Disable Logical Block Positioning on a Tape Device - QUSRSYS/deviceName - where deviceName is the device being disabled

Resolving The Problem

This document explains how to disable logical block ID positioning if message CPD4076 occurs during restore of data from Virtual tape library.


CPD4076    Diagnostic              20   24/09/12  20:04:53.895482  QTAERR       QSYS        00EA     QSRRSOPN    QSYS        0011
Message . . . . :   Logical block identifier not correct.                    
Cause . . . . . :   The user exit program &5 in library &6 specified &10 for logical block identifier for tape processing exit type &7 and library device exit type &11 at character position &8 within the control value structure.  The condition code of 1 indicates why the logical block identifier is not correct.

This message can occur if VTL is providing incorrect logical block ID information or not correctly processing the set position request.

It is possible to circumvent this problem disabling logical block ID positioning:

Example: Disabling positioning by logical block ID:

CRTDTAARA DTAARA(QUSRSYS/TAPMLBXX) TYPE(*CHAR) LEN(128)
CHGDTAARA DTAARA(QUSRSYS/TAPMLBXX (21 1)) VALUE('N')

NOTE: Use the QTEMP library instead of QUSRSYS if you want the change to apply only to the current job. A data area must be created for every MLB name used by the VTL.