Greetings, listers,
We've got an on-going issue with i/o contention. There's the obvious problem
that we've got a whole lot of things all writing to the same partition. In
this case, there's just one big chunk of RAID 5 disk on a single controller so
I don't believe that making more partitions is going to help.
On this same partition we have:
1) Nagios 3.2.1 running as the central/reporting server for a couple of other
Nagios nodes that are sending check results via NSCA. Approximately 6-7K
checks.
2) pnp4nagios 0.6.2 (with rrd 1.4.2) writing graph data.
There's a 2nd server configured identically to the first that's acting as a
"hot spare" so it also receives check data from the 2 distributed nodes and
writes its own copy of the graph data locally as well.
At the moment I'm concerned about the graphdata, but because I can only see i/o
utilization as an aggregate, I can't tell what is the worst component on that
filesystem -- status.dat updates? graph data? writes to the var/spool
directory? We also look at continued growth so this is only going to get worse.
These systems are quite lightly loaded from a CPU (2 dual-core CPUs) and memory
(4GB) perspective, but the i/o to the nagios filesystem is queuing now.
We're about to order new hardware for these servers and I want to make a
reasonable choice. I'd like to make some reasonable changes without requiring
too exotic of a setup. I believe these servers are currently Dell 2950s and
they're all running Suse Linux 10.3 SP2.
My first thought was to potentially move the graphs to a NAS share which would
shift that i/o to the network. I don't know how that would work though and it
would ultimately be an experiment.
What experiences do people out there have handling this kind of i/o and what
have you done to ease it?
Thanks very much!
Mark
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