(PECL rrd >= 0.9.0)
rrd_tune — Tunes some RRD file header options.
Change some options in the RRD header file. E.g. renames the source for the the data etc.
Filename for the RRD database file.
Options with RRD database file properties, which will be changed. See rrd tune man page for details.
Returns TRUE on success, FALSE otherwise.