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 17284D6B1 for ; Thu, 21 Feb 2013 23:57:04 +0000 (UTC) Received: (qmail 59717 invoked by uid 500); 21 Feb 2013 23:57:01 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 59691 invoked by uid 500); 21 Feb 2013 23:57:01 -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 59682 invoked by uid 99); 21 Feb 2013 23:57:01 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 21 Feb 2013 23:57:01 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,MIME_QP_LONG_LINE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of ptgoetz@gmail.com designates 209.85.128.170 as permitted sender) Received: from [209.85.128.170] (HELO mail-ve0-f170.google.com) (209.85.128.170) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 21 Feb 2013 23:56:54 +0000 Received: by mail-ve0-f170.google.com with SMTP id 14so86878vea.29 for ; Thu, 21 Feb 2013 15:56:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:references:mime-version:in-reply-to:content-type :content-transfer-encoding:message-id:cc:x-mailer:from:subject:date :to; bh=23khe4lOX/h+QzrVE2qwea7YIXbvJnCD7UWigO0V9hs=; b=gBonmtm2wmhf0LHGYa/UOcVDy+OETUmieArO6aiDvKaqjHOG7bxpMGihIKWo6Vbfe/ z37QpoGGZqBWU0hFB4tQojT/JxhZj8t7fgAojGdSZgKta3oEGWiAg/F5bFckHwdpGRRO nLNBQkyR4vcTeXGeNVDkNVdBi1BhZS0xshX9dU2NioD2f4cowyRCb/4L+IK1xS4bd+/D NvqBtKqIymeD/HMB2c1qtSLIJkIkGZIUklBqCDwJj2NDUthailA8wfK+2wPoIXBhZDPo MXCzsPjXIyuxsXnWjMAM6R12/ezjlEOVtr+FI6mMhrhBxeUHcVPUhR/ZLLMHs8mTJY3s 14Hw== X-Received: by 10.220.228.74 with SMTP id jd10mr33349569vcb.65.1361490993076; Thu, 21 Feb 2013 15:56:33 -0800 (PST) Received: from [192.168.1.104] (pool-98-114-37-167.phlapa.fios.verizon.net. [98.114.37.167]) by mx.google.com with ESMTPS id cl9sm693325vdb.3.2013.02.21.15.56.31 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 21 Feb 2013 15:56:31 -0800 (PST) References: <57C7C3CBDCB04F45A57AEC4CB21C0CCD1DB3537C@mbx024-e1-nj-6.exch024.domain.local> <57C7C3CBDCB04F45A57AEC4CB21C0CCD1DB353A3@mbx024-e1-nj-6.exch024.domain.local> Mime-Version: 1.0 (1.0) In-Reply-To: <57C7C3CBDCB04F45A57AEC4CB21C0CCD1DB353A3@mbx024-e1-nj-6.exch024.domain.local> Content-Type: multipart/alternative; boundary=Apple-Mail-F5860946-AD6D-42D8-B168-159876EC06A3 Content-Transfer-Encoding: 7bit Message-Id: <2CDAAEB1-4576-4A40-A018-CECA68DABE36@gmail.com> Cc: "user@cassandra.apache.org" X-Mailer: iPhone Mail (10B146) From: "P. Taylor Goetz" Subject: Re: Cassandra with SAN Date: Thu, 21 Feb 2013 18:56:29 -0500 To: "user@cassandra.apache.org" X-Virus-Checked: Checked by ClamAV on apache.org --Apple-Mail-F5860946-AD6D-42D8-B168-159876EC06A3 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cassandra is designed to write and read data in a way that is optimized for p= hysical spinning disks. Running C* on a SAN introduces a layer of abstraction that, at best negates t= hose optimizations, and at worst introduces additional overhead. Sent from my iPhone On Feb 21, 2013, at 6:42 PM, Kanwar Sangha wrote: > Ok. What would be the drawbacks J > =20 > From: Michael Kjellman [mailto:mkjellman@barracuda.com]=20 > Sent: 21 February 2013 17:12 > To: user@cassandra.apache.org > Subject: Re: Cassandra with SAN > =20 > No, this is a really really bad idea and C* was not designed for this, in f= act, it was designed so you don't need to have a large expensive SAN. > =20 > Don't be tempted by the shiny expensive SAN. :) > =20 > If money is no object instead throw SSD's in your nodes and run 10G betwee= n racks > =20 > From: Kanwar Sangha > Reply-To: "user@cassandra.apache.org" > Date: Thursday, February 21, 2013 2:56 PM > To: "user@cassandra.apache.org" > Subject: Cassandra with SAN > =20 > Hi =E2=80=93 Is it a good idea to use Cassandra with SAN ? Say a SAN whic= h provides me 8 Petabytes of storage. Would I not be I/O bound irrespective o= f the no of Cassandra machines and scaling by adding > machines won=E2=80=99t help ? > =20 > Thanks > Kanwar > =20 > ----------------------------------=20 > Copy, by Barracuda, helps you store, protect, and share all your amazing t= hings. Start today: www.copy.com. > =C2=AD=C2=AD =20 --Apple-Mail-F5860946-AD6D-42D8-B168-159876EC06A3 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Cassandra is designed to write and rea= d data in a way that is optimized for physical spinning disks.
Running C* on a SAN introduces a layer of abstraction that, at b= est negates those optimizations, and at worst introduces additional overhead= .

Sent from my iPhone

On Feb 21, 2013, at 6:42 P= M, Kanwar Sangha <kanwar@mavenir.co= m> wrote:

=

Ok. What would be the d= rawbacks J

 

From: Michael Kje= llman [mailto:mkjellman@barracuda= .com]
Sent: 21 February 2013 17:12
To: user@cassandra.apach= e.org
Subject: Re: Cassandra with SAN

 

No, this= is a really really bad idea and C* was not designed for this, in fact, it w= as designed so you don't need to have a large expensive SAN.

&nb= sp;

Don't be= tempted by the shiny expensive SAN. :)

&nb= sp;

If money= is no object instead throw SSD's in your nodes and run 10G between racks

&nb= sp;

From: Kanwar Sangha <kanwar@mavenir.com>
Reply-To: "user@cassandr= a.apache.org" <user@cass= andra.apache.org>
Date: Thursday, February 21, 2013 2:56 PM
To: "user@cassandra.apac= he.org" <user@cassandra.= apache.org>
Subject: Cassandra with SAN

&nb= sp;

Hi =E2=80=93= Is it a good idea to use Cassandra with SAN ?  Say a SAN which provide= s me 8 Petabytes of storage. Would I not be I/O bound irrespective of the no= of Cassandra machines and scaling by adding

machines w= on=E2=80=99t help ?

=

 

Thanks

Kanwar

&nb= sp;

--------= --------------------------
Copy, by Barracuda, helps you store, protect, and share all your amazing thi= ngs. Start today: www.copy.com. <= /span>

 &n= bsp;=C2=AD=C2=AD  

= --Apple-Mail-F5860946-AD6D-42D8-B168-159876EC06A3--