HP XP P9000 for Compatible FlashCopy Mirroring User Guide (AV400-96600, January 2014)

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