XDSBK | Back to Index page

| Prolog Control Block Contents XDSBK 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.

XDSBK Prolog | Top of page

     NAME       : HCPXDSBK
     DESCRIPTION: XDISK services system information
     DSECT      : XDSBK
     FUNCTION   : System wide information for XDISK services
     LOCATED BY : SYSXDISK
     CREATED BY : HCPXDLEN
     DELETED BY : None
     REFERENCES : None
     SERIALIZED : The socket id field (XDSOCKET) is created/filled in during
                  CP initialization and requires no serialization.  All other
                  fields are updated using Compare and Swap.
     COMPATIBILITY AND MIGRATION CONCERNS : None
     RELOCATION CONSIDERATIONS : None

XDSBK Control Block Content | Top of page

     XDSBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      XDSBK          XDISK services system information
    0000    0 Signed       4 XDSOCKET       Socket ID for XDISK services
    0004    4 Signed       4 XDSLKTOT       Count of times LINK command has
                                            been issued on this system
    0008    8 Signed       4 XDSLKPLX       Count of times SSI was consulted
                                            for LINK command
    0010   16 Dbl-Word     8 XDSLKTOD       Cumulative time for LINK command
                                            to consult with SSI
    0018   24 Signed       4 XDSDTTOT       Count of times DETACH command
                                            issued on this system
    001C   28 Signed       4 XDSDTPLX       Count of times SSI was consulted
                                            for DETACH command
    0020   32 Dbl-Word     8 XDSDTTOD       Cumulative time for DETACH
                                            command to consult with SSI
    0028   40 Signed       4 XDSWKTOT       Count of times WRKALLEG used (SET
                                            WRKALLEG, DASDOPT WRKALLEG or
                                            MINIOPT WRKALLEG)on this system.
    002C   44 Signed       4 XDSWKPLX       Count of times SSI consulted for
                                            WRKALLEG
    0030   48 Dbl-Word     8 XDSWKTOD       Cumulative time for WRKALLEG to
                                            consult with SSI
    0038   56 Signed       4 XDSQLTOT       Count of times QUERY LINKS issued
                                            on this system
    003C   60 Signed       4 XDSQLPLX       Count of times SSI consulted for
                                            QUERY LINKS
    0040   64 Dbl-Word     8 XDSQLTOD       Cumulative time for QUERY LINK to
                                            consult with SSI
    0048   72 Signed       4 XDSLKRSP       Number of LINK responses for
                                            other SSI members
    004C   76 Signed       4 XDSDTRSP       Number of DETACH responses for
                                            other SSI members
    0050   80 Signed       4 XDSWKRSP       Number of WRKALLEG responses for
                                            other SSI members
    0054   84 Signed       4 XDSQLRSP       Number of Q LINKS responses for
                                            other SSI members
    0058   88 Signed       4 XDSMDCHG       Number of MDC changes made on
                                            this system based on other SSI
                                            members requests.
    005C   92 Bitstring    1 XDSFLAG        Flag byte
              1... ....      XDSSPLDN       X'80' XDSSPLDN SPOL volume
                                            checking already done
              .1.. ....      XDSZIADN       X'40' XDSZIADN CP disks have been
                                            reaccessed
              ..1. ....      XDSXLKNR       X'20' XDSXLKNR Don't reply to XLK
                                            requests
    005D   93 Bitstring    1 XDSOCKER       XDSOCKET error code
    005E   94 Bitstring    1 * (2)          Reserved for future IBM use
    0060   96 Dbl-Word     8 XDSTOKEN       XDISK Service Token
    0068  104 Signed       2 XDSHGBST       Highest priority boost ever seen
                                            across this interval.
    006A  106 Bitstring    1 * (6)          Reserved for future IBM use
              0000000E       XDSSIZE        (*-XDSBK+7)/8 size in double
                                            words

XDSBK Storage Layout | Top of page

    *** XDSBK - XDISK services system information
    *
    *     +---------------------------+---------------------------+
    *   0 |         XDSOCKET          |         XDSLKTOT          |
    *     +---------------------------+---------------------------+
    *   8 |         XDSLKPLX          |///////////////////////////|
    *     +---------------------------+---------------------------+
    *  10 |                       XDSLKTOD                        |
    *     +---------------------------+---------------------------+
    *  18 |         XDSDTTOT          |         XDSDTPLX          |
    *     +---------------------------+---------------------------+
    *  20 |                       XDSDTTOD                        |
    *     +---------------------------+---------------------------+
    *  28 |         XDSWKTOT          |         XDSWKPLX          |
    *     +---------------------------+---------------------------+
    *  30 |                       XDSWKTOD                        |
    *     +---------------------------+---------------------------+
    *  38 |         XDSQLTOT          |         XDSQLPLX          |
    *     +---------------------------+---------------------------+
    *  40 |                       XDSQLTOD                        |
    *     +---------------------------+---------------------------+
    *  48 |         XDSLKRSP          |         XDSDTRSP          |
    *     +---------------------------+---------------------------+
    *  50 |         XDSWKRSP          |         XDSQLRSP          |
    *     +---------------------------+------+------+-------------+
    *  58 |         XDSMDCHG          |:FLAG |:OCKER|/////////////|
    *     +---------------------------+------+------+-------------+
    *  60 |                       XDSTOKEN                        |
    *     +-------------+-----------------------------------------+
    *  68 |  XDSHGBST   |/////////////////////////////////////////|
    *     +-------------+-----------------------------------------+
    *  70
    *
    *** XDSBK - XDISK services system information

XDSBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    XDSDTPLX       001C
    XDSDTRSP       004C
    XDSDTTOD       0020
    XDSDTTOT       0018
    XDSFLAG        005C
    XDSHGBST       0068
    XDSLKPLX       0008
    XDSLKRSP       0048
    XDSLKTOD       0010
    XDSLKTOT       0004
    XDSMDCHG       0058
    XDSOCKER       005D
    XDSOCKET       0000
    XDSQLPLX       003C
    XDSQLRSP       0054
    XDSQLTOD       0040
    XDSQLTOT       0038
    XDSSIZE        006A 0000000E
    XDSSPLDN       005C 80
    XDSTOKEN       0060
    XDSWKPLX       002C
    XDSWKRSP       0050
    XDSWKTOD       0030
    XDSWKTOT       0028
    XDSXLKNR       005C 20
    XDSZIADN       005C 40

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:31:49 EDT.
Copyright IBM Corporation, 1990, 2020