Example 1: The following example shows how to achieve a preference order of device selection when devices are on three channel paths and volume mounting is required. As a result of these control cards, requests for DACH1 would attempt allocation on channel path 1, then on channel path 2, and finally on channel path 3. Similarly, requests for DACH2 would attempt allocation first on channel path 2, then on channel path 3, and then on channel path 1. By using DISK1, DISK2, or DISK3, strict channel path separation could be achieved.

DEVICE,XTYPE=(3330CH1,DA),XUNIT=(130,SY2,S1,ON)
DEVICE,XTYPE=(3330CH2,DA),XUNIT=(230,SY2,S1,ON)
DEVICE,XTYPE=(3330CH3,DA),XUNIT=(330,SY2,S1,ON)

SETNAME,XTYPE=3330CH1,NAMES=(DACH1,DISK1,3330)
SETNAME,XTYPE=3330CH2,NAMES=(DACH1,DACH2,DISK2,3330)
SETNAME,XTYPE=3330CH3,NAMES=(DACH1,DACH2,DACH3,DISK3,3330)
SETNAME,XTYPE=3330CH1,NAMES=(DACH2,DACH3)
SETNAME,XTYPE=3330CH2,NAMES=(DACH3)

Example 2: The following example illustrates how to dedicate two 3330 disks and three tapes on channel path 1. There is a two-channel main processor with four tape devices and four disk devices on each channel path. The accessibility desired by name is:

TAPE

Any tape

TAPEC1

Any tape on channel path 1

TAPEC2

Any tape on channel path 2

DISK

Any disk

DISKC1

Any disk on channel path 1

DISKC2

Any disk on channel path 2

3330

Any 3330 disk

3340

Any 3340 disk

The XTYPE names are chosen to indicate the model of a device and its channel path location. These must be specific enough to allow the separation of devices to satisfy the access level desired.

SETNAME,XTYPE=3340C1,NAMES=(DISK,DISKC1,3340)
SETNAME,XTYPE=3340C2,NAMES=(DISK,DISKC2,3340)
SETNAME,XTYPE=3330C1,NAMES=(DISK,DISKC1,3330),
POOLNAMS=NETDISK
SETNAME,XTYPE=3330C2,NAMES=(DISK,DISKC2,3330),
POOLNAMS=NETDISK
SETNAME,XTYPE=3400C1,NAMES=(TAPE,TAPEC1,3400-4),
POOLNAMS=NETTAPE
SETNAME,XTYPE=3400C2,NAMES=(TAPE,TAPEC2,3400-4)