From: "Henrik Schmiediche" Subject: RE: Extremely high load on NFS clients wen the NFS server is down... Date: Wed, 18 May 2005 14:11:58 -0500 Message-ID: <200505181912.j4IJCS8v011808@s7.stat.tamu.edu> References: <428B82EA.7050509@RedHat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list2.sourceforge.net with esmtp (Exim 4.30) id 1DYTy5-0002Pq-M5 for nfs@lists.sourceforge.net; Wed, 18 May 2005 12:12:33 -0700 Received: from s7.stat.tamu.edu ([165.91.117.61]) by sc8-sf-mx2.sourceforge.net with esmtp (TLSv1:AES256-SHA:256) (Exim 4.41) id 1DYTy4-0000WR-3D for nfs@lists.sourceforge.net; Wed, 18 May 2005 12:12:33 -0700 To: "'Steve Dickson'" In-Reply-To: <428B82EA.7050509@RedHat.com> Sender: nfs-admin@lists.sourceforge.net Errors-To: nfs-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Post: List-Help: List-Subscribe: , List-Archive: Steve, Thanks for your response. The command 'echo t > /proc/sysrq-trigger' does nothing that I can tell. Is there something I need to do to enable this feature? Completely useless means that the load continues to increase on the server that has the NFS file systems mounted to the point it become sluggish and ultimately stops responding altogether. As the load increases the system (at the beginning) is still responsive so I can monitor it. 'top' suggests there is no process eating up a significant amount of CPU as the load is increasing. I do not know if the load ever plateaus, the system stops responding before that point. The kernel is 2.6.11.4-20a-smp --- the latest one as far as I know. There is a lot of network traffic on the server. I will get an ethereal dump when I can. Sincerely, - Henrik -----Original Message----- From: nfs-admin@lists.sourceforge.net [mailto:nfs-admin@lists.sourceforge.net] On Behalf Of Steve Dickson Sent: Wednesday, May 18, 2005 1:01 PM To: Henrik Schmiediche Cc: nfs@lists.sourceforge.net Subject: Re: [NFS] Extremely high load on NFS clients wen the NFS server is down... Henrik Schmiediche wrote: > I have two Redhat AS3 servers. One of them (among other things) serves NFS > file systems to my other systems including to the other server. When my NFS > file server goes down or is restarted the load on the other AS3 server > increases to the point it is completely useless (it goes to 50+ in a minute > or two). I never observed this behavior when I was serving NFS file systems > using a Solaris system. > > Has anyone observed this phenomenon? Any solution to it? No... Please define "completely useless". Is there a ton of network traffic? If so, please produce a bzip2 binary tethereal trace of the traffic. If the cpu is pined or the system hangs please produce a system trace (i.e. echo t > /proc/sysrq-trigger). Also what is the exact kernel version (i.e. uname -r). steved. ------------------------------------------------------- This SF.Net email is sponsored by Oracle Space Sweepstakes Want to be the first software developer in space? Enter now for the Oracle Space Sweepstakes! http://ads.osdn.com/?ad_id=7412&alloc_id=16344&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ------------------------------------------------------- This SF.Net email is sponsored by Oracle Space Sweepstakes Want to be the first software developer in space? Enter now for the Oracle Space Sweepstakes! http://ads.osdn.com/?ad_id=7412&alloc_id=16344&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs