I feel like this is something that must have been covered extensively already
but I've done a lot of googling, looked at a lot of cluster configs, but have
not found the solution.
I have an HA NFS cluster (corosync+pacemaker). The relevant rpms are listed
below but I'm not sure they are that important to the question which is this...
When performing managed failovers of the NFS-exported file system resource from
one node to the other (crm resource move), any active NFS clients experience an
I/O error when the file system is unexported. In other words, you must
unexport it to unmount it. As soon as it is unexported, clients are no longer
able to write to it and experience an I/O error (rather than just blocking).
In a failure scenario this is not a problem becuase the file system is never
unexported on the primary server. Rather the server just goes down, the
secondary takes over the resources and client I/O blocks until the process is
complete and then goes about its business. We would like this same behavior
for a *managed* failover but have not found a mount or export option/scenario
that works. Is it possible? What am I missing?
I realize this is more of an nfs/exportfs question but I would think that those
implementing NFS HA clusters would be familiar with the scenario I'm describing.
Regards,
Charlie Taylor
pacemaker-cluster-libs-1.1.7-6.el6.x86_64
pacemaker-cli-1.1.7-6.el6.x86_64
pacemaker-1.1.7-6.el6.x86_64
pacemaker-libs-1.1.7-6.el6.x86_64
resource-agents-3.9.2-40.el6.x86_64
fence-agents-3.1.5-35.el6.x86_64
Red Hat Enterprise Linux Server release 6.3 (Santiago)
Linux biostor3.ufhpc 2.6.32-279.19.1.el6.x86_64 #1 SMP Sat Nov 24 14:35:28 EST
2012 x86_64 x86_64 x86_64 GNU/Linux
[root@biostor4 bs34]# crm status
============
Last updated: Thu Jul 17 10:55:04 2014
Last change: Thu Jul 17 07:59:47 2014 via crmd on biostor3.ufhpc
Stack: openais
Current DC: biostor3.ufhpc - partition with quorum
Version: 1.1.7-6.el6-148fccfd5985c5590cc601123c6c16e966b85d14
2 Nodes configured, 2 expected votes
20 Resources configured.
============
Online: [ biostor3.ufhpc biostor4.ufhpc ]
Resource Group: grp_b3v0
vg_b3v0 (ocf::heartbeat:LVM): Started biostor3.ufhpc
fs_b3v0 (ocf::heartbeat:Filesystem): Started biostor3.ufhpc
ip_vbio3 (ocf::heartbeat:IPaddr2): Started biostor3.ufhpc
ex_b3v0_1 (ocf::heartbeat:exportfs): Started biostor3.ufhpc
ex_b3v0_2 (ocf::heartbeat:exportfs): Started biostor3.ufhpc
ex_b3v0_3 (ocf::heartbeat:exportfs): Started biostor3.ufhpc
ex_b3v0_4 (ocf::heartbeat:exportfs): Started biostor3.ufhpc
ex_b3v0_5 (ocf::heartbeat:exportfs): Started biostor3.ufhpc
Resource Group: grp_b4v0
vg_b4v0 (ocf::heartbeat:LVM): Started biostor4.ufhpc
fs_b4v0 (ocf::heartbeat:Filesystem): Started biostor4.ufhpc
ip_vbio4 (ocf::heartbeat:IPaddr2): Started biostor4.ufhpc
ex_b4v0_1 (ocf::heartbeat:exportfs): Started biostor4.ufhpc
ex_b4v0_2 (ocf::heartbeat:exportfs): Started biostor4.ufhpc
ex_b4v0_3 (ocf::heartbeat:exportfs): Started biostor4.ufhpc
ex_b4v0_4 (ocf::heartbeat:exportfs): Started biostor4.ufhpc
ex_b4v0_5 (ocf::heartbeat:exportfs): Started biostor4.ufhpc
st_bio3 (stonith:fence_ipmilan): Started biostor4.ufhpc
st_bio4 (stonith:fence_ipmilan): Started biostor3.ufhpc
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