The environment variable EPICS_CA_MAX_ARRAY_BYTES determines the size of -the largest array that may pass through CA. This parameter must be set -appropriately for both the CA client and the CA server. In EPICS R3.14 CA -maintains a free list of 16384 byte network buffers that are used for -ordinary communication. If EPICS_CA_MAX_ARRAY_BYTES is larger than -16384 then a second free list of larger data buffers is established when -clients request transportation of large arrays.
+Starting with version R3.14 the environment variable +EPICS_CA_MAX_ARRAY_BYTES determines the size of the largest array that may +pass through CA. Prior to this version only arrays smaller than 16k bytes +could be transfered. The CA libraries maintains a free list of 16384 byte +network buffers that are used for ordinary communication. If +EPICS_CA_MAX_ARRAY_BYTES is larger than 16384 then a second free list +of larger data buffers is established and used only after a client send its +first large array request.
+ +The CA client library uses EPICS_CA_MAX_ARRAY_BYTES to determines the +maximum array that it will send or receive. Likewise, the CA server uses +EPICS_CA_MAX_ARRAY_BYTES to determine the maximum array that it may send or +receive. The client does not influence the server's message size quotas and +visa versa. In fact the value of EPICS_CA_MAX_ARRAY_BYTES need not be the +same in the client and the server. If the server receives a request which is +too large to read or respond to in entirety then it sends an exception +message to the client. Likewise, if the CA client library receives a request +to send an array larger than EPICS_CA_MAX_ARRAY_BYTES it will return +ECA_TOLARGE.