When you issue a REQUEST=REG_NAMELIST request, you must identify the buffer that contains the set of registration blocks that specify the data items. Note that the BUFFER specification for REG_NAMELIST requests differs in its addressability requirements from other IXLCACHE requests that use BUFFER. You must use a single buffer (the BUFFER keyword), which is addressable from your primary address space or from your PASN access list. The size of the buffer can be larger than that actually required to hold the maximum (32) number of registration blocks. However, creating a buffer larger than required could result in a performance degradation.

For information on selecting buffer attributes, see Selecting a Data Buffer For a Request.