HP XP P9500 Storage - Manual (Page 3)

Contents
1 Continuous Access Synchronous Z overview...................................................7
How Continuous Access Synchronous Z works .............................................................................7
Typical components .................................................................................................................8
Disk arrays..............................................................................................................................8
Main (MCU), remote (RCU) disk arrays...................................................................................9
Volume pairs ...........................................................................................................................9
Data path .............................................................................................................................10
Consistency groups ................................................................................................................10
Interfaces ..............................................................................................................................10
Failover software ...................................................................................................................10
Error reporting communications ...............................................................................................11
Overview of initial, update copy operations ..............................................................................11
Initial copy .......................................................................................................................11
Update copy ....................................................................................................................11
2 Requirements and specifications.................................................................13
System requirements ...............................................................................................................13
BCM specifications ................................................................................................................14
Command device ..............................................................................................................17
F/M = FB message output control option when operating R-VOLs.............................................17
PPRC specifications, restrictions ................................................................................................17
Continuous Access Synchronous Z operations performed with PPRC .........................................18
Continuous Access Synchronous Z options not supported with PPRC .........................................18
PPRC, BCM command comparison.......................................................................................19
P/DAS support, restrictions .....................................................................................................20
Restrictions........................................................................................................................20
GDPS support .......................................................................................................................20
RMF PPRC Link-path statistical information support.......................................................................21
TPC-R cooperation support.......................................................................................................23
Cache failure....................................................................................................................24
Unregistered error code for TPC-R........................................................................................24
3 Planning for Continuous Access Synchronous Z.............................................25
Preparing P9500 disk arrays....................................................................................................25
Ensuring adequate cache....................................................................................................25
Installing or removing cache memory/shared memory............................................................25
Using DASD fast write........................................................................................................25
Using an earlier model storage system..................................................................................26
Enabling R-VOL Read, other system options...........................................................................26
Planning for system performance..............................................................................................27
Planning volume pairs.............................................................................................................29
Volume pair requirements and recommendations....................................................................29
Handling duplicate VOLSERs ..............................................................................................30
Planning I/O to the R-VOL...................................................................................................31
Managing differential data.................................................................................................31
Maximum number of pairs supported...................................................................................31
Calculating maximum number of pairs.............................................................................31
Priority set for initial copy operations and scheduling order.....................................................33
Planning data paths................................................................................................................34
Amount of bandwidth required............................................................................................34
Fibre Channel requirements.................................................................................................34
Supported data path configurations.....................................................................................35
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