ioBufferSize¶

Size of the buffer used to writing output data.

This parameter applies to omfile: File Output Module.

Name:: ioBufferSize
Scope:: action
Type:: size
Default:: action=4 KiB
Required?:: no
Introduced:: at least 5.x, possibly earlier

Description¶

Size of the buffer used to writing output data. The larger the buffer, the potentially better performance is. The default of 4k is quite conservative, it is useful to go up to 64k, and 128k if you used gzip compression (then, even higher sizes may make sense)

Action usage¶

action(type="omfile" ioBufferSize="...")

Legacy names (for reference)¶

Historic names/directives for compatibility. Do not use in new configs.

$OMFileIOBufferSize — maps to ioBufferSize (status: legacy)

See also¶

See also omfile: File Output Module.

Support: rsyslog Assistant | GitHub Discussions | GitHub Issues: rsyslog source project

Contributing: Source & docs: rsyslog source project

© 2008–2025 Rainer Gerhards and others. Licensed under the Apache License 2.0.