IBM System storage DS6000 Series Redbook page 391

Figure 26-6 summarizes the scenario. The numbers indicate the sequence of events and
main considerations, and also relate to Figure 26-7 where the corresponding ICKDSF
commands are shown.
The sequence of steps for a Global Mirror planned outage is as follows:
1. Pause the Global Mirror session.
2. Suspend Global Copy pairs.
3. Application I/O continues all the time.
4. Failover from B to A. This turns the B volumes into Global Copy primary suspended.
5. Create a data consistent set of B volumes. This is done with a Fast Reverse Restore
(FRR) from the C to the B volumes.
6. Reestablish Global Mirror FlashCopy relationships from B to C. Both volumes are identical
afterwards.
7. Optionally create a data consistent set of D volumes.
8. Use the D volumes for test or other purposes.
9. In order to prepare and continue with Global Mirror, apply the changes that were
accumulated at the local site from the A volumes to the B volumes. This is done with a
Failback operation with the A volumes as primary and the B volumes as secondary.
10.Resume Global Mirror.
Figure 26-7 shows the corresponding ICKDSF commands for each step of the procedure.
(1) Pause session
PPRCOPY DDNAM E( DD01) TM ASYNC -
SESSNO( 001)
PAUSE
M ASTER
(2) Suspend all XD pairs
PPRCOPY DDNAM E( DD01) SUSPEND
LSS( X' 05' X' 00' )
PRI ( X' E500' 27310 X' 00' ) -
SEC( X' 7000' 22399 X' 00' )
(4) FAILOVER B->A
PPRCOPY UNI T ( 7000) ESTPAI R
FAI LOVER
PRI ( X' 7000' 22399 X' 00' ) -
SEC( X' E500' 27310 X' 00' ) -
LSS( X' 00' , X' 05' )
OPTI ON( XD)
(5) Fast Reverse restore, FRR
FC UNI T( 7100) ESTABLI SH
TARGETVOL( X' 00' , X' 00' , 7000) / * B VOLUM E
FASTREVERSERESTORE
M ODE
ONLI NTGT
TGTOKPRI M
TGTCANCOM EONLI NE ( NO)
Figure 26-7 ICKDSF command sequence for Global Mirror planned outage
Note that in most command examples ICKDSF refers to a corresponding JCL DD statement
through the DDNAME parameter. This DD statement points to the LSS or volume.
(6) FlashCopy B->C Start Change Recording
FC UNI T( 7000)
-
TARGETVOL
-
CHRCD
NOTGTW R
M ODE
ONLI NTGT
TGTCANCOM EONLI NE ( NO)
-
(7) Flashcopy B -> D
-
FC UNI T( 7000)
TARGETVOL
ONLI NTGT
TGTCANCOM EONLI NE ( NO)
-
(9) FAILBACK (A=Primary, B=Secondary)
-
PPRCOPY DDNAM E( DD01) ESTPAI R
FAI LBACK
- PRI
SEC
LSS
OPTI ON
/ * C VOLUM E
/ * REVERSE DI RECTI ON
( COPY) / * START BACKGROUNDCOPY
( YES)
( YES)
ESTABLI SH
( X' 01' , X' 00' , 7100)
( YES) / * CHANGE RECORDI NG
( YES) / * I NHI BI T TARGET W RI TES
( NOCOPY) / * NO BACKGROUND COPY
( YES)
ESTABLI SH / * B VOLUM E
( X' 01' , X' 10' , 7110) / * D VOLUM E
( YES)
/ * A VOLUM E
( X' E500' 27310 X' 00' ) / * A VOLUM E
( X' 7000' 22399 X' 00' ) / * B VOLUM E
( X' 05' , X' 00' )
( XD)
(10) Resume session
PPRCOPY DDNAM E( DD01) STASYNC
M ODI FY
* / -
SESSNO( 001)
* / -
CGI T( 0)
* / -
M XCT( 3)
* / -
M XDT( 030)
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Chapter 26. Global Mirror examples
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