Supported RAID Types
Supported and default RAID types are as follows:
RAID 0, 1, 5, 6, 10, 50, or 60
For 2-socket EPPs, the base configuration is two 300 GB disks configured as RAID 1.
For 4-socket EPPs, the base configuration is two 300 GB disks configured as RAID 1.
RAID Groups
A RAID group is a set of associated storage drives having a single RAID type. One or more LUNs (virtual disks) are assigned to the RAID group. All LUNs in the RAID group are distributed equally across all the storage drives. The RAID group type determines how many storage disks you can have in a RAID group.
This release supports up to 30 enabled partition images (depending on the EPP type). However, because s-Par consumes 5 LUNs, there are only 11 user LUNs available in the base configuration RAID group. Therefore, to support 30 enabled partition images (or any combination of enabled and disabled partition images exceeding 11), you must have multiple RAID groups.
How RAID Groups Are Established
The desired number of RAID groups are established as follows:
During the ordering process, the customer specifies the number of RAID groups that are desired.
For each RAID group, the customer specifies
The internal storage drive type
The number of internal storage drives that are desired (in increments that support the defined RAID type)
The RAID type (RAID 0, 1, 5, 6, 10, 50, or 60)
The Unisys factory sets up EPPs with the desired type and number of SAS drives, with the desired RAID configuration.
When your ClearPath Forward fabric is installed, the Unisys service representative works with the customer to configure
The number of LUNs (partition image virtual disks) that you desire per RAID group
The size of each LUN
If in the future you wish to make any changes to RAID groups, these changes are performed by the Unisys service representative.
Rules for RAID Groups
Rules for RAID groups are as follows:
All SAS storage drives are configured in RAID pairs. Storage drives are purchased in increments that support the type of RAID that you order. For example, RAID 10 requires at least four drives. RAID 1 requires at least two drives.
Each RAID group (excluding the RAID group in the base configuration) is configured with up to 16 LUNs that are available for partitions.
All storage drives in a RAID group must be the same type and disk capacity.