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From Ali Akhtar <>
Subject Re: Cassandra cluster Too high DISK IOs
Date Fri, 20 Mar 2015 18:05:31 GMT
That probably depends on how many read / write queries your cluster is

Also, since you mentioned provisoned IOPS, are you using EBS for storing
the data? If so, you probably want to switch to the ephemeral storage since
its locally attached to the instance and doesn't require a network call for
each lookup.

On Fri, Mar 20, 2015 at 10:57 PM, Pranay Agarwal <>

> Hi All.
> I am using 15 nodes cassandra cluster(m3.2xlarge) with provisioned IOPS
> disks (4000). I can see around 12k reads/sec ops on the cassandra cluster.
> But I see around *~3500 read IOPS* on each of the cassandra nodes. Is
> that normal?
> I am using LevelledCompaction and I can see in the histograms that most
> read requests are coming from 1/2 sstables only. Why are there so many disk
> IOPS or is the normal for cassandra?
> -Pranay

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