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Figure 19 BC and Continuous Access XP: shared P-VOL/S-VOL
CAUTION:
When you shar
eaBCP-VOLwithaContinuousAccessXPS-VOLasshowninFigure 19,thewrite
operation to the Continuous Access XP P-VOL takes time. Especially, when the BC pair is in the PSUS(SP)
status,thewriteoperationtotheContinuousAccessXPP-VOLmaytakeextratimeduetothetimefor
copying to t
he BC pair. In addition, in the case of Continuous Access XP Asynchronous, the Continuous
Access XP pa
ir may be suspended and fail due to a shortage of capacity in its side file.
The configuration shown in Figure 20 is an example of a volume functioning as both a Continuous Access
XP P-VOL and BC P-VOL, while the S-VOL of the same Continuous Access XP pair is also functioning as
the P-VOL of another BC pair. With this configuration, you can perform the following:
• UseBCtoprovideon-sitebackupcopiesofContinuousAccessXPP-VOLsandS-VOLs
• Use Continuous Access XP to provide remote backup of BC P-VOLs
Figure 20 BC and Continuous Access XP: shared P-VOL/P-VOL and P-VOL/S-VOL
The configuration shown in Figure 21 is an example of a volume functioning as both a BC S-VOL and
Continuous Access XP P-VOL. With this configuration, you can use Continuous Access XP to provide
asynchronous remote copy.
NOTE:
This configuration does not allow BC and Continuous Access XP to copy at the same time. Create the
BC pair first, and then split the pair before creating the Continuous Access XP pair. You must suspend
the Continuous Access XP pair to resync the BC pair. The Continuous Access XP pair status cannot be
changed when the BC pair is in PSUS(SP) status.
Business Copy XP user guide
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