To summarize, changeID is an identifier for a time in the past. DiskChangeInfo data object containing a description of the area of the disk covered start offset and length , and an array of VirtualMachine.
The easiest way to enable CBT is by using vSphere client. Without CBT these applications have to figure out changed blocks on their own so being able to get this information for free using the vStorage advanced programming interfaces is extremely valuable to them. Compute Resource — A Compute Resource is basically hardware. Also, a thick eager zero provisioned VMDK returns a single extent covering the entire disk because all blocks are allocated and zeroed.
Technote FAQ This document applies only to the following language version s: A new ChangeId results every time someone creates a snapshot. All in-use sectors of the disk.
Read the latest tech blogs written by experienced community members. This section describes the low level details that are helpful in actually coding a backup application. Your email address will not be published. Limitations for CBT: When you find such an entry, examine the BackingInfo property.
While this is the default in vSphere you can still choose the old version 4 hardware that was used in VMware Infrastructure 3, if you upgraded a host from ESX 3 to ESX 4 you must also upgrade the virtual hardware of the VMs to version 7 to use this feature. Google Analytics Client ID.
In either Polling or Waiting, it is first necessary to register your FilterSpec array object with the PropertyCollector. Forgot Password No problem! The result is either a partial list containing only the changes from the previous version including a new version number , or a return code indicating no data has changed.
The only difference is in the managed object that we use to extract the information.
Go to original post. PathSet — An array of strings containing names of properties to be returned, including nested properties. It can be enabled either through the vSphere client or by using the SDK. Delete the snapshot when your backup has completed.
The following code sample assumes that, in the past, you obtained a complete copy of the virtual disk, and at the time when the changeId associated with the snapshot was collected, you stored it for use at a later time, which is now. Welcome to TechTarget's expert community for technology professionals. Since a PropertyFilterUpdate entry is very generic, here is some code showing how to extract information from the PropertyFilterUpdate.
The PropertyCollector uses two relatively complicated argument structures. Once the PropertyCollector has a moRef , it can then return the properties associated with that moRef.