The system reads the VATLSTxx members that were specified in the VAL parameter in IEASYSxx. If the system detects an incorrect VATLSTxx entry, the system issues informational message IEA855I, and continues processing the remaining entries.
If an I/O error does not occur during the reading, the system lists the IPL and SYSTEM use attributes in message IEA168I.
Volume attribute processing compiles a list of all VATLSTxx entries. If a particular volume serial number appears on more than one entry, the system uses the volume attributes specified in the last entry for that volume serial.
Mount messages can be issued for unmounted volumes, up to the maximum number of processed entries. The system can process up to 64000 unique VATLSTxx entries at IPL.
The operator can respond to the mount messages by replying with the device number of the requested device type (that is, 3330-1). If the operator chooses not to mount a volume, the operator replies ‘U’ or ENTER.
If the operator enters an incorrect device number, or a path to a device is not available, the operator can reenter new device numbers.
To indicate that no more volumes will be mounted, enter ‘U’ or ENTER.
When message IEA860A lists the devices that need volumes, the operator should mount the required volumes on the replied devices. When all devices have become ready (green lights on), the operator replies ‘U’ or ENTER to message IEA860A. Volume attribute processing then scans for mounted volumes.
If a volume that did not appear in the mount message is mounted on a unit specified by the operator, it is unloaded. The volume is also unloaded if the operator mounts the requested volume on a device type other than the one specified in the volume attribute list, or on an un-requested unit.
If all the required devices do not become ready, volume attribute processing issues message IEA893A, which lists the devices that are not ready. If the operator intends to ready these devices, the operator may do so before replying ‘U’ or ENTER to the message. If a volume cannot be mounted on a device for some reason (such as a hardware problem), the operator should reply NO to the message, after all other required devices have been processed. This response indicates to volume attribute processing that no more volumes will be mounted.
If the system does not find a volume that matches a generic volume serial number entry, it issues message IEA166I.