The CSD data set

The CICS® system definition (CSD) VSAM data set is unique in that it is a CICS system data set that is managed by CICS file control. For this reason the CSD can't be defined in the CSD, and is defined instead by system initialization parameters.

The recovery options equivalent to RECOVERY, FWDRECOVLOG, and BACKUPTYPE are CSDRECOV, CSDFRLOG, and CSDBKUP respectively. See Setting up shared data sets, CSD and SYSIN for information about defining the CSD.