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From Darvin Denmian <darvin.denm...@gmail.com>
Subject Re: Use of SSD for commitlog
Date Wed, 08 Aug 2012 15:18:15 GMT
Great !

On Wed, Aug 8, 2012 at 11:41 AM, Amit Kumar <kumaramit.extra@gmail.com>wrote:

>
> There is a really good presentation about SSD and Cassandra on youtube by
> Rick Branson. I highly recommend watching it.
>
> http://www.youtube.com/watch?v=zQdDi9pdf3I
>
>
> Amit
> On Aug 8, 2012, at 6:23 AM, Hiller, Dean wrote:
>
> > A 7.5 is probably fine and can still beat it as it is going to be the
> speed of writing not seeking(and I am not sure if they spec hard drives
> with a write time when not seeking….not sure).  Remember that drives are
> rated on how fast they spin…this disk should not be spinning a lot(in
> theory)…it is always writing.
> >
> > Even on a read, it would do one seek and then do a very long sequential
> read(and I think that only happens on startup anyways).
> >
> > Later,
> > Dean
> >
> > From: Darvin Denmian <darvin.denmian@gmail.com<mailto:
> darvin.denmian@gmail.com>>
> > Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
> <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
> > Date: Wednesday, August 8, 2012 7:16 AM
> > To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <
> user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
> > Subject: Re: Use of SSD for commitlog
> >
> > Thanks for your reply Dean,
> >
> > considering your reply.... maybe I use a 15k RPM SCSI Disk, I think
> it'll perform better than a SSD disk.
> >
> > On Wed, Aug 8, 2012 at 10:01 AM, Hiller, Dean <Dean.Hiller@nrel.gov
> <mailto:Dean.Hiller@nrel.gov>> wrote:
> > Probably not since it is sequential writes….(ie. Seek performance is the
> big hit and if it is sequential it should not be seeking and is about just
> as fast as an SSD in theory).  In practice, I have not measure the
> performance of one vs. the other though…that I always the best way to
> go.(you could write a micro benchmark test with warmup writes and then
> stream writes to and see how it does without cassandra).
> >
> > Dean
> >
> > From: Darvin Denmian <darvin.denmian@gmail.com<mailto:
> darvin.denmian@gmail.com><mailto:darvin.denmian@gmail.com<mailto:
> darvin.denmian@gmail.com>>>
> > Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org
> ><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>"
<
> user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:
> user@cassandra.apache.org<mailto:user@cassandra.apache.org>>>
> > Date: Tuesday, August 7, 2012 8:34 PM
> > To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:
> user@cassandra.apache.org<mailto:user@cassandra.apache.org>>" <
> user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:
> user@cassandra.apache.org<mailto:user@cassandra.apache.org>>>
> > Subject: Use of SSD for commitlog
> >
> > Hi,
> >
> > Can somebody tell me if is there some benefit in use SSD Disks
> > for commitlog?
> >
> > THanks!
> >
>
>

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