
DD Statements for Tape and Disk Datasets UNIT Parameter
Chapter 6. BIM-EPIC DD Statements 6-33
UNIT Parameter
Specifies a device or device type for processing. It is usually specified for output, and it is
required for disk output datasets. It is optional for input datasets that are controlled by the
DSN Catalog. If UNIT is not specified, UNIT=TAPE is assumed unless the dataset name
begins with “$$$.” (common work dataset) in which case UNIT=DISK is forced.
You can also request a unit by a group name. For disk datasets, BIM-EPIC chooses a volume
from the disk pool specified on the VOLUME parameter. For all tape datasets, BIM-EPIC
selects a suitable tape drive based on the mode setting associated with the group name/device-
type, if one exists, or associated to the default MODE setting.
For uncontrolled disk datasets, you can use a group name such as 'UNIT=DISK'. However,
you must also specify a particular device with the VOLUME parameter.
In MVS, you can specify a pool name in the UNIT parameter. With BIM-EPIC DD
statements, you must specify the VOL=SER parameter instead.
UNIT=
group-name
device-type
[,
cuu
]
Parameter Required? Valid Default
Specify one of the following (required):
group-name
DISK|SYSDA|TAPE|IDRC|CART TAPE
device-type
See text None
group-name specifies a generic request for a device group. This is the most generic kind of
request. In MVS it specifies a particular category of device set up by your installation. In
BIM-EPIC valid groups are:
• DISK or SYSDA specify any disk device
• TAPE specifies any tape device (does not override default MODE)
• IDRC specifies an IDRC drive
• CART specifies a 3480 non-IDRC drive
• TPA specifies a 3590 drive
device-type specifies a device type, such as FBA, 3390, 3480. Valid device types are
listed in the IBM System Control Statements manual. See the tape and disk device-classes for
the ASSGN statement. For tape devices, following are the associated mode settings (if not
overridden by the DCB DEN parameter):
•
2400 specifies any tape device (does not override default MODE)
• 3410 specifies any tape device (does not override default MODE)
Description
MVS Compatibility
Syntax
Parameters
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