Serviceguard NFS Toolkit for Linux Version A.01.04 Release Notes, September 2006

Serviceguard NFS for Linux Version A.01.04 Release Notes
Known Problems and Workarounds
Chapter 1 13
• Export the filesystem with an assigned filesystem identification.
NOTE Refer to the README File for more detailed information.
A new configuration file called hanfs.conf has been introduced in this
version, which provides the choice of monitoring the rpc.rquotad
daemon (which is an optional daemon).
JAGag06739: Serviceguard/LX NFS server returns
ESTALE when package is brought down
What is the problem? When the NFS package is brought down, the
client process gets ESTALE from the server while it should not. There is
a delay when the interface is brought down and that package could still
reach the NFS server layer.
This is due to exportfs -u, and the ESTALE is returned. When an
interface is brought down, the routes do not get flushed immediately.
Therefore, the server keeps temporarily responding for after shutting
down the interface.
What is the workaround?
Do the following steps on all the nodes that are configured for running
NFS package to set min_delay to zero while the system is running:
1. Run the command
# echo 0 > /proc/sys/net/ipv4/route/min_delay
2. Add the following line in /etc/sysctl.conf (in order to have
persistent min_delay value across server boots)
net.ipv4.route.min_delay = 0.
NOTE Instructions in steps 1 and 2 needs to be done all nodes.
Instruction in step 2 ensures that min_delay is set to zero after system
reboot. This ensures that persistent min_delay value is set across server
reboots and hence after reboot, step 1 need not be followed.