From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ausc60ps301.us.dell.com ([143.166.148.206]:53445 "EHLO ausc60ps301.us.dell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932763Ab1ERLyy convert rfc822-to-8bit (ORCPT ); Wed, 18 May 2011 07:54:54 -0400 From: To: Date: Wed, 18 May 2011 17:24:45 +0530 Subject: Performance Issue with multiple dataserver Message-ID: References: <4DD2A084.1040905@moving-picture.com> <20110518080106.1159c5b8@notabene.brown> <4DD39D39.7010805@moving-picture.com> In-Reply-To: <4DD39D39.7010805@moving-picture.com> Content-Type: text/plain; charset="us-ascii" Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Hi, I have done pNFS setup with single Dataserver and Two Dataserver and ran the IOzone tool on both, I found that the performance with multiple dataservers is less than the performance with single dataservers. Here are some numbers, which were captured by the IOzone tool. 4 8 16 32 64 128 256 512 1024 <== Record Length in KB With Single Dataserver: Read operation for file size 1 MB- 66415 66359 63630 70358 86223 70256 66047 66068 68489 <== IO kB/sec Write operation for file size 1 MB- 18827 16920 18846 17039 18896 17009 17173 19206 17947 <== IO kB/sec With Two Dataservers : Read operation for file size 1 MB- 36882 381198 38150 38084 38749 33663 34398 37313 37847 <== IO kB/sec Write operation for file size 1 MB- 5461 4661 5586 4870 5227 4922 4214 5572 4658 <== IO kB/sec Can somebody tell me What could be the issue....