In 2.6 kernels, NFS clients default to mounting via TCP. Switch to UDP using the 'udp' mount option and you'll be able to switch around your HANFS share with only a few seconds of stalled access. If you do keep it as the TCP, NFS clients will keep the connection in a TIME_WAIT state for quite some time (up to 20 minutes) Thanks, Chris * Alain Moulle <Alain.Moulle@xxxxxxxx> [2007-11-28 11:22:59 +0100]: > Hi > > We are currently trying to set up a HA NFS Sever (CS4u4, active/active). As > decribed in Cookbook we use "managed nfs service" fonctionnality with ext3 FS > type. During failover process (relocate command) we have the following problem : > On server side everything seems to be OK (exports, IP, mount points), but on > the client side time before ressource is back may last from 3 and 20 min > (apparently stalled in "rpc_execute"). Are they any specifics options to use in > that case (NFS,ext3)?, or a well-known issue on that kernel ? > > cluster.conf > <resources> > <fs device="/dev/sdd" force_unmount="1" fstype="ext3" > mountpoint="/tstha" name="nfsha" options=""/> > <nfsexport name="nfsexport1"/> > <nfsclient name="nfsclient1" target="182.20.10.68" > options="rw,no_root_squash,fsid=7"/> > <fs device="/dev/sde" force_unmount="1" fstype="ext3" > mountpoint="/tstha1" name="nfsha1" options=""/> > <nfsexport name="nfsexport2"/> > <nfsclient name="nfsclient2" target="182.20.10.68" > options="rw,no_root_squash,fsid=8"/> > </resources> > <service domain="NFSHA1" name="nfs_service1" autostart="1" > checkinterval="60"> > <ip address="182.20.10.76" monitor_link="1"/> > <fs ref="nfsha"> > <nfsexport name="nfsha"> > <nfsclient ref="nfsclient1"/> > </nfsexport> > </fs> > </service> > <service domain="NFSHA2" name="nfs_service2" autostart="1" > checkinterval="60"> > <ip address="182.20.10.77" monitor_link="1"/> > <fs ref="nfsha1"> > <nfsexport name="nfsha1"> > <nfsclient ref="nfsclient2"/> > </nfsexport> > </fs> > </service> > > on the client side: > > [root@xena8 ~]# ps -ef |grep df > root 85 10 0 Nov27 ? 00:00:00 [pdflush] > root 86 10 0 Nov27 ? 00:00:00 [pdflush] > root 3723 1 0 Nov27 ? 00:00:00 xinetd -stayalive -pidfile > /var/run/xinetd.pid > root 31614 31262 0 10:55 pts/4 00:00:00 df > root 31648 28448 0 10:56 pts/2 00:00:00 grep df > [root@xena8 ~]# cat /proc/31614/wchan > __rpc_execute[root@xena8 ~]# umount /tstha > umount: /tstha: device is busy > umount: /tstha: device is busy > > Thanks for help. > Regards > Alain Moullé > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
