This log stream is used only if one is specified in the IGDSMSxx member of SYS1.PARMLIB or the CICS® definition. Definition of the log of logs is optional. If you define a log of logs, it must be present; otherwise, DFSMStvs jobs would fail. It contains copies of the tie-up records and file-close records written to forward recovery logs and is used by forward recovery utilities, such as CICSVR, to automate the forward recovery process.