[rrd-users] Sanity checks on Buffer Cache and I/O at peak aggregation times

[Rick Jones]

> the 'problem' is that a disk block which is only hit once a day
> will most likely not stay in buffer cache, so as rrdtool goes in to
> update the slow RRAs, it will first have to read the block in order
> to then update it ...

It may not be sufficient, but under Linux at least there is the 
posix_fadvise() call - might that enable rrdtool to request the cache to 
retain file sections of particular interest?

rick jones