Determining the XCF protocol interface level
Beginning with z/OS® 
V2R2, zFS uses the enhanced log and enhanced status
APIs XCF communication protocols
and runs with sysplex=filesys.
This change requires toleration support on V1R13
and V2R1. For more information, see z/OS V2R2 Migration.
Message IOEZ00617I is issued during zFS initialization to indicate
whether zFS is running sysplex-aware on a file system basis (referred
to as sysplex filesys), sysplex-aware for all read/write
file systems (referred to as sysplex file-support), or
neither (referred to as sysplex admin-only). It also
indicates the zFS interface level that is being used:
- One of the following:
- The z/OS V2R2 level (with XCF protocol enhance
log and enhanced status APIs).
- The z/OS V2R1 level (with XCF protocol extended directory).
- The z/OS V1R13 level (with XCF enhanced connect protocol).
- The z/OS V1R12 level.
- The V1R12-compatible level that is used by z/OS V1R9 and z/OS V1R10.