HP XP7 Storage User Manual
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relationships, or create Compatible FlashCopy relationships after creating Cnt Ac-S Z pairs.
However, Compatible FlashCopy relationships can be created after creating Cnt Ac-S Z pairs only
when the following options are used:
•
DFSMSdss: FCTOPPRCPRIMARY
•
TSO: TGTPPRIM (YES)
•
ICKDSF: TGTOKASPPRCPRIM (YES)
•
ANTRQST Macro: TGTPPRIM (YES)
For details about using Compatible FlashCopy with Cnt Ac-S Z, see
The requirements of the FlashCopy-to-PPRC primary volume function are as follows:
•
The Cnt Ac-S Z program product is required for using the FlashCopy-to-PPRC primary volume
function.
•
The FlashCopy-to-PPRC primary volume function cannot be used for Cnt Ac-S Z pairs that are
registered in consistency groups.
•
Data that Compatible FlashCopy copies to Cnt Ac-S Z P-VOLs are transferred to Cnt Ac-S Z
S-VOLs asynchronously. Cnt Ac-S Z displays the progress of this asynchronous data transfer.
Depending on the timing of the Compatible FlashCopy and Cnt Ac-S Z copy operations, a
time delay may occur between the Compatible FlashCopy copy operation and the Cnt Ac-S
Z copy operation, and the Cnt Ac-S Z asynchronous data transfer may progress slowly.
•
If the Compatible FlashCopy S-VOL and T-VOL are both Thin Provisioning Z volumes, the
number of pages remaining in T-VOL may differ depending on the timing.
•
If you create Cnt Ac-S Z pairs or resynchronize suspended pairs when Compatible FlashCopy
relationships exist, Compatible FlashCopy prepares as many copies as the number of
relationships. The larger the number of relationships per volume, the longer it takes for Cnt
Ac-S Z pairs to become Duplex. Even with lower load, it takes approximately 1.5 times as
much time as when the Cnt Ac-S Z pairs are not used with FlashCopy.
When using the Preserve Mirror FlashCopy function, it is recommended that the maximum
number of relationships (or data sets) per volume should be 2000 or less. If that is not possible,
you should create and operate one relationship for each volume. This causes non-data-set
parts to be copied as well, but the status of the Cnt Ac-S Z pairs will change to Duplex in a
shorter time.
Copying between FlashCopy relationships and Cnt Ac-S Z pairs (Compatible
FlashCopy only)
The following figures show the copy process of Compatible FlashCopy relationships and Cnt Ac-S
Z pairs by the FlashCopy-to-PPRC primary volume function.
FlashCopy-to-PPRC Cnt Ac-S Z primary volume function (Compatible FlashCopy only)
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