Note: the first backup that is performed after restoring the CBT is a full backup. If you use a backup application that uses the Changed Block Tracking feature (see: Backup of ESXi, vCenter, ESXi Free and Replica with Iperius Backup), you must reactivate the CBT manually.In vSphere Web Client, right click on the virtual machine and click on Power -» Power On.Delete the -CTK.VMDK files in the virtual machine folder.Make sure there are no snapshot files (.delta.vmdk) present in the virtual machine folder.Access the folder on the datastore that contains the virtual machine (right click on the datastore and then on “Browse Datastore”).Disable CBT for individual virtual disks connected to the virtual machine by setting the scsix: x.ctkEnabled value for each virtual disk connected to FALSE (where scsix: x is the SCSI controller and SCSI device ID of the virtual disk).Disable CBT for the virtual machine by setting the ctkEnabled value to FALSE.Click on the Options tab (VM Options), select the General section and then click on Configuration Parameters -» “Edit configuration”.Right-click on the virtual machine and click Edit Settings.If there are snapshots, consolidate them. Right-click on the virtual machine, click on Manage Snapshots.Right-click on the virtual machine and click on Power Off.To reset CBT on a vSphere virtual machine, follow the following steps: Determine if there are any delta files left or snapshots that VMware vSphere cannot detect.Note: before performing this procedure, you must make sure that the virtual machine is not running on a snapshot.įor more information, see the related VMware articles: See also: Backup ESXi, vCenter, ESXi Free and Replication with Iperius Additionally, the backup procedures performed using CBT allows us to have multiple recovery points of a VM, based on the number of backups we have configured. ![]() This increases performance and optimizes the space required. This function is called Changed Block Tracking (CBT) and allows each backup procedure to download only those parts of the VM disk that have actually been modified since the last backup. Virtual machines running on ESXi hosts can keep track of disk sectors that have changed. In this brief tutorial we show the simple steps to reset the Changed Block Tracking (CBT) for vSphere virtual machines.ĬBT is a fundamental parameter withing a VMware ESXi virtual machine, since it allows, when enabled, us to perform incremental and differential backups of VMware virtual machines.
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