Has anyone found a way to reduce the length of time that Virtualization Manager keeps data? It's currently eating ~100gb/week for me, which is a little ridiculous, in my opinion.
You can change the retention settings from the Setup -> System Properties. Change the "Days to Retain Raw Performance Data" and "Days to Retain Performance Data Hourly Rollups" values. Raw data is retained for the length of the first value. The system also generates hourly data that is an average of the values of the previous hour. The default settings will keep the raw data for 14 days before deletion, and the hourly data is kept for 3 months.
Saying that, I'm not entirely sure that you should be generating that much data but it would depend on the number of hosts and VM's you're monitoring, and your collection schedule.
This may also help:
100 GB/week is pretty high. I suggest that you contact support team, they will look at it deeply and try to help you.
I did Shuth's suggestion, and also expanded the disk. It's up to 400gb consumed (we've 1200 vm's that it's monitoring, FYI). I couldn't find the field to alter the months to keep alerts or trends? I thought that might be simply because that isn't a function we've utilized (we 'extract' the widgets from the dashboard and drop them onto a web page with similar information from a couple other utilities, and have a nice, aggregate collection of different information from our environment).
The months.to.keep.. property is available from VMAN 6.0. Please upgrade to newest version.