gtpm1m3iTPF V4R1 Migration Guide: 3.1 to 4.1

Operational Changes to IPLB

The following section discusses the operational changes to IPLB for the TPF 4.1 system.

Duplicate Volume Serial Numbers (VSNs)

Prior to this release, DASD modules with duplicate volume serial numbers caused various problems during IPL disk roll call. If the duplicates were BSS online modules, the IPL was ended. If the duplicates were on an multiple database function (MDBF) subsystem, the subsystem was ended. In the case of general files, the first device was mounted and subsequent duplicates were discarded.

IPLB was changed to present the operator with a list of duplicate volumes and allow the operator to choose the address of the device to be used for the current IPL.

Three new unsolicited messages are used for this function:

The first message lists the addresses of the duplicate VSNs. The second prompts the operator for the address of the device to be used or NONE if none of the duplicates are to be used, and the third verifies that the request was accepted.

See Messages (System Error and Offline) and Messages (Online) for more information about these messages.