Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

2-48 About TrueCopy for z/OS Operations
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Configure TCzA consistency groups. Since each TCzA pair must belong
to one group, the TCz software* must be used to add and configure the
groups (timer type, copy pending timeout, RCU ready timeout) before you
can add any TCzA pairs. Once the async options, groups, and group options
are configured, the PPRC commands can be used to control/monitor TCzA
pairs.
Change the initial copy priority, CFW data option, or DFW to R-VOL
option. If CESTPAIR is used to establish a TCz pair, the following options
will be used: initial copy priority = 0, CFW data = copy to R-VOL**, and
DFW to R-VOL = not required. The TCz software* must be used to change
these options.
Note: The DFW to R-VOL setting does not affect the I/O performance of
the M-VOLs. If one side of cache is closed due to an RCU failure, the TCz
copy operation still uses DFW. The only difference between not required
and required is that new pairs cannot be established with the DFW-to-R-
VOL required option when one side of RCU cache is closed (the add pair
operation fails).
Note: When you create a TCz pair, and if you select only M-VOL for the
CFW data option, the data set which is updated by CFW in M-VOL cannot
be used in R-VOL. To use this data set in R-VOL, release a TCz pair, and
format the data set.
*Note: If the USP V Storage Navigator software is not installed, please contact
your Hitachi account team for further information on TCz configuration
services.
**Note: By using Remote Copy Function Switch, you can set the following
option with PPRC command: CFW data = only M-VOL. If you want to use this
function, please contact your Hitachi account team.
P/DAS Support
TrueCopy for z/OS Sync supports the IBM P/DAS host software function.
P/DAS allows you to relocate or migrate data by redirecting all application I/Os
from the M-VOL of a TCz pair to the R-VOL without interrupting access to the
data. Please refer to the following IBM publications for important information
on the requirements and procedures for P/DAS operations:
Planning for IBM
Remote Copy (SG24-2595), Advanced Copy Services (SC35-0355), DFSMS
MVS V1 Remote Copy Guide and Reference (SC35-0169). Note: TCzA does
not support P/DAS SWAP.
Restrictions:
P/DAS does not support CFW operations. You must stop CFW applications
before performing P/DAS operations on TCz volumes.
P/DAS through channel extenders is not supported.