Hi Jean-Armel, Nikolai, 1. Increasing sstable size doesn't work (well, I think, unless we "overscale" - add more nodes than really necessary, which is prohibitive for us in a way). Essentially there is no change. I gave up and will go for STCS;-( 2. We use 2.0.11 as of now 3. We are running on EC2 c3.8xlarge instances with EBS volumes for data (GP SSD)
Jean-Armel, I believe that what you say about many small instances is absolutely true. But, is not good in our case - we write a lot and almost never read what we've written. That is, we want to be able to read everything, but in reality we hardly read 1%, I think. This implies that smaller instances are of no use in terms of read performance for us. And generally nstances/cpu/ram is more expensive than storage. So, we really would like to have instances with large storage. Andrei. On Tue, Nov 25, 2014 at 11:23 AM, Jean-Armel Luce <jaluc...@gmail.com> wrote: > Hi Andrei, Hi Nicolai, > > Which version of C* are you using ? > > There are some recommendations about the max storage per node : > http://www.datastax.com/dev/blog/performance-improvements-in-cassandra-1-2 > > "For 1.0 we recommend 300-500GB. For 1.2 we are looking to be able to handle > 10x > (3-5TB)". > > I have the feeling that those recommendations are sensitive according many > criteria such as : > - your hardware > - the compaction strategy > - ... > > It looks that LCS lower those limitations. > > Increasing the size of sstables might help if you have enough CPU and you > can put more load on your I/O system (@Andrei, I am interested by the > results of your experimentation about large sstable files) > > From my point of view, there are some usage patterns where it is better to > have many small servers than a few large servers. Probably, it is better to > have many small servers if you need LCS for large tables. > > Just my 2 cents. > > Jean-Armel > > 2014-11-24 19:56 GMT+01:00 Robert Coli <rc...@eventbrite.com>: >> >> On Mon, Nov 24, 2014 at 6:48 AM, Nikolai Grigoriev <ngrigor...@gmail.com> >> wrote: >>> >>> One of the obvious recommendations I have received was to run more than >>> one instance of C* per host. Makes sense - it will reduce the amount of data >>> per node and will make better use of the resources. >> >> >> This is usually a Bad Idea to do in production. >> >> =Rob >> > >
