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seen Sep 17 at 14:33

comment very specific iostat output needed in realtime
glad to hear you're enjoying it. have you discovered colmux yet? basically it talks to multiple collectl's across a cluster and provides output like top, but unlike top which only shows top processes, with colmux you can show top-anything! for example, with colmux I was able to find a few dozen misconfigured servers which were using 10GB+ of system buffers out of several thousands in just a few minutes.
comment glob in perl doesn't work on RHEL 6.2 webserver
good suggestion, but I did think of that and it worked correctly. sorry I forgot to mention it. keep those suggestions coming though...
comment glob in perl doesn't work on RHEL 6.2 webserver
there are definitely files in /tmp. I've also extended my testing to try this on a fedora 16 system and am getting the same results. I even expanded the test to make it more interesting by looking at both /usr/* and a new directory /tmp2/*. It reports the correct number of files in all 3 when run from a shell, but reports 0 for both /tmp and /tmp2 when run from a webserver. I am running perl 5.14 on fedora.
comment How to tell is apache is configured to use perl?
excellent, so mod_perl IS installed, which is what I would have expected. In fact I just copied my script to the cgi-bin directory and it does execute, so now for the more exotic because that's now what I want.
comment Ganglia network stats incorrect
hmm, I guess the obvious next question is what is your definition of wonky? from my experience virtual ALL tools get their data from the same place which in the case of disks is /proc/diskstats. When I was developing collectl I always verified its data with tools like iostat for disk data. I'd run collectl and (or iostat if you must ;)) and compare their output. If there really is a difference, file a bug with the ganglia team, provided of course you understand why there is a difference.