Veritas Storage Foundation 5.1 SP1 Cluster File System Installation Guide (5900-1510, April 2011)

■ If you are using a C shell (csh or tcsh), enter the following:
% set path = ( $path /usr/sbin /opt/VRTS/bin )
% setenv MANPATH /usr/share/man:/opt/VRTS/man:$MANPATH
Optimizing LLT media speed settings on private NICs
For optimal LLT communication among the cluster nodes, the interface cards on
each node must use the same media speed settings. Also, the settings for the
switches or the hubs that are used for the LLT interconnections must match that
of the interface cards. Incorrect settings can cause poor network performance or
even network failure.
If you use different media speed for the private NICs, Symantec recommends that
you configure the NICs with lesser speed as low-priority links to enhance LLT
performance.
Guidelines for setting the media speed of the LLT
interconnects
Review the following guidelines for setting the media speed of the LLT
interconnects:
■ Symantec recommends that you manually set the same media speed setting
on each Ethernet card on each node.
If you use different media speed for the private NICs, Symantec recommends
that you configure the NICs with lesser speed as low-priority links to enhance
LLT performance.
■ If you have hubs or switches for LLT interconnects, then set the hub or switch
port to the same setting as used on the cards on each node.
■ If you use directly connected Ethernet links (using crossover cables), Symantec
recommends that you set the media speed to the highest value common to
both cards, typically 1000_Full_Duplex.
Details for setting the media speeds for specific devices are outside of the scope
of this manual. Consult the device’s documentation for more information.
Creating the /opt directory
The directory /opt must exist, be writable and must not be a symbolic link.
33Before you install
Optimizing LLT media speed settings on private NICs