z/OS MVS Programming: Sysplex Services Guide
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Selecting the Buffering Method

z/OS MVS Programming: Sysplex Services Guide
SA23-1400-00

The system returns the data from the read cast-out class request to the local buffers that you specify. You can receive data in either a single buffer (the BUFFER keyword) or in multiple buffers (the BUFLIST keyword). Both methods enable you to receive up to 65536 (64K) bytes of data. For information about whether to use a single buffer or multiple buffers and for information on selecting buffer attributes, see Design Considerations for Choosing the Buffer Format.

If your local cache buffer is not large enough to hold all of the available data, the system fills the buffer, ends the request, and returns a specific return and reason code that indicates that the buffer has been filled. After you finish processing the data that is in the buffer, you can restart the request to have the system return the remaining data to the buffer. For information on restarting a request, see Restarting a Request that Ends Prematurely.

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