Citrix Provisioning does not support VHD based vDisks on 4K storage in any Citrix Provisioning product version. Microsoft's VHD file specification only supports a disk logical sector size of 512 bytes. A read/write access VHD on 4K disk will trigger read-modify-write emulation, which results in sub-optimal streaming performance and basic vDisk maintenance errors. For example, during vDisk version promotion, you may see the console error, Error: 0x00000057 - Invalid Parameter.
vDisk Sizing and Storage Guideline:
1. VHD [logical sector size 512] must be on storage with 512 logical sector size. No RMW.
2. VHD [logical sector size 512] does not support storage with 4096 logical sector size. PVS has not implemented RMW for performance reasons.
3. VHDX [logical sector size 512] can be on storage with 512 logical sector size. No RMW.
4. VHDX [logical sector size 512] can be on storage with logical sector size 4096. PVS implements RMW if necessary. vDisk Logical sector size must match Master Target Device hard disk.
UEFI Targets Only:
5. VHDX [logical sector size 4096] can be on storage with 512 or 4096 logical sector size. No RMW.