0
06/18/2014 04:10:36 - end Parent Job; elapsed time 0:00:01
06/18/2014 04:10:36 - begin Hyper-V: Create Snapshot
06/18/2014 04:10:39 - started process bpbrm (pid=7908)
06/18/2014 04:10:47 - Info bpbrm (pid=7908) TMLEPO1.tmindia.tatamotors.com is the host to backup data from
06/18/2014 04:10:47 - Info bpbrm (pid=7908) reading file list from client
06/18/2014 04:10:47 - Info bpbrm (pid=7908) start bpfis on client
06/18/2014 04:10:47 - Info bpbrm (pid=7908) Starting create snapshot processing
06/18/2014 04:10:49 - Info bpfis (pid=6856) Backup started
06/18/2014 04:10:52 - Critical bpbrm (pid=7908) from client TMLEPO1.tmindia.tatamotors.com: FTL - snapshot preparation failed, status 156
06/18/2014 04:10:52 - Warning bpbrm (pid=7908) from client TMLEPO1.tmindia.tatamotors.com: WRN - ALL_LOCAL_DRIVES is not frozen
06/18/2014 04:10:52 - end writing
Operation Status: 156

[RamNagalla]

Critical bpbrm (pid=7908) from client TMLEPO1.tmindia.tatamotors.com: FTL - snapshot preparation failed, status 156

best place to start from the Hyper-V server.. looks like its failed to create the snaphost.. check the the hyper-V server for the reason and try to fix that.. 

[Michael_G_Ander]

The bpfis log contains information about snapshots, is unsure if it will be on the hyper-v host or on the backup host is this case.

[sri_vani · Accepted solution]

As suggested please verify the bpfis,event viewerand  post us the details

Please have a look at this below link

http://www.symantec.com/business/support/index?page=content&id=TECH152313

There are two possible solutions to this issue:

1. Open the Hyper-V policy in the NetBackup Administrators Console and click the Options button under Snapshot Client on the Attributes tab.  Change the "Allow Offline Backup of VM" option to Yes, or
2. Resolve the situation with the virtual machine(s) that causes Microsoft to place it into a 'Saved' state.  This could involve making changes to the virtual machine configuration.