You can use the IMSID keyword on the ANALYZE control statement to specify one or more IMSIDs.
If you do not check this option,then the the default IMSID=ALL will be taken and all log records for all IMS systems that are associated with the input RECON data set (or data sets) will be considered.
Note:
If you specify the SLDS keyword, you cannot specify the IMSID keyword. The IMSID keyword applies only if CFA is reading RECON data sets to determine which log data sets to process.