Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 66839DC04 for ; Wed, 8 Aug 2012 13:17:24 +0000 (UTC) Received: (qmail 14818 invoked by uid 500); 8 Aug 2012 13:17:22 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 14796 invoked by uid 500); 8 Aug 2012 13:17:22 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 14788 invoked by uid 99); 8 Aug 2012 13:17:21 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 08 Aug 2012 13:17:21 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=FSL_RCVD_USER,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of darvin.denmian@gmail.com designates 209.85.212.44 as permitted sender) Received: from [209.85.212.44] (HELO mail-vb0-f44.google.com) (209.85.212.44) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 08 Aug 2012 13:17:16 +0000 Received: by vbbez10 with SMTP id ez10so799979vbb.31 for ; Wed, 08 Aug 2012 06:16:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=YpIbxCNp5xaSL326NTsZg10PQpT2BZEG85kAB8H4z30=; b=gGF07Yx2ThGRPRAySaxX3xQEOvmU8VN1YH+0AKgpfhT7ze4QyOtS5mTcK2YkHLxIk4 7l6r0puIp77wJ1IwzzfelUI6rwCOSkv4t3jYSbHNolJNj2hbH0xZSB6bghuuIiy2R+u5 /x0mbVIs8DrZdtX1bjhwoFvlPxY8Xs0m4Alf9uqN88FJcfOi28EGvJNLrWnP1tgoWgJT 5rx1AcpHmEW4Y5D5kdVH0Y7K86lAc51KNGA39HIIz54VIkMVWmUQ9B7jOv1mExtGEer4 rz2AKUqY1VNMPmph+g35jMFdp4CcOAMMn7IhbSlRvv3vUTO2X5K/jb/biMPDSlXGJOmX 57Kw== Received: by 10.220.7.212 with SMTP id e20mr13783677vce.44.1344431816184; Wed, 08 Aug 2012 06:16:56 -0700 (PDT) MIME-Version: 1.0 Received: by 10.52.155.2 with HTTP; Wed, 8 Aug 2012 06:16:35 -0700 (PDT) In-Reply-To: References: From: Darvin Denmian Date: Wed, 8 Aug 2012 10:16:35 -0300 Message-ID: Subject: Re: Use of SSD for commitlog To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=bcaec54ee850d412c204c6c0eced X-Virus-Checked: Checked by ClamAV on apache.org --bcaec54ee850d412c204c6c0eced Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable 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 wrote: > Probably not since it is sequential writes=85.(ie. Seek performance is th= e > big hit and if it is sequential it should not be seeking and is about jus= t > as fast as an SSD in theory). In practice, I have not measure the > performance of one vs. the other though=85that 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>> > Reply-To: "user@cassandra.apache.org" < > user@cassandra.apache.org> > Date: Tuesday, August 7, 2012 8:34 PM > To: "user@cassandra.apache.org" < > 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! > --bcaec54ee850d412c204c6c0eced Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Thanks for your reply Dean,

considering your reply....= =A0maybe 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> wrote:
Probably not since it is sequential writes= =85.(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). =A0In practi= ce, I have not measure the performance of one vs. the other though=85that I= always the best way to go.(you could write a micro benchmark test with war= mup 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>>
Reply-To: "user@cassandra= .apache.org<mailto:user= @cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Tuesday, August 7, 2012 8:34 PM
To: "user@cassandra.apach= e.org<mailto:user@cassa= ndra.apache.org>" <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!

--bcaec54ee850d412c204c6c0eced--