HP XP7 for Compatible FlashCopy Mirroring User Guide (TK940-96001)

Figure 19 Pair configuration: Compatible FlashCopy S-VOL shared with Business Copy Z
Usually, you need to specify an unpaired volume (Simplex status) as a copy source (S-VOL) or a
copy target (T-VOL). When you specify an BC Z S-VOL as a copy source, you can establish a
Compatible FlashCopy relationship only if the BC Z pair is not in Resync-R/REVRSY status.
You can establish or release a Compatible FlashCopy relationship if you meet the requirements
described above. When there is a Compatible FlashCopy relationship, you cannot perform the
backward resynchronization (Reverse Resync or Quick Restore) on the BC Z pair.
Even if the BC Z S-VOL already has three T-VOLs, you can create up to 16 pairs by specifying the
volumes of Compatible FlashCopy relationships as the copy source.
In the following cases, you cannot create BC Z pairs (see the following figure).
• Compatible FlashCopy S-VOL and the T-VOL of the BC Z pair are shared.
• Compatible FlashCopy T-VOL and the T-VOL of the BC Z pair are shared.
• Compatible FlashCopy T-VOL and the S-VOL of the BC Z pair are shared.
When you use Compatible FlashCopy volumes, you cannot create pairs sharing the volumes shown
in the following figure.
Figure 20 Compatible FlashCopy and BC Z: Non-Sharable combination
Using Compatible FlashCopy with Continuous Access Synchronous Z
Volumes that can be shared:
The following tables describe the combinations of the volumes when you share Compatible
FlashCopy and Cnt Ac-S Z volumes.
28 About Compatible FlashCopy