Configuring Custom-Sized Provisioning; Virtual Lvi Functions; Virtual Lvi Requirements; Virtual Lvi Specifications - HP XP7 User Manual

3 Configuring custom-sized provisioning

Configuring custom-sized provisioning involves creating and configuring a customized volume
(CV). A CV is a fixed-sized volume that is divided into arbitrary sizes.

Virtual LVI functions

Virtual LVI function is used to create, configure, or delete a customized volume (LDEV).
The Virtual LVI function is a mainframe function available in Virtual LVI software.
A parity group usually consists of some fixed-sized volumes (FVs) and some free space. The number
of FVs is determined by the emulation type. A Virtual LVI volume usually consists of at least one
FV, one or more customized volumes (CVs), and some free space.
Use the Virtual LVI function to configure variable-sized volumes that efficiently exploit the capacity
of a disk. Variable-sized volumes are logical volumes that are divided into smaller than normal
fixed-size volumes. This configuration is desirable when frequently accessed files are distributed
across smaller multiple logical volumes. This generally improves the data accessing performance,
though file access may be delayed in some instances.
The Virtual LVI function can also divide a logical volume into multiple smaller volumes to reduce
unused capacity and provide a more efficient use of space for small volumes such as command
devices. The Virtual LVI function can efficiently exploit the capacity of a disk by not wasting capacity
using larger volumes when the extra capacity is not needed.

Virtual LVI requirements

Use of Virtual LVI on the HP XP7 Storage to configure variable-sized volumes requires the following:
A license key for Virtual LVI.
For details about the license key or product installation, see the HP XP7 Remote Web Console User
Guide.

Virtual LVI specifications

"Virtual LVI specifications for mainframe systems" (page 34)
"CV capacity by emulation type for mainframe systems" (page 35)

Virtual LVI specifications for mainframe systems

Parameter
Track format
Emulation type
Ability to intermix emulation type
Maximum number of volumes (normal and
Virtual LVI) per parity group
Maximum number of volumes (normal and
Virtual LVI per storage system
Minimum size for one Virtual LVI volume
Maximum size for one Virtual LVI volume
Size increment
34 Configuring custom-sized provisioning
Mainframe system
3390
3390-3, 3390-3A, 3390-3B, 3390-3C, 3390-9, 3390-9A, 3390-9B,
3390-9C, 3390-L, 3390-LA, 3390-LB, 3390-LC, 3390-M, 3390-MA,
3390-MB, 3390-MC, 3390-A, 3390-V
If track sizes of the volumes are the same, emulation types can be intermixed.
2,048 for RAID 5 (7D+1P), RAID 6 (6D+2P) or RAID 6 (14D+2P).
1,024 for other RAID levels.
65,280
1 user cylinder
See"CV capacity by emulation type for mainframe systems" (page 35)
1 cylinder (cyl) which is equal to 870 KB.