z/VM: CP Commands and Utilities Reference - z/VM - IBM

SET VDISK
►►
Set
Authorization
Purpose
Operands
VDISK
VDSK
Syslim
Userlim
Privilege Class: B
Default
Infinite
nnnnnnnnnn
nnnnnnnM
nnnnG
Blocks
Blks
Use SET VDISK to control the maximum amount of system storage that is available
for allocation as virtual disks in storage. Using virtual disks in storage increases the
load on system paging, so you should set limits in proportion to the availability of
paging space.
Syslim
sets the total resource available for allocating virtual disks in storage on the
system.
Userlim
sets the maximum resource available for virtual disks in storage created by a
single user using the DEFINE command. This limit does not apply to virtual
disks in storage defined by MDISK statements in the directory.
Default
sets the limit to the default value. If an installation default is defined in the
system configuration file, that value is used. If an installation default is not
defined in the system configuration file, or if the file is not found, the built-in
default is used, as follows:
v The built-in default user limit is 0.
v The built-in default system limit is the minimum of:
SET VDISK
– The amount of virtual storage that can be represented by one-quarter of
the usable dynamic paging area (DPA) below 2 gigabytes (based on the
fact that each gigabyte of virtual disk defined requires 2050 pages of real
storage below 2 gigabytes)
– The amount of storage represented by one-quarter of the paging space
defined for CP use.
Infinite
indicates that there is no limit. All available system storage may be allocated to
virtual disks in storage.
nnnnnnnnnn Blocks
nnnnnnnnnn Blks
specifies the number of 512-byte blocks of storage available for virtual disks in
storage. If the number specified is equal to or greater than 2147483648, the
limit is set to INFINITE.
►◄
Chapter 2. CP Commands 1415