Return-Path: Delivered-To: apmail-hadoop-common-user-archive@www.apache.org Received: (qmail 44635 invoked from network); 3 Jan 2010 03:22:54 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 3 Jan 2010 03:22:54 -0000 Received: (qmail 36388 invoked by uid 500); 3 Jan 2010 03:22:52 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 36255 invoked by uid 500); 3 Jan 2010 03:22:51 -0000 Mailing-List: contact common-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-user@hadoop.apache.org Delivered-To: mailing list common-user@hadoop.apache.org Received: (qmail 36245 invoked by uid 99); 3 Jan 2010 03:22:51 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 03 Jan 2010 03:22:51 +0000 X-ASF-Spam-Status: No, hits=3.3 required=10.0 tests=DNS_FROM_RFC_BOGUSMX,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [62.179.121.35] (HELO viefep15-int.chello.at) (62.179.121.35) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 03 Jan 2010 03:22:41 +0000 Received: from edge01.upc.biz ([192.168.13.236]) by viefep15-int.chello.at (InterMail vM.7.09.01.00 201-2219-108-20080618) with ESMTP id <20100103032220.SABV18259.viefep15-int.chello.at@edge01.upc.biz> for ; Sun, 3 Jan 2010 04:22:20 +0100 Received: from yacc.selfip.org ([84.113.129.132]) by edge01.upc.biz with edge id QrNH1d09w2rY11801rNKJq; Sun, 03 Jan 2010 04:22:20 +0100 X-SourceIP: 84.113.129.132 Received: from andidesk.lan (localhost [127.0.0.1]) by yacc.selfip.org (Postfix) with ESMTP id 7E60F40BED for ; Sun, 3 Jan 2010 04:21:23 +0100 (CET) Subject: Re: HDFS read/write speeds, and read optimization From: Andreas Kostyrka To: common-user@hadoop.apache.org Cc: core-user@hadoop.apache.org In-Reply-To: <77938bc21001021454k347c76a7o9c59589b8ea386e@mail.gmail.com> References: <77938bc20904091545x623893f6jef73eaa4cac429f0@mail.gmail.com> <77938bc20904100740r37c25a0dwa7f473ac90f62593@mail.gmail.com> <1038C178-357B-4A3F-90F6-9D0F509733E3@cse.unl.edu> <77938bc20904101151r23f10826ie1559e6fe9192d7@mail.gmail.com> <49DFBAE5.201@yahoo-inc.com> <77938bc20912281101w11e3cd04r9d5db31784df68c8@mail.gmail.com> <77938bc21001021454k347c76a7o9c59589b8ea386e@mail.gmail.com> Content-Type: text/plain; charset="UTF-8" Date: Sun, 03 Jan 2010 04:21:19 +0100 Message-ID: <1262488879.9296.1051.camel@andidesk.lan> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit X-Virus-Checked: Checked by ClamAV on apache.org Well, that all depends on many details, but: -) are you really using 4 discs (configured correctly as data directories?) -) What hdd/connection technology? -) And 77MB/s would match up curiously well with 1Gbit networking cards? So you sure that you are testing a completely local setup? Where's your name node running then? Andreas Am Sonntag, den 03.01.2010, 00:54 +0200 schrieb Stas Oskin: > Hi. > > Can anyone advice on the subject below? > > Thanks! > > On Mon, Dec 28, 2009 at 9:01 PM, Stas Oskin wrote: > > > Hi. > > > > Going back to the subject, has anyone ever bench-marked small (10 - 20 > > node) HDFS clusters? > > > > I did my own speed checks, and it seems I can reach ~77Mbps, on a quad-disk > > node. This comes to ~19Mbps per disk, which seems quite low in my opinion. > > > > Can anyone advice about this? > > > > Thanks. > >