Delivering Continuity and Extreme Capacity with the IBM DB2 pureScale Feature

Chapter 3. Implementation and setup 149

3.2.10 Step 10: Blacklisting the system watchdog modules

The DB2 pureScale feature uses its own watchdog module. Therefore, you must

blacklist the system watchdog modules to avoid any conflict. This section

describes how to blacklist these modules.

SUSE Linux Enterprise Server 11

To blacklist the system watchdog module on SUSE Linux Enterprise Server 11,

complete the following steps:

1. Add the following lines to the /etc/modprobe.d/blacklist file:

alias iTCO_wdt off

alias iTCO_vendor_support off

2. Reboot the server to pick up the changes.

Red Hat Enterprise Linux 5 and 6

To blacklist the system watchdog module on Red Hat Enterprise Linux 5 and 6,

complete the following steps:

1. Add the following lines to the /etc/modprobe.d/blacklist.conf file:

blacklist iTCO_wdt

blacklist iTCO_vendor_support

2. Reboot the server to pick up the changes.

3.2.11 Step 11: Modifying the mlx4_core parameter

For the cluster CF to start with higher memory regions for communication

buffers, increase the Mellanox HCA driver mlx4_core mlx4_core parameter to 7.

Important: Complete this task on all servers in the cluster.

Important: You added the system watchdog module to the blacklist on SUSE

Linux Enterprise Server 11. Continue to 3.2.11, “Step 11: Modifying the

mlx4_core parameter” on page 149.

Important: You added the system watchdog module to the blacklist on Red

Hat Enterprise Linux 5 and 6. Continue to the next section.

Attention: Complete this task on all servers in the cluster.