Well, I would say in any circumstance where you care about performance or the availability of your data. Obviously the gold standard is bare metal. A search on google for "aws guaranteed different physical machines" yielded this aws forum thread from 2006, https://forums.aws.amazon.com/message.jspa?messageID=55112. Things may have changed since then. But I use linode which tells you which physical hardware your vm is on.
On Feb 21, 2013, at 9:43 PM, Kevin Burton <[email protected]> wrote: > How strict is this “Under no circumstances should you have more than one VM > (one logical node in a Riak cluster) on the same physical hardware” rule? It > doesn’t fit my situation but there has to be some leniency because Riak has > to work in a cloud and you are not guaranteed that your provisioned VM will > be on different physical hardware than the other nodes. > > From: Alexander Sicular [mailto:[email protected]] > Sent: Thursday, February 21, 2013 8:27 PM > To: Kevin Burton > Cc: 'Sean Carey'; [email protected] > Subject: Re: Tuning a Riak cluster. > > It can't be said enough times but the number one thing you can do to ensure > that you are getting true performance (not to mention redundancy) is to use > different physical hardware for each of your nodes. Under no circumstances > should you have more than one VM (one logical node in a Riak cluster) on the > same physical hardware. Also, use multiple > connections/threads/parallelism/whatever on client side and be sure to hit > all the nodes in the cluster haproxy roundrobin-esque when writing to Riak. > Everything else is in the noise. > > -Alexander Sicular > > @siculars > > On Feb 21, 2013, at 9:04 PM, Kevin Burton <[email protected]> wrote: > > > > There each has about 20-30GB of disk space. They each are a VM so I am not > sure how to specify the CPU. They all seem to be 64 bit Intel processors but > I could tell you the clock speed. The network is 1Gb Ethernet. > > From: Sean Carey [mailto:[email protected]] > Sent: Thursday, February 21, 2013 7:59 PM > To: Kevin Burton > Cc: [email protected] > Subject: Re: Tuning a Riak cluster. > > Kevin, > Disk and CPU, and Network? > > > Sean Carey > @densone > > On Thursday, February 21, 2013 at 20:31, Kevin Burton wrote: > > > I have a cluster of 4 machines (4 Linux VM machines each allocated about 1 Gb > of memory – yea I know it isn’t a lot). I would like to get some pointers on > getting the fastest query time possible given these meager resources. Thank > you. > _______________________________________________ > riak-users mailing list > [email protected] > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > _______________________________________________ > riak-users mailing list > [email protected] > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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