12-30-2015 04:32 AM
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
Solved! Go to Solution.
12-30-2015 05:46 AM
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.12-30-2015 05:17 AM
Please check this technote and see if this answers your queries
https://www.veritas.com/support/en_US/article.HOWTO92075
12-30-2015 05:28 AM
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
12-30-2015 05:30 AM
Hi sdo,
ok and without restart vm?
Thanks a lot
Rick
12-30-2015 05:46 AM
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.12-30-2015 05:50 AM
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
12-30-2015 05:59 AM
Once CBT has been configured for the VM, and then also effectively switched on by a stun/unstun event, then CBT will remain enabled.