When the S-VOL is larger than the mapped external volume P-VOL, you must adjust the capacity of the volume.
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Decrease the size of the S-VOL
by creating a custom volume (CV) as shown in the following figure.
Base the CV capacity on Blocks, which displays in the Capacity column on the LDEV Information dialog box in Device Manager - Storage Navigator. See the Provisioning Guide for instructions on creating CVs.