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Rick80's avatar
Rick80
Level 4
9 years ago

cbt enabled by Netbackup?

Hi all,

 

I have a question about Accelerator and cbt option on vm machine.

This option is disabled, Can Netbackup enabled automatically if I have accelerator on vmware policy? And in this cas NETBACKUP poweroff vm?

 

Thanks a lot

 

 

 

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  • sdo's avatar
    sdo
    9 years ago

    NetBackup will not power-off the VM if/when it enables CBT.

    The next VM stun/unstun cycle will effectively enable CBT.

    A 'snapshot' event is a 'stun/unstun' event.

    http://itknowledgeexchange.techtarget.com/virtualization-pro/what-is-changed-block-tracking-in-vsphere/

    So, NetBackup will call the VMware API SDK to enable CBT, and then NetBackup will call the VMware API SDK to take a snapshot which will stun/unstun the VM.

    So, NetBackup will not stop/restart the VM, and there should be no need to stop/restart the VM.

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  • nbutech's avatar
    nbutech
    Level 6
    9 years ago

    Please check this technote and see if this answers your queries

    Accelerator notes and requirements for virtual machines

    https://www.veritas.com/support/en_US/article.HOWTO92075

     

     

  • sdo's avatar
    sdo
    Moderator
    9 years ago

    Yes, NetBackup will auto-enable CBT for the VM being backed-up... IF... the backup policy has block level incremental selected:

    https://www.veritas.com/community/blogs/nuts-and-bolts-netbackup-vmware-avoiding-cbt-penalty-netbackup-accelerator

     

  • Rick80's avatar
    Rick80
    Level 4
    9 years ago

    Hi sdo,

    ok and without restart vm?

    Thanks a lot

     

    Rick

     

     

  • sdo's avatar
    sdo
    Moderator
    9 years ago

    NetBackup will not power-off the VM if/when it enables CBT.

    The next VM stun/unstun cycle will effectively enable CBT.

    A 'snapshot' event is a 'stun/unstun' event.

    http://itknowledgeexchange.techtarget.com/virtualization-pro/what-is-changed-block-tracking-in-vsphere/

    So, NetBackup will call the VMware API SDK to enable CBT, and then NetBackup will call the VMware API SDK to take a snapshot which will stun/unstun the VM.

    So, NetBackup will not stop/restart the VM, and there should be no need to stop/restart the VM.
  • Rick80's avatar
    Rick80
    Level 4
    9 years ago

    Hi STO,

    Very good, but when backup is ended and snapshot was deleted, does it mean the cbt was disabled e re-enabled in the next snapshot?

     

    Thanks a lot

     

    Rick

  • sdo's avatar
    sdo
    Moderator
    9 years ago

    Once CBT has been configured for the VM, and then also effectively switched on by a stun/unstun event, then CBT will remain enabled.