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

DEFINE (Temporary Disk)
DEFINE (Temporary Disk)
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Notes:
DEFine
Authorization
Purpose
Operands
Usage Notes
(1)
T2314
T2319
T3310
T3380
T3390
T9336
TFB-512
AS
AS
vdev
Privilege Class: G
vdev
CYL
nblk
ncyl
1 2314, 2319, and 3310 are only allowed for compatibility reasons.
190 z/VM: CP Commands and Utilities Reference
BLK
Use DEFINE (temporary disk) to increase virtual workspace by attaching temporary
disks to your virtual machine.
T2314, T2319, or T3310
All above DASD are accepted for compatibility but result in a message
indicating that the temporary disk is not defined because space is not available.
T3380, T3390, T9336, or TFB-512
All above DASD add a temporary virtual disk to your virtual machine
configuration. The 4 digits following the T correspond to the virtual device type.
TFB-512 indicates that any supported FBA device is acceptable.
AS vdev
vdev
is the virtual device number of the temporary disk you are defining.
CYL ncyl
ncyl
is the size of this temporary disk in cylinders (valid only for CKD and ECKD
disks).
BLK nblk
nblk
is the size of this temporary disk in blocks (valid only for FBA disks).
1. Temporary disk space is assigned from a pool of DASD resources; therefore,
you should always format your temporary disk space before you use it.
2. The temporary disk may be slightly larger than the size requested because of
CP’s implementation of system temporary disk space management.
3. Using ICKDSF is the preferred method for formatting a DASD device if it is to
be used by CP (such as an IPL device). The CMS FORMAT command should
be used to format a DASD device if it is to be used as a CMS disk.
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