LOSTMSG

LOSTMSG(ON) detects lost and duplicate XCF messages in a shared file system configuration. It is ignored if the file system does not have a shared file system configuration; for example, when SYSPLEX(NO) is specified. While LOSTMSG can be specified differently for each member in the sysplex, the same LOSTMSG setting should be specified throughout the sysplex. To disable the detecting of lost and duplicate messages, specify LOSTMSG(OFF).

Tip: Do not use LOSTMSG(ON) when z/OS UNIX sysplex traffic is high, such as when many file systems that are not sysplex-aware are being accessed remotely, because performance might be affected.

LOSTMSG(ON) is the default.