HP XP P9500 Storage - Manual (Page 21)

Figure 14 Overview for Preserve Mirror Compatible FlashCopy function
The two methods to establish a Compatible FlashCopy relationship using the Preserve Mirror
Compatible FlashCopy function are:
•
REQUIRED: Perform the copying operation only when the Compatible FlashCopy relationship
can be established using the Preserve Mirror Compatible FlashCopy function. When the
relationship cannot be established, the command is rejected.
•
PREFERRED: Perform the copying operation using the Compatible FlashCopy-to-PPRC Primary
Volume function even if the Compatible FlashCopy relationship cannot be established using
the Preserve Mirror Compatible FlashCopy function. In this case, the Cnt Ac-S Z pair status
becomes Pending.
The following options are required when establishing a Compatible FlashCopy relationship using
the Preserve Mirror Compatible FlashCopy function.
•
DFSMSdss: FCTOPPRCPRIMARY(PRESMIRREQ or PRESMIRRPREF)
•
TSO: PRESERVEMIRROR(REQUIRED or PREFERRED)
•
ICKDSF: PRESERVEMIRROR(REQUIRED or PREFERRED)
•
ANTRQST Macro: PRESMIR(REQ or PREF)
The following options of Compatible FlashCopy-to-PPRC Primary Volume must be specified at the
same time.
•
DFSMSdss: FCTOPPRCPRIMARY
•
TSO: TGTPPRIM(YES)
•
ICKDSF: TGTOKASPPRCPRIM(YES)
•
ANTRQST Macro: TGTPPRIM(YES)
Notes:
•
Cnt Ac-S Z is required.
•
Only Cnt Ac-S Z synchronous pairs can be used.
•
Cnt Ac-S Z differential data must be stored in units of tracks. This function cannot be used
when differential data is stored in units of cylinders.
•
The two Cnt Ac-S Z pairs must be in Duplex status. If they are not in Duplex, the operation
differs depending on the specified option (PRESMIRREQ or PRESMIRRPREF).
•
It is recommended that you set the missing interrupt handler (MIH) timer to 45 seconds when
working with Cnt Ac-S Z synchronous pairs.
•
It is recommended that you turn ON system option mode 787 when sending a Host I/O to
secondary volumes using the Preserve mirror Compatible FlashCopy function. Depending on
Preserve Mirror Compatible FlashCopy Function 21