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From Andrey Ilinykh <>
Subject Re: Recomended storage choice for Cassandra on Amazon m1.xlarge instance
Date Tue, 03 Sep 2013 16:25:34 GMT
You benefit from putting commit log on separate drive only if this drive is
an isolated spinning device. EC2 ephemeral is a virtual device, so I don't
think it makes sense to put commit log on a separated drive. I would build
raid0 from 4 drives and put everything their. But it would be interesting
to compare different configurations.

Thank you,

On Mon, Sep 2, 2013 at 7:11 PM, Renat Gilfanov <> wrote:

> Hello,
> I'd like to ask what is the best options of separating commit log and data
> on Amazon m1.xlarge instance, given 4x420 Gb attached storages and EBS
> volume ?
> As far as I understand, the EBS is not the choice and it's recomended to
> use attached storages instead.
> Is it better to combine 4 ephemeral drives in 2 raid0 (or raid1 ?), and
> store data on the first and commit log on the second? Or may be trying
> other combinations like 1 attached storage for commit log, and 3 others
> grouped in raid0 for data?
> Thank you.

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