Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

2-24 About TrueCopy for z/OS Operations
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Note: Cache Residency Manager operations may decrease the total amount of
cache available for TCzA and CC operations but do not directly affect sidefile
cache usage. Available cache is defined as the amount of physical cache
memory installed on the storage system minus any cache reserved for the
Cache Residency Manager feature.