NUMAIOVPS

onconfig.std
value

None

if not present

(2 * number_of_chunks) or 6, whichever is greater; number_of_chunks is the number of chunks that you have allocated.

units

Number of AIO VPs

range of values

Integer greater than or equal to 1

takes effect

When shared memory is initialized

refer to

Asynchronous I/O in the chapter on virtual processors and threads in the IBM Informix: Administrator's Guide

NUMAIOVPS specifies the number of virtual processors of the AIO class to run. Unless kernel asynchronous I/O is implemented, the AIO virtual processors perform all the database server disk I/O, other than I/O to the log files.

If kernel-asynchronous I/O is supported on your platform, the database server uses AIO virtual processors to perform I/O only to regular (cooked) files that you have configured as chunks.

For information about using onmode -p, see Add or Remove Virtual Processors.