static. Therefore only differencing disk. This VHD files may grow the blocks which are increases CPU substantially which different from the utilization and disk I/O would minimize the parent need to be overhead. benefits of using this stored in the child disk configuration. differencing VHD. Reading from multiple VHD’s in this scenario incurs additional CPU and disk I/O overhead. Passthrough disks These are physical Requires a fully If your SQL Server disks which are set to dedicated disk or LUN instance is running on offline in the root in order for it to be a Hyper-V, you may partition and enable allocated to a virtual obtain incremental Hyper-V to have machine. performance exclusive read-write improvements by using A physical disk is more access to the physical passthrough disks over difficult to move disk. using fixed virtual hard between machines disks (VHD) for the than VHD files. BizTalk Server 2009 data volumes. If you are hosting local file receive locations on BizTalk Server 2009 or streaming large messages to disk during processing, you may obtain incremental performance improvements using passthrough disks over using fixed virtual hard disks (VHD). For more information about implementing disks and storage with Hyper-V see (http://go.microsoft.com/fwlink/?LinkID=142362).
static. Therefore only the blocks which are different from the parent need to be stored in the child differencing VHD. differencing disk. This increases CPU utilization and disk I/O overhead. VHD files may grow substantially which would minimize the benefits of using this disk configuration. Reading from multiple VHD’s in this scenario incurs additional CPU and disk I/O overhead. Passthrough disks These are physical disks which are set to offline in the root partition and enable Hyper-V to have exclusive read-write access to the physical disk. Requires a fully dedicated disk or LUN in order for it to be allocated to a virtual machine. A physical disk is more difficult to move between machines than VHD files. If your SQL Server instance is running on a Hyper-V, you may obtain incremental performance improvements by using passthrough disks over using fixed virtual hard disks (VHD) for the BizTalk Server 2009 data volumes. If you are hosting local file receive locations on BizTalk Server 2009 or streaming large messages to disk during processing, you may obtain incremental performance improvements using passthrough disks over using fixed virtual hard disks (VHD). For more information about implementing disks and storage with Hyper-V see (http://go.microsoft.com/fwlink/?LinkID=142362).
BTS09HyperV.docx