topic Re: Whether QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() both return the entire disk in Technical Community Resources and Help Discussions

Whether QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() both return the entire disk?

hwangwenchao — Fri, 09 Sep 2022 09:52:47 GMT

I'm backing up a virtual machine's disk in NFS storage on a vCenter 7.0.3u3. When I use QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() to query the disk's changed data, it returns the data of the entire disk, and many of its data may be 0, I don't need these 0 data, what should I do to know which data is really useful? please help me?

Re: Whether QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() both return the entire disk

scott28tt — Mon, 12 Sep 2022 12:49:54 GMT

Which SDK or API does this relate to?

Re: Whether QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() both return the entire disk

hwangwenchao — Tue, 13 Sep 2022 01:25:57 GMT

hi, scott28tt, thanks for your reply!QueryDiskChangedArea() is the interface of the called Mob, the current version is 7.0.3 u3, and VixDiskLib_QueryAllocatedBlocks() is the interface of VixDiskLib, the version is 7.0.0

Re: Whether QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() both return the entire disk

scott28tt — Tue, 13 Sep 2022 08:40:55 GMT

Your post needs moving, but I'm not sure where to within the Communities, I've reported it to the moderators.

Re: Whether QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() both return the entire disk

hwangwenchao — Tue, 20 Sep 2022 10:04:14 GMT

It should be the development of disaster recovery software belonging to vmware, so can I solve the problem I raised?

Re: Whether QueryDiskChangedArea() and VixDiskLib_QueryAllocatedBlocks() both return the entire disk

sluge — Mon, 17 Apr 2023 05:32:44 GMT

It occured due to this:

Virtual Disk Development Kit Programming Guide:

One limitation is that VixDiskLib_QueryAllocatedBlocks returns the whole VMDK for NFS, rather
than just the allocated blocks as for VMFS, vSAN, and VVol datastores.