Operator-requested DDR

Use the following form of the SWAP command when it is necessary to move a volume to another device, for example, when the device requires maintenance.

 
G [/]devnum1,[/]devnum2

[/]devnum1: The device number of the device from which the volume is to be swapped.
[/]devnum2: The device number of the device to which the volume is to be swapped.

devnum1 and devnum2 must be of the same device type and have compatible features. A device number is 3 to 4 hexadecimal digits, optionally preceded by a slash (/).

To perform a dynamic device reconfiguration, enter a SWAP command. Then:

Wait for system message IGF500D or IGF509D and reply with one of the following:
YES

The system is to proceed as indicated.

NO

The swap request is to be canceled.

devnum2

An alternate “to” device is to be used.
After replying YES or devnum2, wait for the following message before proceeding with the swap:
```
* id IGF502E PROCEED WITH SWAP OF devnum1 TO devnum2
```

Note:

When the alternate “to” (devnum2) device is offline, the system takes the ‘from’ device offline:
```
IEF880I devnum1 NOW OFFLINE BY DDR 
```
The system never requests DDR for readers, printers, or punches, but you can request a swap of these devices. Unit record devices must be in a not-ready state when you enter the SWAP command. Devices with mounts pending cannot be swapped.
If you are using a 3348 Model 70F Data Module, make sure that the “to” 3340 device has the fixed-head feature installed.
A device with a 3-digit device number can be swapped to a device with a 4-digit device number, but not the reverse.

Example 1:

To move a volume from a device with device number 183 to a device with device number 283, enter:

swap 183,283

Example 2:

To move a volume from a device with device number 183 to a device with device number 3330, enter:

swap 183,/3330