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From Robert Coli <>
Subject Re: Commit log and data separation on SSD
Date Mon, 23 Sep 2013 18:21:15 GMT
On Sun, Sep 22, 2013 at 4:02 PM, Shahryar Sedghi <> wrote:

> This my first SSD experience. With  normal disks we separate commit log
> from data. We have 2 SSDs dedicated to Cassandra  I was wondering if we
> gain a better performance  if we put commit  log in one and data in
> another, or just use raid 0 to have both SSDs combined.

The primary win from separation comes when your head does not move while
appending. As your SSDs have no heads, you do not get this win.


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