In contrast to the SET command, which allows an installation to specify a different IECIOSxx parmlib member, the SETIOS command can dynamically change the missing interruption handler (MIH) or I/O timing (IOT) parameter. The parameters can appear in any order in the command, but there can only be one DEV and TIME parameter pair or DEV and IOTIMING pair in a command. You can create user classes for particular situations such as test environments and special job processing.
In addition, you can use the SETIOS command to do
the following:
- Enable or disable the dynamic channel path management function.
- Refresh the control unit model table for the single point of failure detection function in dynamic channel path management.
- Enable or disable the gathering of FICON® switch statistics.
- Enable or disable the MIDAW facility.
- Enable or disable UCB overlay protection.
- Indicate whether IOS blocks are obtained in 24 or 31 bit storage.
- Indicate the actions to be taken for an IO Timing HyperSwap® trigger.
- Indicate the use of HyperPAV mode for the system.
- Enable or disable the encryption key management.
- Enable or disable the IOS recovery functions.
- Enable or disable the zHPF facility.
Enable or disable IBM® zHyperWrite data
replication.