Markus Reusch wrote:
Hi list(eners),we are using Ganglia for about 20-30 AIX-Systems. All data is collected on 2 LPARs which run gmetad, rrdtool and the Apache, so it's accessible for the users with the supplied PHP web frontend. Our rrd-database has currently a size of about 400 MB and consists of about 4800 files. I have no idea if this size or number of files is a problem at all.
That actually seems high. On a cluster with 88 computers, there are 3238 files in about 40MB. The total size should scale proportionally to the number of hosts and metrics.
Every day, several users connect to the web frontend and open those graphs, which results in some rrdtool calls, exhausting all the available CPU time of the machine. No matter if it's just 4 rrdtool processes or 20 of them. The machine is already at it's limit when
What version of rrdtool? There was a recent discussion about this in the mailing list. I think that versiosn 1.2.21 has a problem. There should be one rrdtool process called per graph, and it should be fairly short-lived.
The LPAR has AIX 5.3 with 1 * 1,7 MHz CPU and 2 GB RAM. VMM is tuned and machine is usually not paging at all. Not a strong machine but we thought sufficient for Ganglia + rrdtool + Apache.
That should be fine.
My questions:Is it normal behaviour/configuration, that so many rrdtools are started when people are doing some requests to the web frontend? Do you guys spend a "big" box just running Ganglia + rrdtool + Apache or maybe just a small Intel/Linux box and it runs smooth?
Your hardware should be fine, unless the users are constantly hitting the reload button every second. Maybe AIX is doing something wonky, but I haven't touched it since before Deep Blue beat Kasparov.
-- Jesse Becker NHGRI Linux support (Digicon Contractor)
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