Your latency doesn't seem that high that can cause that problem. I suspect more of a problem with the Cassandra version (2.1.3) than that with the hard drives. I didn't look deep into the information provided but for your reference, the only time I had serious (leading to OOM and all sort of weird behavior) my hard drives where near 70ms latency.
Regards, Carlos Juzarte Rolo Cassandra Consultant Pythian - Love your data rolo@pythian | Twitter: cjrolo | Linkedin: *linkedin.com/in/carlosjuzarterolo <http://linkedin.com/in/carlosjuzarterolo>* Tel: 1649 www.pythian.com On Wed, Feb 25, 2015 at 11:19 AM, Ja Sam <ptrstp...@gmail.com> wrote: > Hi, > I write some question before about my problems with C* cluster. All my > environment is described here: > https://www.mail-archive.com/user@cassandra.apache.org/msg40982.html > To sum up I have thousands SSTables in one DC and much much less in > second. I write only to first DC. > > Anyway after reading a lot of post/mails/google I start to think that the > only reason of above is disk problems. > > My OpsCenter with some stats is following: > https://drive.google.com/file/d/0B4N_AbBPGGwLR21CZk9OV1kxVDA/view > > My iostats are like this: > https://drive.google.com/file/d/0B4N_AbBPGGwLTTZEeG1SYkF0cXc/view > (dm-XX are C* drives. dm-11 is for commitlog) > > If You could be so kind and validate above and give me an answer is my > disk are real problems or not? And give me a tip what should I do with > above cluster? Maybe I have misconfiguration? > > Regards > Piotrek > -- --
