Channel to Channel adapters communicate between the CA Vtape started tasks on z/OS and the CA Cloud Storage for System z Server running on the Linux system. Using CTCs lets data be moved between hosts quickly, using the fewest general processer resources. CA Cloud Storage for System z combines multiple CTC addresses between hosts to facilitate multiplexing read and write operations for a variable number of virtual tape drives. CA Cloud Storage for System z requires two CTC addresses between each instance of CA Vtape on z/OS and Linux on System z.
Installations that have a FICON channel connected to the I/O fabric can have CTC connections set up with no additional cost. Installations no longer need to dedicate channel path (CHPID) resources to the CTC function. you can make CTC connections between channels by going through a FICON Director. The CTC adapter function is implemented logically between connecting channels and resides in the FICON channel.
The following diagram shows a single z/OS LPAR communicating with a Linux on System z host:
The following is a diagram of two z/OS LPARs communicating with a single Linux on System z host:
The IBM System z ESCON and FICON Channel-to-Channel Reference Guide and the z/OS Hardware Configuration Definition User’s Guide contain basic information, definition, and configuration information for CTCs.
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