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

Performing TrueCopy for z/OS Configuration Operations 5-31
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Setting the Asynchronous Copy Options
The Async Option dialog box (see Figure 5-7) allows you to set and modify the
TrueCopy for z/OS Async copy option parameters for the connected storage
system. To open the Async Option dialog box, right-click the CT groups and
click the Async Option command.
The async options apply to the entire physical control unit, including all
TrueCopy for z/OS M-VOLs and R-VOLs behind the control unit. The async
options can only be modified when no TrueCopy Async pairs or groups exist in
the connected CU (M-VOLs or R-VOLs).
Figure 5-7 Async Option Dialog Box
The CLPR(#) drop-down list allows you to specify CLPR ID. The default
setting is 00.
The Pending Update Data Rate (%) option allows you to specify the
TrueCopy for z/OS Async (and TrueCopy Async) sidefile threshold, which is the
maximum amount of cache that can be used for storing TrueCopy for z/OS
(and TrueCopy) Async recordsets (sidefiles). You can select any value between
30% and 70% (10% increments). For further information on sidefile inflow
control.
Note: The current pending update data rate is common to both TrueCopy for
z/OS and TrueCopy operations. The most recently entered value (on the
TrueCopy for z/OS or TrueCopy Async Option dialog box) will be applied to all
TrueCopy for z/OS Async operations.