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.

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