A volume consists of multiple disks in a storage array that RAID is applied to.

Multiple datastores can be created on a single volume, but for applications that do not have a high I/O footprint a single volume with multiple datastores is sufficient.

  • For high I/O applications, such as backup applications, use a dedicated volume to avoid performance issues.

  • For other applications, set up Storage I/O Control (SIOC) to impose limits on high I/O applications so that other applications get the I/O they are requesting.

Table 1. Volume Assignment Design Decisions

Decision ID

Design Decision

Design Justification

Design Implication


Use a dedicated NFS volume to support backup requirements.

The backup and restore process is I/O intensive. Using a dedicated NFS volume ensures that the process does not impact the performance of other management components.

Dedicated volumes add management overhead to storage administrators. Dedicated volumes might use more disks, depending on the array and type of RAID.


Use a shared volume for other management component datastores.

Non-backup related management applications can share a common volume due to the lower I/O profile of these applications.

Enough storage space for shared volumes and their associated application data must be available.