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From Andrey Ilinykh <ailin...@gmail.com>
Subject Re: Commit log and data separation on SSD
Date Mon, 23 Sep 2013 18:58:38 GMT
Actually, many SSD drives show much better performance for sequential write
then random writes, so you may benefit from a separate drive  for commit
logs.


On Mon, Sep 23, 2013 at 11:21 AM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Sun, Sep 22, 2013 at 4:02 PM, Shahryar Sedghi <shsedghi@gmail.com>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.
>
> =Rob
>

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