HP StorageWorks XP Remote Web Console Software - Manual (Page 40)

WARNING!
If the FCv2 Slower Copy2 option is in effect, FCv2 Slower Copy1 option becomes invalid.
NOTE:
•
When copying processing of FlashCopy Mirror V2 is suppressed by the FCv2 Slower Copy1 option,
the time taken for copying increases. Since the copying processing time of pairs is not always same,
the copying processing time is not necessarily doubled.
• If Siz pairs or FlashCopy Mirror V2 pairs exist in the same parity group, host I/O responses might
not be improved.
FCv2 Slower Copy2 Option
The FCv2 Slower Copy2 option is used to improve host I/O responses over copying processing time
of FlashCopy Mirror V2 pairs. When the FCv2 Slower Copy2 option is in effect, the number of the
FlashCopy Mirror V2 pairs that can be copied simultaneously are suppressed to one-quarter, and
consequently host I/O responses improve.
The FCv2 Slower Copy2 option and the FCv2 Slower Copy1 option basically have same function. The
difference between these two options is that you can more improve host I/O responses by using the FCv2
Slower Copy2 option than by using the FCv2 Slower Copy1 option. This happens since the FCv2 Slower
Copy2 option suppresses more copy operations compared to the FCv2 Slower Copy1 option.
WARNING!
If the FCv2 Slower Copy2 option is in effect, FCv2 Slower Copy1 option becomes invalid.
NOTE:
•
When copying processing of FlashCopy Mirror V2 is suppressed by the FCv2 Slower Copy2 option,
the time taken for copying increases. Since the copying processing time of pairs is not always same,
the copying processing time does not necessarily quadruple.
• If Siz pairs or FlashCopy Mirror V2 pairs exist in the same parity group, host I/O responses might
not be improved.
At-Time Split Function
To use the At-Time Split function, you need Business Continuity Manager software. Business Continuity
Manager software is executed from a host server. To perform the split operation by using the At-Time
Split function, you must specify a copy group or register the split time in the copy group. The split time
indicates the time when you want to store the S-VOL data to the T-VOL.
For example, if you register the consistency group of Siz as the copy group of the Business Continuity
Manager, the At-Time Split function allows you to copy data from the Siz S-VOLs in the same consistency
group to the T-VOLs simultaneously. The T-VOLs contain the same data as the S-VOLs when the Split
operation is performed.
For information about using Business Continuity Manager, see theHP StorageWorks XP for Business
Continuity Manager Software User’s Guide.
A Siz consistency group is a user-defined set of Siz volume pairs used for the At-Time Split function.
For information about adding, deleting, and viewing the Siz consistency groups, see section
“ Hitachi ShadowImage for z/OS CTG Operation Window ” on page 94.
Keep the following in mind when working with Siz consistency groups:
40 Overview of Hitachi ShadowImage for z/OS Operations