Hey Everyone,

VMware has recently rolled out the newest iteration of ESXi, version 8.0.2b. Among its fixes of fixes and enhancements, one particular fix should be called out: addressing an issue related to Changed Block Tracking (CBT) and virtual machines with a hot extended virtual disk.  

In vSphere 8.0 Update 2, to optimize the open and close process of virtual disks during hot extension, the disk remains open during hot extend operations. Due to this change, incremental backup of virtual disks with CBT enabled might be incomplete, because the CBT in-memory bitmap does not resize, and CBT cannot record the changes to the extended disk block. As a result, when you try to restore a VM from an incremental backup of virtual disks with CBT, the VM might fail to start.

For more information and to get the bits, head over to the release notes page of 8.0.2b.