In AWS you have an option in a VPC to get dedicated gear. In a local DC, your VMware admin should be able to set up rules to make sure that groups of VMs only land on the same host in the event of a catastrophic multi-host failure.
You'll have difficulties getting predictable performance while sharing VM hosts. -- Jeremiah Peschka - Founder, Brent Ozar Unlimited MCITP: SQL Server 2008, MVP Cloudera Certified Developer for Apache Hadoop On Feb 21, 2013, at 6:54 PM, Alexander Sicular <[email protected]> wrote: > 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 > > _______________________________________________ > riak-users mailing list > [email protected] > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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