Hello,Thank you for your advice. I currently write the files to a hardware raided SAN over gig ethernet, which is also mounted by ou webserver which displays the graphs.
I tried exporting the tmp/ramfs to the the webserver, but RHEL 5 doesn't seem to support this.
This is my data source line: data_source "Cluster" 60 localhost:8650 grep ^RRA gmetad.conf returns no results.The iostat returns some iowaits up around 25 at first glance, but i would suppose i would have to match up the iowait when the gaps are occuring?
Thanks again for you input, and I welcome any insight. -Cassandra Daniel Pocock wrote:
This is most likely an I/O related issue. So please try Ofer'sUse iostat to check your IO levels and see if that is definitely the cause, e.g.$ iostat -k 1 -xsuggestion by putting your RRD files onto tmpfs. An alternative solution is to put the RRD files onto a (small) RAID that could provide higher I/O, or potentially SSDs (if cost is not an issue).Please share the following with us: grep ^RRA gmetad.conf and also tell us your polling interval.Review the XFF parameter in your RRA definition (see the rrdtool man pages for an explanation)Some very big sites use that in production already - it is backported on the 3.1.3/4/5 betas - it is highly recommendedThe code from trunk does support the new rrdcached feature that comes with newer versions of RRDTool, but that code is currently still in development.
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