![]() In case the Change Block Tracking feature is enabled on the ESXi server and is enabled by the user in a VMware backup plan, Backup for Windows attempts to enable it on every backup plan run. vSphere Version 7 virtual hardware or higher VM hardware compatibility: ESXi.Note that the Changed Block Tracking feature requires the following hardware and software installed: This is due to some load that CBT puts on the server CPU. Now Changed Block Tracking in VMware vSphere is part of the vStorage APIs for Data Protection (VADP), which consists of two components VDDK (Virtual Disk Development Kit) and vSphere SDK.Ĭhanged Block Tracking works at the level of the storage stack in the VMkernel module and allows third-party backup products to return a list of changed blocks since the last backup.ĬBT can be used for any type of virtual disks, including VMFS/FS/iSCSI and NAS/NFS volumes, except for Raw Device Mapping (RDM) volumes in physical compatibility mode and disks mapped to a shared virtual SCSI bus.īy default, the Changed Block Tracking feature is disabled on VMware ESX servers. CBT mechanism tracks changes in a special Changed Block Tracking log file. The main advantage of Changed Block Tracking is a significant saving of backup time for incremental backups. The absence of Changed Block Tracking caused a significant load on the ESX 3.x servers since there was no built-in mechanism for tracking changed blocks. ![]() This technology is derived from the VMware Data Protection API which allows third-party backup applications to take advantage of CBT to perform backups. This chapter covers the following topics:įor modern VMware backup solutions, VMware introduced in ESXi 4.0 a technology called Changed Block Tracking or CBT to facilitate taking incremental backups of virtual machines. Changed Block Tracking for Hyper-V and VMware BackupsĬhanged Block Tracking is a feature that allows reading only blocks of a virtual machine disk that have changed since a certain point in time. ![]()
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