HP XP P9500 Storage - Manual (Page 139)

Figure 19 3DC multi-target configuration with FS or SS
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You can create either the Cnt Ac-S pair or the local FS or SS pair first.
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The Cnt Ac-S pair must be created before the intermediate FS or SS pair.
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You can create either the Cnt Ac-J pair or the local FS or SS pair first.
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The Cnt Ac-J pair must be created before the remote FS or SS pair.
Shared volumes in a delta resync configuration.
The following shows shared FS/SS volumes in a 3DC Cnt Ac-S/Cnt Ac-J delta resync configuration.
Figure 20 Delta Resync configuration with FS or SS
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The Cnt Ac-S, Cnt Ac-J, and Cnt Ac-J delta resync pairs must be created before intermediate
and remote FS or SS pairs.
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You can create a local FS or SS pair before or after the delta resync pairs.
Virtual LUN
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Continuous Access Journal supports the Virtual LUN feature, which allows you to configure
custom-size LU that are smaller than standard-size LUs. When custom-size LUs are assigned
to a Continuous Access Journal pair, the S-VOL must have the same capacity as the P-VOL.
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To perform Virtual LUN operations on a pair’s P-VOL and S-VOL, the pair must be deleted
and the volumes’ status returned to SMPL.
Virtual LUN 139