Reading has changed the blocks?

I'm stuck on how to read the actual changed blocks of a host/vC.

I called QueryChangedDiskAreas and return a list of (start, length)-this seems to be the current byte offsets.

In looking at VixDiskLib_Read() it seems entered sector.

/**
* Reads a string of sector.
@param diskHandle [in] handle to an open virtual disk.
@param startSector [en] absolute offset.
@param numSectors [in] number of sectors to read.
@param readBuffer [out] buffer to read into.
* @return VIX_OK if successful, suitable VIX otherwise error code.
*/
VixError
VixDiskLib_Read (VixDiskLibHandle, diskHandle,
VixDiskLibSectorType startSector,
VixDiskLibSectorType numSectors,
UInt8 * readBuffer);

How to merge these two concepts in the possibility of obtaining the actual modified bytes of virtual machine?

Is it only bad design/documentation of the API and the 'sector' is really a byte (VixDiskLibSectorType is after all a uint64)?


Thank you

Richard.

Hi Richard,

I just don't have access to the VDDK header files, but if I remember correctly it VIXDISKLIB_SECTOR_SIZE is defined in vixDiskLib.h. Currently, sector size is 512 bytes. So to convert the lengths and the sectors byte offsets, you need to calculate as follows:

bytes/VIXDISKLIB_SECTOR_SIZE

and you should be fine :-)

Hope this helps

Tags: VMware

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