HP XP P9500 Storage - Manual (Page 47)

Capacity of a slot
Capacity (KB) of a slot Emulation type
48 Other than OPEN-V
256 OPEN-V
Calculated management area capacities (SATA-E drive)
Calculated management area capacities are expressed in slots.
A SATA drive requires OPEN-V for open systems.
SATA-E (slots) Emulation type
RAID 6 (6D+2P) RAID 5 (7D+1P) RAID 5 (3D+1P) RAID 1 (2D+2D)
2,211,840 3,010,560 552,960 122,880 OPEN-V
Configuring volumes in a parity group
For RAID 5 (7D+1P) or RAID 6 (6D+2P) levels, 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 VLL 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 VLL 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 LUN to
create an open-systems volume.
You can also use the Create LDEV function to create a volume to be used as a system disk on either
a mainframe or an open system. A system disk is not available to hosts, command devices, pool
volumes, journal volumes, and so on. For more information, see
“Using a system disk” (page 57) .
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 47