4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 09018: Indexed VTOC Potentially in Error

09018: Indexed VTOC Potentially in Error

    FILE:             VOA Volume Allocation File
    SAS FILE NAME:    DETAIL.VCAVOA01
    SOURCE LOCATION:  prefix.MICS.USER.SOURCE(DYVCAEXC)

    SEVERITY:         Critical      (SEVERITY='C')
    MANAGEMENT AREA:  Reliability   (MGMTAREA='RELIABILITY')

    PURPOSE:  Identifies that a VTOC is using an Indexed VTOC
but the DOS bit is not set.

    RATIONALE:  Use of an Indexed VTOC is indicated in the
VTOC's Format 4 DSCB.  Because an Indexed VTOC changes the
format of a standard VTOC, the DOS convert bit is also set to
indicate that the normal free space computations usually
found in the Format 5 DSCBs are no longer correct.  If
Indexed VTOC support is not available on all systems in a
multiple-system complex, a system that does not have the
support may attempt to convert a VTOC because the DOS bit was
set by another system that has converted the VTOC to use
Indexed VTOC support.  This can result in the VTOC being
incorrectly updated.

    DEFINITION:  This exception is detected when an Indexed
VTOC data set is being used but the DOS bit has not been set.

    EXCEPTION STATEMENTS:  The SAS statements identifying the
exception situation and describing the condition are stored
in the source member named in SOURCE LOCATION and are
described below:

/*---------------------------------------------------------*/
/*                                                         */
/*  09018                                                  */
/*  INDEXED VTOC POTENTIALLY IN ERROR                      */
/*                                                         */
/*---------------------------------------------------------*/
IF VOAVTOCI = '0......1'B THEN DO;
  EXCCODE='09018'; SEVERITY='C'; MGMTAREA='RELIABILITY';
  EXCDESC1='INDEXED VTOC POTENTIALLY IN ERROR.';
  EXCDESC2='INDEX VTOC INDICATOR SET BUT DOS BIT NOT SET.' ||
           ', VOL=' || VOLSER;
  LINK HIT;
END;

    THRESHOLD MODIFICATION:  No threshold modification is
required.