Thanks Aaron. Thanks
Jabbar Azam On 14 April 2013 19:39, aaron morton <aa...@thelastpickle.com> wrote: > That's better. > > The SSD size is a bit small, and be warned that you will want to leave > 50Gb to 100GB free to allow room for compaction (using the default size > tiered). > > On the ram side you will want to run about 4GB (assuming cass 1.2) for the > JVM the rest can be off heap Cassandra structures. This may not leave too > much free space for the os page cache, but SSD may help there. > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 13/04/2013, at 4:47 PM, Jabbar Azam <aja...@gmail.com> wrote: > > What about using quad core athlon x4 740 3.2 GHz with 8gb of ram and 256gb > ssds? > > I know it will depend on our workload but will be better than a dual core > CPU. I think.... > > Jabbar Azam > On 13 Apr 2013 01:05, "Edward Capriolo" <edlinuxg...@gmail.com> wrote: > >> Duel core not the greatest you might run into GC issues before you run >> out of IO from your ssd devices. Also cassandra has other concurrency >> settings that are tuned roughly around the number of processors/cores. It >> is not uncommon to see 4-6 cores of cpu (600 % in top dealing with young >> gen garbage managing lots of sockets whatever. >> >> >> On Fri, Apr 12, 2013 at 12:02 PM, Jabbar Azam <aja...@gmail.com> wrote: >> >>> That's my guess. My colleague is still looking at CPU's so I'm hoping he >>> can get quad core CPU's for the servers. >>> >>> Thanks >>> >>> Jabbar Azam >>> >>> >>> On 12 April 2013 16:48, Colin Blower <cblo...@barracuda.com> wrote: >>> >>>> If you have not seen it already, checkout the Netflix blog post on >>>> their performance testing of AWS SSD instances. >>>> >>>> >>>> http://techblog.netflix.com/2012/07/benchmarking-high-performance-io-with.html >>>> >>>> My guess, based on very little experience, is that you will be CPU >>>> bound. >>>> >>>> >>>> On 04/12/2013 03:05 AM, Jabbar Azam wrote: >>>> >>>> Hello, >>>> >>>> I'm going to be building a 20 node cassandra cluster in one >>>> datacentre. The spec of the servers will roughly be dual core Celeron CPU, >>>> 256 GB SSD, 16GB RAM and two nics. >>>> >>>> >>>> Has anybody done any performance testing with this setup or have any >>>> gotcha's I should be aware of wrt to the hardware? >>>> >>>> I do realise the CPU is fairly low computational power but I'm going >>>> to assume the system is going to be IO bound hence the RAM and SSD's. >>>> >>>> >>>> Thanks >>>> >>>> Jabbar Azam >>>> >>>> >>>> >>>> -- >>>> *Colin Blower* >>>> *Software Engineer* >>>> Barracuda Networks Inc. >>>> +1 408-342-5576 (o) >>>> >>> >>> >> >
