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

Performing TrueCopy for z/OS Configuration Operations 5-55
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
– To omit the settings, right-click the preview list, and click Delete. The
changes are cancelled.
– To cancel all operations, select all the operations in the preview list, right-
click, and click the Delete command or click the Cancel button.
– To display error code, right-click the preview list, and click Error Detail.
Error code is displayed on the rightmost the preview list.
6. To apply the settings, click Apply.
If an error occurs in the setting, an error code is displayed in the Error Code
column in the preview list. To display the error message, right-click on the
list, display the pop-up menu and click Error Detail. After you check the
error message, click OK button to close the error message. If necessary,
please remove the cause of the error message.
Figure 5-17 System Option Dialog Box
The Maximum Initial Copy Activities setting specifies the number of
concurrent initial copy operations. You can set a number from 1 to 512. The
default setting is 64 volumes. TrueCopy for z/OS initial copy activities can
impact the performance of the main storage system, depending on the amount
of I/O activity and the number of pairs being registered at the same time. The
maximum initial copy activities setting of 64 volumes allows you to limit the
impact of initial copy activities on storage system performance. For example, if
you set the maximum initial copy activities to 64 volumes and then add 65
TrueCopy for z/OS pairs at the same time, the MCU starts the first 64 pairs
and will not start the 65th pair until one of the first 64 pairs is synchronized
(Duplex status). When you change the maximum initial copy activities setting,
the new setting applies to pairs created after the setting was changed, not to
existing pairs.
The Maximum Initial Copy Activities (CU) setting specifies whether the
CU-by-CU setting of concurrent initial copy operations will be enabled or
disabled. If it is enabled, you can specify the CU-by-CU setting of concurrent
initial copy operations, and if it is disable, you cannot specify the setting.