Back in December, the systems administrators at The National Capital Freenet gave me a new disk for the news spool. Since that time, the free disk space has been hovering around 75%, which is kind of ridiculous. So around the middle of ‘Week 16″ in the following graphs, I extended the retention of a bunch of newsgroup hierarchies (mostly the big8, the local ones, and Canadian regional heirarchies) by a couple of days. After waiting a week to see where it stabilized, it made almost no difference – it was now hovering around 70-72% free. Big fucking deal.
So on Week 18 I took a more drastic cut, and added 10-15 days to the retention time of all those groups. It has been scary for the last couple of weeks watching that graph on a steady downward trend, holding my breath hoping it would level out before it hit bottom.
Well, here it is Week 20, and it looks from the graphs that I’ve levelled out at around 50% free. That’s much better. That gives me room to deal with floods, but keeps most groups as long as is practical. Personally, I’ve never seen the point of keeping any groups except *.answers for more than 30 days – you know that if you chime in on a discussion that ended 30 days ago you’re going to be pissing off the majority of people who read it and moved on. And every point that’s made in a discussion that’s been going on for more than 30 days will have been repeated dozens of times in the last 30 days.
Anyway, I find these graphs fascinating. On the Monthly graph you can see this lovely sawtooth as the spool fills up during the day, then quickly goes the other way during the expire run. You can see the wierd little mini-spikes when I made my adjustments and run the news.daily expire run a couple of times in one day to make sure I hadn’t messed anything up, and then you can see the much smaller spikes while the groups whose retention time was increased stopped expiring anything while groups that I didnt’ mess with continued to expire things.
I like these graphs, and I wouldn’t mind having them for my home system and my linode, but on the other hand what I’ve seen of MRTG looks way too complicated for something as simple as monitoring disk space.