Hi Basho people, I need to get some info about user Riak on VM's .
We intend to use Riak as the backed for a user session store . We have tested on EC2 and determined the following : Using a cluster of 5 x EC2's m1.xlarge instances. (4 cores, 15GB memory). w /256 partitions w/ Bitcask : At 100K RPM. CPU utilization is at 200%. At 300K RPM, 300%. median time is still acceptable, but we see some requeststaking 20ms. Since it's a small dataset, and responsiveness is important here, I think we should keep our entire working set in memory. 4GB per node allows us to do that for up to 10 million keys. In reality , in production , we would peak at 1 million keys. Our tests on VM's (EC2) have been quite successful . However I'm concerned about the IO cost of using VM's in production . "Riak is already virtualized, so let it handle that instead of running it on yet another virtualisation" I know there are no hard and fast answers here , but I'm wondering if anyone had any strong points of view. Thanks, John
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