HP StorageWorks XP Remote Web Console Software - Manual (Page 27)

ShadowImage for z/OS user guide 27
NOTE: Available option types depend on the XP128/XP1024/XP10000/XP12000 settings.
Swap&Freeze Option
The Swap&Freeze option allows the S-VOLs of an SI390 pair to remain unchanged after the quick restore
operation. If the quick restore operation is performed on an SI390 pair with the Swap&Freeze option,
update copy operations are suppressed, and thus are not performed for pairs in the duplex status after the
quick restore operation. If the quick restore operation is performed without the Swap&Freeze option, the
S-VOL and T-VOL are resynchronized when update copy operations are performed for pairs in the duplex
status.
NOTE: Verify that the Swap&Freeze option remains in effect until the pair status becomes duplex after the
quick restore operation.
The following figure shows the state of the T-VOL after the quick restore operation with or without the
Swap&Freeze option.
Figure 6 Quick Restore operation with or without Swap&Freeze option
The Quick Restore pairresync operation on a pair with split status exchanges data in the pair’s S-VOL and
T-VOL. If you use the Swap&Freeze option when performing the Quick Restore pairresync operation, the
update copy operation does not take place after the Quick Restore pairresync operation is complete.
Therefore, data on the S-VOL and T-VOL is kept exchanged. If you do not use the Swap&Freeze option
when performing the Quick Restore pairresync operation, the update copy operation takes place after the
Quick Restore pairresync operation is complete, and data on the S-VOL overwrites the T-VOL.
Host I/O Performance Option
The Host I/O Performance option improves host I/O responses over SI390 copying processing time. When
the Host I/O Performance option is used, the disk array suppresses execution of SI390 copying processing,
and consequently the host I/O responses improve.
FCv2 Slower
Copy1
You need to set FCv2 Slower Copy2 option
invalid.
FCv2 Slower
Copy2
FCv2 Slower Copy1 option suppresses the
copy operations by FlashCopy Mirror Version
2, and prioritize the host I/O operations. For
details, see ” Fcv2 Slower Copy2 Option” on
page 28 .
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Table 6 Types of ShadowImage options (continued)
Option Type Features Requirement