Write Sectors To a Disk
VixDiskLib_Write() writes one or more sectors to an open virtual disk. This function expects the fourth parameter buf to be VIXDISKLIB_SECTOR_SIZE bytes long.
vixError = VixDiskLib_Write(newDisk.Handle(), i, j, buf);
In vSphere 6.7 and later, you can improve performance of NBD transport with asynchronous writes. Your program VixDiskLib_WriteAsync in a loop, then calls VixDiskLib_Wait to let all asynchronous writes complete.
// customized callback for complete notification void myDiskLibCompletion(void *cbData, VixError result); // a loop for multiple write requests for (...) vixError = VixDiskLib_WriteAsync(newDisk.Handle(), i, j, buf, myDiskLibCompletion, cbData); if (vixError != VIX_ASYNC) { // handle error } } VixDiskLib_Wait(newDisk.Handle()); // wait for async write to complete