On Thu, 27 Apr 2017 at 13:02 Lloyd R. Prentice <ll...@writersglen.com> wrote:
> Hello, > > I'd like to build a five-node low-cost, low-power Riak KV cluster. Use > case: learning Riak, development, testing, storage of personal data. > > -- Based on pure hand-waving, I've plugged numbers that seem more than > adequate for my purposes into the Riak Cluster Capacity Planning > Calculator. Here's the recommendation: > > To manage your estimated 100.0 thousand key/bucket pairs where bucket > names are ~10 bytes, keys are ~36 bytes, values are ~97.7 KiB and you are > setting aside 2.0 GiB of RAM per-node for in-memory data management within > a cluster that is configured to maintain 3 replicas per key (N = 3) then > Riak, using the Bitcask storage engine, will require at least: > > 5 nodes > 6.4 MiB of RAM per node (31.9 MiB total across all nodes) > 5.6 GiB of storage space per node (28.0 GiB total storage space used > across all nodes) > Based on this, I'm considering the following hardware: > > 5 ODROID XU-4 > http://www.hardkernel.com/main/products/prdt_info.php?g_code=G143452239825 > > Each with 8 Gb eMMC storage > > This provides a 64-bit 2 GHz processor and 2 Gb RAM per day node running > Ubuntu 16.04 at total cost of something under total $65000 for the cluster. > > Does this sound like a feasible way to go? Any downsides? > I'm not sure where you get the $65000 total figure, but that sounds extremely high!! Unless you're talking Vietnamese Dong currency or something. Either way, why not consider running 5x Amazon AWS EC2 nodes? Or run up a bunch of virtual machines on your own PC? I think both of those will give you more realistic Riak results than using a bunch of ARM bigLITTLE machines which are pretty different to your typical Linux servers. Toby
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