Users Guide

Storage Solutions Guide 33
checkpoint is taken, a differencing disk is created for all VHDs assigned to the
VM. The disk space required for the checkpoint files depends upon the
frequency checkpoints are created, the rate of change of data, and the amount
of memory assigned to the virtual machine.
Sizing for Passthrough Disks
The sizing requirements for passthrough disks are similar to VHDs with the
following differences:
• A separate NTFS partition must be available for the parent partition to
utilize for placement of the VM configuration files. The partition/volume
should not be shared with other data or VMs.
• The parent partition does not manage the disk; therefore, allocating
additional disk space to avoid error messages is not required.
• Additional storage for VM checkpoints is not required (passthrough disks
do not support the use of checkpoints).
Figure 15. Passthrough Disk