HP XP7 Storage - Manual (Page 39)

Boundary values for RAID levels
Boundary values of external volumes are always one slot, regardless of RAID levels.
Boundary value (KB) Emulation type
RAID 6 (14D+2P) RAID 6 (6D+2P) RAID 5 (7D+1P) RAID 5 (3D+1P) RAID 1 (2D+2D)
6,496 2,784 3,248 1,392 928 3390-xx
Notes:
• xx indicates one or more numbers or letters.
•
Boundary values are expressed in kilobytes.
•
Boundary values are of external volumes are always one kilobyte, regardless of RAID levels.
• Hyphen (-) indicates that the combination is not supported.
Capacity of a slot
Capacity (KB) of a slot Emulation type
58 3390-xx
Notes:
•
xx indicates one or more numbers or letters.
•
Slot capacity is expressed in kilobytes.
Configuring volumes in a parity group
For RAID 5 (7D+1P), RAID 6 (6D+2P), or RAID 6 (14D+2P) a maximum of 2,048 fixed-size volumes
(FVs) and a certain amount of free space are available in one parity group. For other RAID levels,
a maximum of 1,024 FVs and a certain amount of free space are available in one parity group.
Each parity group has the same configuration, and is assigned the same FVs of the same size and
RAID level.
The Virtual LVI functions of Delete LDEVs and Create LDEVs are performed on each parity group.
Parity groups are also separated from each other by boundary limitations. Therefore, you cannot
define a volume across two or more parity groups beyond these boundaries.
As the result of the Virtual LVI operations, a parity group contains FVs, CVs, and free spaces that
are delimited in logical cylinders. Sequential free spaces are combined into a single free space.
The following depicts an example of configuring volumes in a parity group:
Create LDEV function
Use the Create LDEV function to create a customized variable-sized volume. Use Virtual LVI to
create mainframe volumes.
The following depicts an example of creating customized volumes. First you delete FVs to create
free space. Then you can create one or more customized volumes of any size in that free space.
Create LDEV function 39