Reliability of looking glass sites / rviews

[Matthew Huff <mhuff () ox com>]

This weekend our uninterruptible power supply became interruptible and we lost all circuits. While I was doing initial 
debugging of the problem while I waited on site power verification, I noticed that there was still paths being shown in 
rviews for the circuit that were down. This was over an hour after we went hard down and it took hours before we were 
back up.

I worked with our providers last night to verify there weren't any hanging static routes, etc... We shut the upstream 
circuit down and watched the convergence and saw that eventually all the paths disappeared. Given what we saw on 
Saturday, what would cause route-views to cache the paths that long?  Some looking glass sites only show what they are 
peered with or at most what their peers are peered with, that's why I've always used route-views.

What looking glass sites other than route-views would people recommend?