Advanced Topics › Communication Methods › CTCONLY
CTCONLY
The CTCONLY communication method has the control file located in virtual storage in a master CA MIM address space and passed from the master to client systems through CTC devices.
Benefits
- Allows the MIMplex systems to be any combination of sysplexed and non-sysplexed images
- High performance, especially for CA MII sites
- Requires no shared DASD control file
- Requires no coupling facility structure control file
- Provides backup master system capability in case of master system failure
- Is not subject to contention delays associated with DASD I/O
Requirements
- A 3088 or extended mode ESCON CTC devices connecting at least one system to all others in the MIMplex
- At least one CA MIM address space defined to manage the virtual control file (VCF)
- At least one checkpoint file defined on each system in the MIMplex
