I write this post because I want to view historic data from ganglia.
The problem is when hosts go down, we cannot view the historic data of the down's host.
If you restart gmetad service, we will lost list of down's hosts although rrd files still persist in /var/lib/ganglia/rrd . It's hard to dump rrd files to a pretty graph like ganglia web frontend
The way to solve this problem has 2 steps.
First, If hosts go down and list of host still persist...
