From: =?iso-8859-1?q?Jos=E9=20Vicente=20N=FA=F1ez=20Zuleta?= Subject: NFS problems: help needed Date: Wed, 24 Apr 2002 16:31:16 -0500 (CDT) Sender: nfs-admin@lists.sourceforge.net Message-ID: <20020424213116.77967.qmail@web10002.mail.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Return-path: Received: from web10002.mail.yahoo.com ([216.136.130.38]) by usw-sf-list1.sourceforge.net with smtp (Exim 3.31-VA-mm2 #1 (Debian)) id 170UM9-0004Tv-00 for ; Wed, 24 Apr 2002 14:31:17 -0700 To: nfs@lists.sourceforge.net Errors-To: nfs-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Unsubscribe: , List-Archive: Greetings, I'm having serious problems with my NFS environment; The server is a Dual Pentium III 1Ghz running Redhat 7.2 (Kernel 2.4.7-10smp) and the clients are Dual Pentium 1Ghz Redhat 6.2 (Kernel 2.2.14-5.0smp). We have a process that opens a lot of files on all the cluster and after some seconds, all the clients start showing the following messages: Apr 23 19:12:05 linux0102 kernel: nfs: server lnxdev0003 OK Apr 23 19:12:17 linux0102 kernel: nfs: task 1059 can't get a request slot Apr 23 19:12:33 linux0102 kernel: nfs: server lnxdev0003 OK Apr 23 19:12:44 linux0102 kernel: nfs: server lnxdev0003 not responding, still trying Apr 23 19:12:44 linux0102 kernel: nfs: server lnxdev0003 OK Apr 23 19:12:54 linux0102 kernel: nfs: server lnxdev0003 not responding, still trying Apr 23 19:14:45 linux0102 automount[895]: expired /nb_apps/espiel Apr 23 19:14:45 linux0102 automount[895]: expired /nb_apps/expat Apr 23 19:14:45 linux0102 automount[895]: expired /nb_apps/crypto Apr 23 19:14:45 linux0102 automount[895]: expired /nb_apps/rogue Apr 23 19:14:45 linux0102 automount[895]: expired /nb_apps/ACE Apr 23 19:14:45 linux0102 automount[895]: expired /nb_apps/xerces Apr 23 19:15:49 linux0102 automount[906]: expired /home/suresh Apr 23 19:16:06 linux0102 kernel: nfs: server lnxdev0003 OK Apr 23 19:16:06 linux0102 kernel: nfs: server lnxdev0003 OK Apr 23 19:16:38 linux0102 kernel: nfs: server lnxdev0003 not responding, still trying I followed the tutorial that appears at "http://nfs.sourceforge.net/nfs-howto/performance.html" and applied the following optimizations (with no result): - Deactivated auto-negotiation on the HUB (we have a Cisco FastHub 400) and forced the NIC to use "Full Duplex" using FastEthernet. This should reduce the number of collissions. - Increased the number of nfsd servers and the socket queue (here is a fragment of my script, /etc/init.d/nfs, currently i use 16 nfsd servers): RPCNFSDCOUNT=16 .... # NFSv3 only if kernel >= 2.2.18 OS_RELEASE=`uname --release` .... echo -n "Starting NFS mountd: " daemon rpc.mountd $RPCMOUNTDOPTS echo echo -n "Starting NFS daemon: " echo 262144 > /proc/sys/net/core/rmem_default echo 262144 > /proc/sys/net/core/rmem_max daemon rpc.nfsd $RPCNFSDCOUNT echo 65536 > /proc/sys/net/core/rmem_default echo 65536 > /proc/sys/net/core/rmem_max echo - I increased the rsize and wsize on my clients to 4096 (im using automount and NIS, /etc/auto.master): /home auto.home -rw,intr,retry=10,rsize=4096,wsize=4096 /nb_apps auto.nb_apps -rw,intr,retry=10,rsize=4096,wsize=4096 /data auto.data -rw,intr,retry=10,rsize=4096,wsize=4096 What i should try next?. We have a network with very few machines, apparently no collissions (the stats at the hub doesn't show that many but i will have to confirm). Should i try to update the nfs-tools on all the boxes ( i can't do the same to the kernel because we have a Cordba lib that could broke, at least on the clients)? The server doesn't have a high load (i'm monitoring the box using top and UCD-SNMP) and other network apps work fine so far :( Thanks in advance. ===== Jos? Vicente Nu?ez Zuleta (josevnz@yahoo.com) Newbreak System Administrator (http://www.newbreak.com) Office Phone: 203-355-1511, 203-355-1510 Fax: 203-355-1512 Cellular Phone: 203-570-7078 _________________________________________________________ Do You Yahoo!? Informaci?n de Estados Unidos y Am?rica Latina, en Yahoo! Noticias. Vis?tanos en http://noticias.espanol.yahoo.com _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs