Specifying A Persistent Major Number; Installation Tasks; Installing Gfs Rpms - Red Hat GFS 6.0 Administrator's Manual

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3.1.1.2. Clock Synchronization Software
Make sure that each GFS node is running clock synchronization software. The system clocks in GFS
nodes need to be within a few minutes of each other to prevent unnecessary inode time-stamp updates.
If the node clocks are not synchronized, the inode time stamps will be updated unnecessarily, severely
impacting cluster performance. Refer to Section 9.9 Configuring
mation.
Note
One example of time synchronization software is the Network Time Protocol (NTP) software. You can
find more information about NTP at http://www.ntp.org.
3.1.1.3.
Stunnel
The utility needs to be installed only on nodes that use the HP RILOE PCI card for I/O fenc-
Stunnel
ing. (For more information about fencing with the HP RILOE card, refer to HP RILOE Card on page
147.) Verify that the utility is installed on each of those nodes by looking for
The utility is available via
Stunnel

3.1.2. Specifying a Persistent Major Number

The major number is set dynamically when the
through an
init.d
was loaded. If you want to specify a persistent major number rather than a dynamic major
pool.o
number, edit the
/etc/modules.conf
the major number that you want to use:
options pool pool_major=MajorNumber
For example, to specify a major number of 121, edit
line:
options pool pool_major=121
You need to edit the

3.2. Installation Tasks

To install GFS, perform the following steps:
1. Install GFS RPMs.
2. Load the GFS kernel modules.
Utility
up2date
script). In earlier releases of GFS, the major number was set to 121 each time
file to include the following line, where MajorNumber is
/etc/modules.conf
.
module is loaded (either interactively or
pool.o
/etc/modules.conf
on each node running
Chapter 3. Installing GFS
Updates for additional infor-
atime
/usr/sbin/stunnel
to include the following
.
pool
.