KB Article #176723
CHSM01I:HSM Recall/Wait ... messages slow down the monitor
Problem
--CHSM01I:HSM Recall/Wait ... messages slow down the monitor throughput--huge impact on performances
--All transfers were delayed
--HSM migrated files
--parameter : &HSMASYNC=NO, HSM recall is synchronous
Resolution
Set CFT so it manage HSM recalls in an asynchronous way--set the parameter HSMASYNC to YES, default is NO
--SGINSTAL Macro - See A12OPTS JCL in the installation library
The default mode for migrated files is synchronous for compatibility reasons.
This feature (HSMASYNC) has been added years ago, before, it was always synchronous operations (and then, of course, hanging the CFT activity...)
It is then advised to turn this parameter to YES.
CFTTFIL tasks are not involved for a file found as migrated, after the stat on the file issue by CFTMAIN, the returned RC information for migrated file is received, the process repeats at CFTMAIN level until the stat command returns the expected RC to continue the process.