HP StorageWorks XP Remote Web Console Software - Manual (Page 56)

56 Volume Management for the XP1024/XP128
For emulation types other than OPEN-V, one parity group consists of a maximum of 16 VDEVs. For
RAID-5 (7D + 1P) level or RAID-6 (6D + 2P) levels, a maximum of 512 fixed-size volumes (FVs), and a
certain amount of free space are available in one VDEV. For other RAID levels, a maximum of 256 FVs
and a certain amount of space are available. Each VDEV in a parity group has the same configuration,
and is assigned the same FVs of the same size and RAID level.
CVS functions (Volume to Space, Install CV, Volume Initialize, and Make Volume) are performed on each
VDEV. VDEVs are also separated from each other by the boundary limitation. You cannot define a volume
across two or more VDEVs beyond the boundaries.
Figure 29 Parity group configuration for other than OPEN-V
As the result of CVS operations, a VDEV contains fixed volumes, custom volumes, and free spaces that are
delimited in logical cylinders. Sequential free spaces are combined into a single free space.
Figure 30 Virtual CVS volume configuration for other than OPEN-V
Before changing ordinary target ports or RCU target ports to initiator ports, make sure that no I/Os (such
as Extended Copy commands) are being performed from the host server to the affected ports. You can
change the port type of free ports only.