A configuration keyword permits more flexible usage of multiple I/O channels. Without this feature, the ctDUPCHANEL file mode bit enables a file to use NUMCHANEL simultaneous I/O channels, where NUMCHANEL is set at compile time, and has traditionally been set to two. For superfile hosts with ctDUPCHANEL, 2* NUMCHANEL I/O channels are established. Two new server configuration keywords are now available for this feature:
SET_FILE_CHANNELS <file name>#<nbr of I/O channels>
DEFAULT_CHANNELS <nbr of I/O channels>
Note: When ctFeatCHANNELS is enabled, multiple I/O channels are disabled for newly created files. The multiple I/O channels take affect only on an open file call. Also, depending on default number of I/O channels, a superfile host not in the SET_FILE_CHANNELS will use no more than 2 * NUMCHANEL I/O channels.