3.1.2 Matrix Server Administration Guide

Chapter 18: SAN Maintenance 238

Increase the Membership Partition Timeout

Under heavy I/O load, I/O timeouts can occur on membership partition

accesses, which can cause excessive I/O path switching. If you experience

this problem, increasing the membership partition timeout may resolve

the issue.

Before setting the timeout, be sure to stop Matrix Server.

To increase the timeout, edit the file /etc/opt/polyserve/mxinit.conf. Locate

the following line in the file:

# sanpulse_start_options = { "--mxinit" };

You will need to add the parameter "--mptimeout=<sec>" to the start

options. Also remove the comment character (#) from the beginning of

the line:

sanpulse_start_options = { "--mxinit","--mptimeout=<sec>" };

<sec> is the number of seconds (1-255) to be used as the I/O timeout for

accessing membership partitions. The default value is 5. Be sure to

increase the timeout period in small increments. If the timeout value is

too large, more time may be needed for filesystem recovery after a node

failure. The following example sets the timeout to 10 seconds:

sanpulse_start_options = { "--mxinit","--mptimeout=10" };

After adding the parameter, you can restart Matrix Server.

Repeat this procedure on each remaining server. You will also need to set

the timeout on any servers added to the matrix in the future.

Change the Fencing Method

This procedure describes how to change the matrix fencing method on

servers that are already running Matrix Server 3.1.

1. Stop Matrix Server on all servers in the matrix:

# /etc/init.d/pmxs stop

2. Reboot all servers having entries in the Matrix Server host registry.

Use this command to see a list of the affected servers:

# /opt/polyserve/lib/mpdump