READLDL = YES | NO

• When READLBL=YES (default)
  • The volume label of the mounted volume is read before calling the pre-label exit. The information gathered from the read volume label is subsequently passed to the pre-label and post-label exits.
• When READLBL=NO
  • The volume label of the mounted volume is not read. INXLBNRD (label-not-read) in INXFLAG2 is set.
  • No volume label information related to the mounted volume is passed to the pre or post-label exits.
  • The requested volume serial is used in LACS verify and authorization checking.
  • In particular,
    • No flags related to the mounted volume label are set nor should they be interrogated. These flags include: INXVRDOK, INXHRDOK, INXVLSNS, INXNOLBL, INXVRDTM, INXBLANK, INXIOERR, INXSTDAL, INXVH1OK.
    • The values of VOL1, INXRDVOL,and HDR1, are not read from the mounted volume. Therefore, INXVOL1, INXRDVOL, and INXHDR1 are zero.
    • For pre-label exit, INXSNSOK and INXSENSE refer to the result of I/O issued to read the mounted volume label.

      If READLBL=NO was specified, INXSNSOK and INXSENSE is never set and is not interrogated.

      If READLBL=YES was specified or is defaulted, INXSNSOK and INXSENSE may contain valid values if an I/O error occurred on the I/O.

    • For the post-label exit, INXSNSOK and INXSENSE refer to the result of I/O issued to write the volume label, hence they are independent of READLBL values and may be non-zero when passed to the post-label exits if an I/O error occurred.