Hi Dennis,
Have you also added /var/lib/nfs to the shared DRBD resource? This is an important step to ensure that data about currently-open files and mount information is transferred to the other node during failover. See the end of Step 4: http://www.howtoforge.com/highly-available-nfs-server-using-drbd-and-heartbeat-on-debian-5.0-lenny Thanks, Andrew ----- Original Message ----- From: "emmanuel segura" <emi2f...@gmail.com> To: "The Pacemaker cluster resource manager" <pacemaker@oss.clusterlabs.org> Sent: Monday, January 16, 2012 6:06:54 AM Subject: Re: [Pacemaker] how does the exportfs resource agent work? you should check how you mount the nfs cluster share from your client for example mount -o hard,rw,rsize=32768,wsize=32768,suid,proto=tcp,vers=3 -t nfs your_virtual_ip:/your_cluster_fs_share /mountpoint man nfs ===================================================== timeo=n The value in tenths of a second before sending the first retransmission after an RPC timeout. The default value is 7 tenths of a second. After the first timeout, the timeout is doubled after each suc- cessive timeout until a maximum timeout of 60 seconds is reached or the enough retransmissions have occured to cause a major timeout. Then, if the filesystem is hard mounted, each new timeout cascade restarts at twice the initial value of the previous cascade, again doubling at each retransmission. The maximum timeout is always 60 seconds. Better overall performance may be achieved by increasing the timeout when mounting on a busy network, to a slow server, or through several routers or gateways. retrans=n The number of minor timeouts and retransmissions that must occur before a major timeout occurs. The default is 3 timeouts. When a major timeout occurs, the file operation is either aborted or a "server not responding" message is printed on the console. ======================================================= 2012/1/16 Dennis Jacobfeuerborn < denni...@conversis.de > What am I supposed to look for? Regards, Dennis On 01/16/2012 12:13 PM, emmanuel segura wrote: <blockquote> I think man nfs it's can help you Try to look your nfs client options 2012/1/15 Dennis Jacobfeuerborn < denni...@conversis.de <mailto: denni...@conversis.de > > Hi, I'm trying to build a HA nfs system based on drbd and apart from the nfs export everything is working fine. The problem is that when I force a failover things seem to work fine yet when I fail back to the original system the clients freeze for a very long time. /mnt/tmp is the mountpoint on the client and I'm using the following to test access: for i in `seq 1 2000`; do echo $i; ls /mnt/tmp; sleep 1; done on a failover the output look like this: ... 47 testfile testfile2 48 testfile testfile2 49 testfile testfile2 50 testfile testfile2 51 testfile testfile2 52 ls: cannot open directory /mnt/tmp: Permission denied 53 ls: cannot open directory /mnt/tmp: Permission denied 54 <<< freeze of several minutes >>> testfile testfile2 55 testfile testfile2 56 testfile testfile2 ... The first question I have is how can I prevent the "Permission denied" errors? If these occur on e.g. a mountpoint for MySQL for example this will no doubt lead to problems with the database and that means the storage isn't really redundant. The second question is how do I reduce the failover time? I tried adding timeo=30 to the client mount options but that doesn't seem to help. This is what my cib looks like: node storage1.dev node storage2.dev primitive p_drbd_nfs ocf:linbit:drbd \ params drbd_resource="nfs" \ op monitor interval="15" role="Master" \ op monitor interval="30" role="Slave" primitive p_exportfs_data ocf:heartbeat:exportfs \ params fsid="1" directory="/mnt/data/export" options="rw,no_root_squash" clientspec="*" \ op monitor interval="30s" primitive p_fs_data ocf:heartbeat:Filesystem \ params device="/dev/drbd/by-res/nfs" directory="/mnt/data" fstype="ext3" \ op monitor interval="10s" primitive p_ip_nfs ocf:heartbeat:IPaddr2 \ params ip="192.168.2.190" cidr_netmask="24" \ op monitor interval="30s" group g_nfs p_fs_data p_exportfs_data p_ip_nfs ms ms_drbd_nfs p_drbd_nfs \ meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true" colocation c_nfs_on_drbd inf: g_nfs ms_drbd_nfs:Master order o_drbd_before_nfs inf: ms_drbd_nfs:promote g_nfs:start property $id="cib-bootstrap-options" \ dc-version="1.0.12-unknown" \ cluster-infrastructure="__ openais" \ expected-quorum-votes="2" \ stonith-enabled="false" \ no-quorum-policy="ignore" rsc_defaults $id="rsc-options" \ resource-stickiness="200" Regards, Dennis ______________________________ ___________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org <mailto: Pacemaker@oss. clusterlabs.org > http://oss.clusterlabs.org/__ mailman/listinfo/pacemaker < http://oss.clusterlabs.org/ mailman/listinfo/pacemaker > Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/__ doc/Cluster_from_Scratch.pdf < http://www.clusterlabs.org/ doc/Cluster_from_Scratch.pdf > Bugs: http://bugs.clusterlabs.org -- esta es mi vida e me la vivo hasta que dios quiera ______________________________ _________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/ mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/ doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org ______________________________ _________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/ mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/ doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org </blockquote> -- esta es mi vida e me la vivo hasta que dios quiera _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
_______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
