Vmnocbtcontinue
Use the vmnocbtcontinue option to specify whether to back up a virtual machine (VM) without using the change block tracking function when one or more snapshots already exist on the VM and change block tracking must be enabled or reset.
If you run an incremental-forever backup on a VM and change block tracking needs to be enabled or re-enabled, and one or more snapshots exist on the VM, change block tracking cannot be enabled. VMware does not support enabling change block tracking when a snapshot exists for the VM.
Ensure that you remove any existing snapshots before you run an incremental-forever backup for the first time so that change block tracking can be enabled. To proceed with the backup operation without enabling change block tracking, the vmnocbtcontinue yes option can be specified. However, running a backup operation with this option setting will cause each backup of the VM to be a full backup, which will include both used and unused blocks for each disk of the VM. After the backup operation is completed, when no snapshots exist on the VM, change block tracking is enabled and an incremental-forever backup is taken.
If you want to reset change block tracking for a VM or group of VMs, use the include.vmresetcbt vmname option. For more information, see Include.vmresetcbt.
This
feature is available only if the client operates as a data mover for IBM Spectrum Protect for Virtual Environments: Data Protection for VMware.
Supported Clients
This option can be used with supported Windows and Linux clients.
Options file
Place this option in the client options file (dsm.opt).
Syntax
Parameters
- No
- Fail the backup operation because change block tracking cannot be enabled. This value is the default.
- Yes
- Continue the backup operation without using change block tracking.
Specifying this value causes each backup of the VM to be a full backup that includes both used and unused blocks for each disk of the VM.