From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from int-mailstore01.merit.edu ([207.75.116.232]:43089 "EHLO int-mailstore01.merit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751072Ab1CKRCb (ORCPT ); Fri, 11 Mar 2011 12:02:31 -0500 Date: Fri, 11 Mar 2011 12:02:27 -0500 From: Jim Rees To: =?utf-8?B?55m95p2+5p6X?= <09120171@bjtu.edu.cn> Cc: bhalevy@panasas.com, linux-nfs@vger.kernel.org Subject: Re: questions about blocklayoutdriver.ko Message-ID: <20110311170227.GA3096@merit.edu> References: Content-Type: text/plain; charset=utf-8 In-Reply-To: Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 白松林 wrote: We tested the pNFS informance in the environment,and found that when client write data to /mnt,all of the data be sent to MDS firstly, and then MDS forwarded the data to DS,when we got the package by wireshark,and found most of the protocol between MDS and DS are NFS and TCP. I suspect you don't actually have a pnfs mount. Check/proc/self/mountstats for pnfs=LAYOUT_BLOCK_VOLUME. I recently added a troubleshooting section to the pnfs block client how-to, maybe that will help. http://wiki.linux-nfs.org/wiki/index.php/Fedora_pNFS_Client_Setup