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Chapter 2. Hardware Installation and Operating System Configuration 21
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For remote file systems such as NFS, you may use gigabit Ethernet for improved band-
width over 10/100 Ethernet connections. Consider redundant links or channel bonding
for improved remote file system availability. Refer to Section 2.5.1 Configuring Ethernet
Channel Bonding for more information.
•
Multi-initiator SCSI configurations are not supported due to the difficulty in obtaining
proper bus termination. Refer to Appendix A Supplementary Hardware Information for
more information about configuring attached storage.
•
A shared partition can be used by only one cluster service.
•
Do not include any file systems used as a resource for a cluster service in the node’s
local
/etc/fstab
files, because the cluster software must control the mounting and
unmounting of service file systems.
•
For optimal performance of shared file systems, make sure to specify a 4 KB block size
with the
mke2fs -b
command. A smaller block size can cause long
fsck
times. Refer
to Section 2.5.3.2 Creating File Systems .
After setting up the shared disk storage hardware, partition the disks and create file systems
on the partitions. Refer to Section 2.5.3.1 Partitioning Disks , and Section 2.5.3.2 Creating
File Systems for more information on configuring disks.
2.3.3. Setting Up a Console Switch
Although a console switch is not required for cluster operation, it can be used to facilitate
node management and eliminate the need for separate monitors, mouses, and keyboards
for each cluster node. There are several types of console switches.
For example, a terminal server enables connection to serial consoles and management of
many nodes from a remote location. For a low-cost alternative, use a KVM (keyboard,
video, and mouse) switch, which enables multiple nodes to share one keyboard, monitor,
and mouse. A KVM switch is suitable for configurations in which GUI access to perform
system management tasks is preferred.
Set up the console switch according to the documentation provided by the vendor.
After the console switch has been set up, connect it to each cluster node. The cables used
depend on the type of console switch. For example, a Cyclades terminal server uses RJ45
to DB9 crossover cables to connect a serial port on each node to the terminal server.
2.3.4. Setting Up a Network Switch or Hub
A network switch or hub, although not required for operating a two-node cluster, can be
used to facilitate cluster and client system network operations. Clusters of more than two
nodes require a switch or hub.
Set up a network switch or hub according to the documentation provided by the vendor.