42 Business Copy XP (BC) for the XP10000/XP12000
• Use BC to provide on-site backup copies of Continuous Access XP Journal P-VOLs and S-VOLs
• Use Continuous Access XP Journal to provide remote backup of BC P-VOLs
Figure 17 BC and
Continuous Access XP Journal: Shared P-VOL and P-VOL and P-VOL and S-VOL
NOTE: Usually Continuous Access XP and Continuous Access XP Journal can share volumes with BC.
However, in some cases, you cannot create BC pairs using volumes shared with Continuous Access XP and
Continuous Access XP Journal. For more information about combining BC, Continuous Access XP, and
Continuous Access XP Journal, see Figure 22 and Figure 23.
Combining BC and Continuous Access XP operations
BC and Continuous Access XP can function together in the same disk array to provide both internal and
remote backup for important data.
NOTE:
• BC is recommended for intra-disk array copy operations. If BC is not installed, use
Continuous Access XP
(synchronous only) to copy within the same local disk array. This
Continuous Access XP configuration
requires at least one external ESCON® cable loop (minimum of two is recommended).
• Combining BC L1 and L2 pairs with
Continuous Access XP volumes is allowed. Continuous Access XP
considers node and leaf volumes secondary volumes (S-VOLs).
NOTE: Reverse resync and quick restore operations cannot be performed on BC/Continuous Access XP
shared volume pairs.
The configuration shown in Figure 18 is an example of a volume functioning as both a Continuous Access XP
P-VOL and BC P-VOL. With this configuration, you can perform the following:
• Use BC to provide on-site backup copies of
Continuous Access XP P-VOLs
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