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Interrupting remote copy mode and enabling the target path

Remote copy mode must be interrupted because the local storage system must remain ready for operation during the tests.

Actions on the local system

  1. Before remote copy mode is interrupted, the /MODIFY-REMOTE-COPY-PARAMETER command must be specified with ON-ERROR=*CONTINUE. Otherwise the source unit will reject all writes.

    /MODIFY-REMOTE-COPY-PARAMETER
  UNIT=<MN of source unit> / 
       *BY-VOLUME(VOLUME=<vsn>) / 
       *BY-PUBSET(PUBSET=<cat-id>) / 
       *BY-SYMMETRIX(SERIAL-NUMBER=
               <serialnumber of controller with source unit>
       ,LOGICAL-VOLUME=*ALL-SOURCES / <internal device number>)
  ,ON-ERROR=*CONTINUE

    It is important to specify the ON-ERROR=*CONTINUE operand.

  2. The source unit and target unit must be synchronized or be consistent. The processing mode must therefore be set to SYNCH or ASYNCH because pending writes could be noted in ADAPTIVE-COPY processing mode.

    /MODIFY-REMOTE-COPY-PARAMETER
  UNIT=<MN of source unit> / 
       *BY-VOLUME(VOLUME=<vsn>) / 
       *BY-PUBSET(PUBSET=<cat-id>) / 
       *BY-SYMMETRIX(SERIAL-NUMBER=
               <serialnumber of controller with source unit>
       ,LOGICAL-VOLUME=*ALL-SOURCES / <internal device number>)
  ,COPY-MODE=*SYNCH / *ASYNCH

    It is important to specify the COPY-MODE=*SYNCH operand for synchronous remote copy pairs or COPY-MODE=*ASYNCH for consistent remote copy pairs.

    A timestamp is stored in the storage system each time the remote copy status changes. This timestamp is output as the LAST-STA-CHNG field in the /SHOW- REMOTE-COPY command and displays the time (format DDDD.HH:MM:SS) which has passed since the last time the remote replication function was halted or resumed.

  3. Terminate applications, if necessary, to maintain data consistency on the source and target units.

  4. Check whether the source and target units are synchronized or are consistent.

    For COPY-MODE=*SYNCH:

    Global check: YES is shown in the SYNCH field

    /SHOW-REMOTE-COPY-STATUS UNIT=587C,INFORMATION=*SUMMARY

 %  --------------------------------------------------------------------------- 
 %  SRC   TAR   VOLUME!REMOTE-COPY  TARGET!LAST-STA-CHNG!LINK  !SYN!SRC!CON!CAS 
 %  UNIT  UNIT        !STATE   MODE ACCESS!DDDD.HH:MM:SS!      !CH !-RA!R-C!R-C 
 %  =========================================================================== 
 %   587C  5FA0 XXXX.0!ACTIVE  SYNC BY-SRC!  47.11:58:38!AVAIL.!YES! 10!NO ! - 

    /SHOW-SYMMETRIX-DEVICE-CONFIG
  UNIT=<MN der Source-Unit> / <MN of target unit> 
  ,CONFIGURATION=*REMOTE-COPY-PAIRS
  ,INFORMATION=*PHYSICAL

    Detailed check: The number of pending writes for the target unit must be 0 (see the grayed field in the example below).


    Example

    [Targets detached!]

    /SHOW-SYMMETRIX-DEVICE-CONFIG UNIT=(28AA),CONF=*REM-COPY-PAIRS,INF=*ALL

 %  -----------------------------------------------------------------------------
 %   UNIT   VOL   TYPE     CONTR-UNIT1 STA TIER- RAID  REM- TIME-      SIZE:
 %                         /SERIAL-NO      TYPE  /META COPY FINDER CURR./MAXIMUM 
 %  =============================================================================
 %   28AA XXXX.0 D3435    000190100207 RDY   -    5/-   S/- -/-/-   3984/ 3984 MB
 %   5FA0        D3435    000287400368 N-R   -    5/-   T/- -/-/-    -  / 3984 MB
 %  ---------------------------------------------------------------------------- 
 %  UNIT   VOL  !INTERNAL-DISK: PHYSICAL-INFORMATION
 %              !TYPE    PENDING DA-NO DISK STA !TYPE    PENDING DA-NO DISK STA
 %  ============================================================================ 
 %   28AA XXXX.0!REMOTE:    0 MB           READY
 %              !RAID5 :          16C  C7  READY!RAID5 :           2C  C7  READY 
 %              !RAID5 :           1D  C7  READY!RAID5 :          15D  C7  READY 
 %   5FA0       !REMOTE:    0 MB           READY
 %              !RAID5 :          16A  D8  READY!RAID5 :          16B  C8  READY 
 %              !RAID5 :           1C  C8  READY!RAID5 :           1D  D8  READY

    For COPY-MODE=*ASYNCH (SRDF/A):

    Global check: Y is shown in the TARGET-UNIT: CONS field

    /SHOW-REMOTE-COPY-STATUS UNIT=3AAB,INFORMATION=*ASYNCHRONOUS-SESSION

 %  ------------------------------------------------------------------------- 
 %  SRC    TARG  !SRDF/A-SESSION:                    !TARGET-UNIT:
 %  UNIT   UNIT  !ACT  NUM  CYCL# #DEV  T-PEND CYCL-T!PEND    LAG-T CONS PROT
 %  =========================================================================
 %   3AAB   38AB ! Y      0     6    29    0 MB 00:29!   0 MB 00:50   Y   DIS
 %  -------------------------------------------------------------------------

  5. Interrupt remote copy mode.

    /HOLD-REMOTE-COPY
  UNIT=<MN of source unit> / *BY-VOLUME(VOLUME=<vsn>) /
       *BY-PUBSET(PUBSET=<cat-id>) / *BY-SYMMETRIX(SERIAL-NUMBER=<ser-no>, 
       LOGICAL-VOLUME=*ALL-SOURCE-UNITS(RA-GROUP=<no>))

    The local system continues processing using only the source units.


    Example

    /SHOW-REMOTE-COPY-STATUS UNIT=587C,INFORMATION=*SUMMARY

 %  --------------------------------------------------------------------------- 
 %  SRC   TAR   VOLUME!REMOTE-COPY  TARGET!LAST-STA-CHNG!LINK  !SYN!SRC!CON!CAS 
 %  UNIT  UNIT        !STATE   MODE ACCESS!DDDD.HH:MM:SS!      !CH !-RA!R-C!R-C 
 %  =========================================================================== 
 %   587C  5FA0 XXXX.0!IN-HOLD SYNC BY-SRC!  47.11:58:38!AVAIL.!YES! 10!NO ! -

    The information output reflects the view on the remote copy pair and not on an individual unit. The /SHOW-SYMMETRIX-DEVICE-CONFIG command (see "SHOW-SYMMETRIX-DEVICE-CONFIG Displays the device configuration (Symmetrix/VMAX3)") supplies detailed information on a unit.

Actions on the standby system

  1. The remote links need not be deactivated as long as remote copy mode is interrupted. This can be done by the recovery procedures. Before you start the test, you should therefore ensure that no other unit is using these remote links.

    Enable the target path by setting the target units to READY.

    /SET-REMOTE-COPY-ACCESS
  UNIT=<MN of target unit> / *BY-VOLUME(VOLUME=<vsn>) /
       *BY-PUBSET(PUBSET=<cat-id>) / 
       *BY-SYMMETRIX(SERIAL-NUMBER=<target serialnumber>
      ,LOGICAL-VOLUME=*ALL-TARGET-UNITS(RA-GROUP=<no>))
       ,TARGET-ACCESS=*DIRECT

    The standby system can access the target units once this command has been executed. The recovery procedures can now be tested. The local system continues to access the source units because the /SET-REMOTE-COPY-ACCESS command does not affect on the source units if /HOLD-REMOTE-COPY was issued beforehand.

    The *BY-VOLUME operand may only be used if the target unit was READ-ONLY and is unique, or if the source unit was accessible, i.e. VSN was readable on the unit.

    The *BY-PUBSET operand can be only used if the source unit was accessible and the pubset is imported on this server.

  2. If the source unit and target unit were not fully synchronized before /HOLD-REMOTE-COPY was issued, and if PENDING-UPDATES are not allowed, transition of the target unit to READY is rejected. This prevents the use of invalid data. This can be overridden by the following command.

    /SET-REMOTE-COPY-ACCESS
  UNIT=<MN of target unit> / *BY-VOLUME(VOLUME=<vsn>) /
       *BY-PUBSET(PUBSET=<cat-id>) /
       *BY-SYMMETRIX(SERIAL-NUMBER=<target serialnumber>
  ,LOGICAL-VOLUME=*ALL-TARGET-UNITS(RA-GROUP=<no>))
  ,TARGET-ACCESS=*DIRECT(ALLOW-PEND-UPDATES=*YES)


    Example

    /SHOW-REMOTE-COPY-STATUS UNIT=587C,INFORMATION=*SUMMARY

 %  ---------------------------------------------------------------------------
 %  SRC   TAR   VOLUME!REMOTE-COPY  TARGET!LAST-STA-CHNG!LINK  !SYN!SRC!CON!CAS
 %  UNIT  UNIT        !STATE   MODE ACCESS!DDDD.HH:MM:SS!      !CH !-RA!R-C!R-C
 %  ===========================================================================
 %   587C  5FA0 XXXX.0!IN-HOLD SYNC DIRECT!  47.11:58:38!AVAIL.!NO ! 10!NO ! -
 %  --------------------------------------------------------------------------

    The information output reflects the view on the remote copy pair and not on an individual unit. The /SHOW-SYMMETRIX-DEVICE-CONFIG command (see "SHOW-SYMMETRIX-DEVICE-CONFIG Displays the device configuration (Symmetrix/VMAX3)") supplies detailed information on a unit.

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