HP XP7 Storage - Manual (Page 34)

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