Home > Storage > PowerScale (Isilon) > Industry Solutions and Verticals > Media and Entertainment > PowerScale OneFS with Baselight by FilmLight: Best Practices and Configuration > Enabling Direct IO
While Direct IO is not an NFS mount option, it does affect storage performance. Direct IO can be configured when setting up external storage options in Baselight, as described in Setting volume mount options in FilmLightOS.
Direct IO bypasses some memory caching in Linux. In this case, with Baselight reading directly from PowerScale, testing showed that enabling Direct IO improved write performance and degraded read performance. Baselight provides configurations to use Direct IO only for writes and not reads. This option can be configured in the /usr/fl/etc/volume.cfg file with the directio=write option.