The graphs are produced by a web frontend (I forget the name) that reads from Collectd data. Collectd runs on each box and collects performance data that can be graphed on a central box.
We used Munin previously, and I must admit that Collectd feels like a step backwards. Both are very primitive, so we might look for something better soon, perhaps Graphite.
I recommend migrating to Linux (or one of the BSDs) if you want to get serious about system administration. The wealth of mature tools is vastly superior.
The Postgres book by Greg Smith is indispensible if you want to tune a Postgres installation.
We used Munin previously, and I must admit that Collectd feels like a step backwards. Both are very primitive, so we might look for something better soon, perhaps Graphite.
I recommend migrating to Linux (or one of the BSDs) if you want to get serious about system administration. The wealth of mature tools is vastly superior.
The Postgres book by Greg Smith is indispensible if you want to tune a Postgres installation.