Re: fined grained data - At our site we mostly set 5 or 10 second polls in gmetad, and the same in the gmond confs. This was requested by our users. And yes, we have adjusted our RRD configuration in gmetad.conf to allow a few weeks of 5 second data.
Each of our ganglia severs handle up to 3000 hosts, although I once earlier had about 5,000 hosts on one servers. The monitored hosts are almost all windows servers doing HPC. The ONLY way that this is even remotely possible is by 1) reducing the number of collected metrics to a bare essential minimum for HPC (cpu, network, and I/O). The cygwin agent is unable to give much more anyway. 2) The RRD storage on servers of up to 100 gigabytes, is located on fast SAN storage. The sustained I/O has been up to 20 gigabytes a second sometimes. And as we all know, RRD stands for "Rapid Ruination of Disks". Why did users want such fine grained data? Well some groups wanted fine grained data to do "after the fact" forensics, some wanted immediacy to the graphs, some wanted to make sure that load spikes did not disappear, and others didn't know what they wanted. But now our user base is experienced with ganglia, some are reducing their poll rate (Some users want capacity trending only, say). Richard Grevis Production Architecture Barclays Capital, Canary Wharf, London, E14 4BB *DDI : +44 (0) 20 7773 4915 * richard.grevis > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of Martin Knoblauch > Sent: 16 January 2007 09:44 > To: Caleb Epstein; Grevis, Richard: IT (LDN) > Cc: ganglia-developers@lists.sourceforge.net > Subject: Re: [Ganglia-developers] Query "From->To" > > > Richard, > > I second the desire to have such a feature. But: where do > you get the fine grained data for "past periods" from? You > need to add datapoints to the RRDs. How big are your > databases compared to the default ones? > > But yes - useful feature. > > Cheers > Martin > --- Caleb Epstein <[EMAIL PROTECTED]> wrote: > > > On 1/15/07, [EMAIL PROTECTED] > > <[EMAIL PROTECTED]> wrote: > > > The changes have been useful to us internally here, but our HPC > > environment > > > is not really like most of the HPC clusters in academia and > > elsewhere, > > > which means I am unsure of the likely level of interest. Also a > > change > > > like the from/to mod may be too much of a change for people. > > > > I've always wished for a feature like this, personally. I think it > > would be a useful addition. > > > > -- > > Caleb Epstein > > > > > -------------------------------------------------------------- > ----------- > > Take Surveys. Earn Cash. Influence the Future of IT > > Join SourceForge.net's Techsay panel and you'll get the chance to > > share your opinions on IT & business topics through brief surveys - > > and earn cash > > > http://www.techsay.com/default.php?page=join.php&p=sourceforge &CID=DEVDEV > _______________________________________________ > Ganglia-developers mailing list > Ganglia-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ganglia-developers > > ------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de ------------------------------------------------------------------------ - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDE V _______________________________________________ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers ------------------------------------------------------------------------ For more information about Barclays Capital, please visit our web site at http://www.barcap.com. Internet communications are not secure and therefore the Barclays Group does not accept legal responsibility for the contents of this message. Although the Barclays Group operates anti-virus programmes, it does not accept responsibility for any damage whatsoever that is caused by viruses being passed. Any views or opinions presented are solely those of the author and do not necessarily represent those of the Barclays Group. Replies to this email may be monitored by the Barclays Group for operational or business reasons. ------------------------------------------------------------------------
