212 IMS in the Parallel Sysplex, Volume I: Reviewing the IMSplex Technology
9.1.4 Components
The global online change components are:
OLCSTAT data set
– Global online change status data set (like MODSTAT data set)
RM address space
– At least 1 RM required in IMSplex defined with CSL
– Only one RM allowed in IMSplex with no resource structure
Common Service Layer address spaces
– OM required for new online change commands
– SCI required on each z/OS image
RM clients (IMS subsystems)
– Each IMS DB/DC, DCCTL, or DBCTL subsystem is a client
Coupling Facility list structure (resource structure)
– Resource structure contains IMSplex-wide process information and global resources
– Resource structure is optional
Common Queue Server (CQS)
– Requi