cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Steve Robenalt <sroben...@highwire.org>
Subject Re: Question about EC2 and SSDs
Date Fri, 05 Sep 2014 00:44:57 GMT
Thanks Robert! I am assuming that you meant that it's possible with a
single SSD, right?


On Thu, Sep 4, 2014 at 5:42 PM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Thu, Sep 4, 2014 at 5:05 PM, Steve Robenalt <srobenalt@highwire.org>
> wrote:
>
>> We are migrating a small cluster on AWS from instances based on spinning
>> disks (using instance store) to SSD-backed instances and we're trying to
>> pick the proper instance type. Some of the recommendations for spinning
>> disks say to use different drives for log vs data partitions to avoid
>> issues with seek delays and contention for the disk heads. Since SSDs don't
>> have the same seek delays, is it still recommended to use 2 SSD drives? Or
>> is one sufficient?
>>
>
> The purpose of distinct mount points for commitlog and data is to allow
> the commitlog to operate in an append only manner without seeking. This is
> possible with SSD disk.
>
> =Rob
>

Mime
View raw message