An EVA logical unit is referred to as a volume. An EVA
system can support up to 512 volumes. Volumes are created within a
set of physical disk drives, referred to as a disk group. A volume
is striped across all the drives in the group.
The minimum size of a disk group is eight physical drives.
The maximum size of a disk group is all available disk drives.
EVA volumes are created and deleted by using the Command View EVA utility.
Note: A volume is formatted during the creation process; therefore, the capacity of the volume
determines the length of time it takes to be created and formatted. Ensure that you wait until the
volume is created before you present it to the
system.
A single volume can consume the entire disk group capacity or the disk group can be used for
multiple volumes. The amount of disk group capacity that is consumed by a volume depends on the
volume capacity and the selected redundancy level. The system supports three redundancy levels:
- Vraid 1 - High redundancy (mirroring)
- Vraid 5 - Moderate redundancy (parity striping)
- Vraid 0 - No redundancy (striping)