Space announcement We are no longer updating this space, and you cannot comment on this space. The IMAGE COPY PLUS component is now documented in BMC AMI Backup and Recovery for IMS.

Buffers

When you are using the native access method, you can specify the number of buffers for an input data set group or area manually.

The utility always allocates buffers below the 16 MB line when you are using native access methods. The number of buffers that you specify affects the performance of the utility. Generally, the more buffers you use, the better the performance. However, if you have a heavy paging environment, fewer buffers may give you better performance.

When EXCP is used to read an input file, the number of buffers is always equal to two cylinders of input data. The utility allocates these buffers above the 16 MB line.

When the start I/O access method is used to read the input file, the number of buffers is always equal to two cylinders of input data. These buffers are allocated in PAGE FIXED storage. The utility allocates these buffers above the 16 MB line.

 

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