Hitachi Adaptable Modular Storage 2000 Best Practices Manual page 15

Shared VHD Deployment
This scenario utilizes a shared VHD disk, with that single VHD disk hosting multiple child partitions. Figure 3
shows a scenario where Exchange and SQL child partitions share a VHD disk on a 2000 family storage system
and SharePoint and BizTalk child partitions also share a VHD disk on the 2000 family storage system.
Shared VHD Connection
Figure 3.
Key considerations:
• It is important to understand the workloads of individual child partitions when hosting them on a single shared
VHD. It is critical to ensure that the RAID group on the 2000 family storage system that is to host the shared
VHD LU can support the aggregate workload of the child partitions.
For more information, see the "Number of Child Partitions per VHD, per RAID Group" section of this paper.
• If using quick migration to move a child partition, understand that all child partitions hosted within a shared
VHD move together. Whether the outage is due to automated recovery from a problem with the child partition
or because of a planned outage, all the child partitions in the group are moved.
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