I already have thanks. I'll do the tests with the hardware arrives.
Thanks
Jabbar Azam
On 16 April 2013 22:27, aaron morton wrote:
> Can't we use LCS?
>
> Do some reading and some tests…
>
> http://www.datastax.com/dev/blog/leveled-compaction-in-apache-cassandra
> http://www.datastax.com/dev/
> Can't we use LCS?
Do some reading and some tests…
http://www.datastax.com/dev/blog/leveled-compaction-in-apache-cassandra
http://www.datastax.com/dev/blog/when-to-use-leveled-compaction
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.t
I know the SSD's are a bit small but they should be enough for our
application. Out test data is 1.6 TB(including replication of rf=3). Can't
we use LCS? This will give us more space at the expensive of more I/O but
SSD's have loads of I/Os.
Thanks
Jabbar Azam
On 14 April 2013 20:20, Jabbar
Thanks Aaron.
Thanks
Jabbar Azam
On 14 April 2013 19:39, aaron morton 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 ru
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.
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" wrote:
> Duel core not the greatest you might run into GC issues before
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
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 wrote:
> If you have not seen it already, checkout the Netflix blog post on their
> performance testing of AWS SSD instanc
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, Jabb
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?
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