Thank you very much you both Jonathan and Peter. I will upgrade.
However, the point has to do with the fact Peter mentions. With smaller memtables I see that minor compaction is unable to keep up with the writes. The number of sstables grows constantly during my peaks hours. With 400MB memtables the cluster is always compacting and the number of sstables grows constantly. I don't see the cluster is io bounded even with compaction (disk utilization is bellow 60% during compactions) but I think that a large number of sstables affects my reads latency. Now I have 5-7 sstables during the peak hours and when I tried with smaller sstables I saw a 30 sstables (and then I got scared and rollbacked the change) Carlos.
