DS5LABEL Back to Index page
 
Prolog 
Control Block Contents 
   DS5LABEL DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

 
  DS5LABEL Control Block Content Top of page
 

 DS5LABEL DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DS5LABEL Mapping for VTOC DSCB's 0000 0 Bitstring 4 DS5KEYID Key identifier 0004 4 Bitstring 5 DS5AVEXT Available extent Bytes 1-2 Rel track addr of the first track in the extent Bytes 3-4 Number of unused cyls in the extent Byte 5 Number of additional unused tracks 0009 9 Bitstring 35 DS5EXTAV Seven available extents 002C 44 Character 1 DS5FMTID Format identifier For Format 5 DSCB, DS5FMTID = c'5'. 002D 45 Bitstring 90 DS5MAVET Eighteen available extents 0087 135 Bitstring 5 DS5PTRDS Pointer to next Format 5 DSCB 0000008C DS5END *
 
 
  DS5LABEL Storage Layout Top of page
 
          
*** DS5LABEL - Mapping for VTOC DSCB's
*
*     +---------------------------+---------------------------+
*   0 |         DS5KEYID          |        DS5AVEXT-          |
*     +------+--------------------+---------------------------+
*   8 |-(004)|                                                |
*     +------+                                                |
*  10 |                                                       |
*     =                       DS5EXTAV                        =
*     |                           +------+--------------------+
*  28 |                           |:FMTID|                    |
*     +---------------------------+------+                    |
*  30 |                                                       |
*     =                       DS5MAVET                        =
*     |                                                +------+
*     |                                                |(087)-|
*     +---------------------------+--------------------+------+
*  88 |        -DS5PTRDS          | 8C
*     +---------------------------+
*
*** DS5LABEL - Mapping for VTOC DSCB's
 
 
  DS5LABEL Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
DS5AVEXT       0004
DS5END         0087 0000008C
DS5EXTAV       0009
DS5FMTID       002C
DS5KEYID       0000
DS5MAVET       002D
DS5PTRDS       0087
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:49:56 EDT.
Copyright IBM Corporation, 1990, 2022