Installation guide

As of the Red Hat Enterprise Linux 6.2 release, the nodes in a cluster can communicate with each
other using the UD P Unicast transport mechanism. It is recommended, however, that you use IP
multicasting for the cluster network. UDP Unicast is an alternative that can be used when IP
multicasting is not available. For GFS2 deployments using UDP Unicast is not recommended.
Click Apply. When changing the transport type, a cluster restart is necessary for the changes to take
effect.
3.5.4 . Configuring Redundant Ring Prot ocol
As of Red Hat Enterprise Linux 6.4, the Red Hat High Availability Add-On supports the configuration
of redundant ring protocol. When using redundant ring protocol, there are a variety of
considerations you must take into account, as described in Section 7.6, “ Configuring Redundant
Ring Protocol” .
Clicking on the Red u n d an t R in g tab displays the Red u n d an t Rin g Pro t o co l Co n f ig u rat io n
page. This page displays all of the nodes that are currently configured for the cluster. If you are
configuring a system to use redundant ring protocol, you must specify the Alt ern at e Name for each
node for the second ring.
The Red u n d an t Rin g Pro t o co l Co n f ig u rat io n page optionally allows you to specify the
Alt ern at e Rin g Mu lt icast Add ress, the Alt ern at e Rin g CMAN Po rt , and the Alt ern at e Rin g
Mu lt icast Packet T T L for the second ring.
If you specify a multicast address for the second ring, either the alternate multicast address or the
alternate port must be different from the multicast address for the first ring. If you specify an alternate
port, the port numbers of the first ring and the second ring must differ by at least two, since the system
itself uses port and port-1 to perform operations. If you do not specify an alternate multicast address,
the system will automatically use a different multicast address for the second ring.
3.5.5. Quorum Disk Configurat ion
Clicking on the Q Disk tab displays the Q u o ru m Disk Co n f ig u rat io n page, which provides an
interface for configuring quorum disk parameters if you need to use a quorum disk.
Important
Quorum disk parameters and heuristics depend on the site environment and the special
requirements needed. To understand the use of quorum disk parameters and heuristics, refer
to the qdisk(5) man page. If you require assistance understanding and using quorum disk,
contact an authorized Red Hat support representative.
The Do No t Use a Q u o ru m Disk parameter is enabled by default. If you need to use a quorum
disk, click Use a Q u o ru m Disk, enter the quorum disk parameters, and click Apply. You must
restart the cluster for the changes to take effect.
Table 3.1, “ Quorum-Disk Parameters” describes the quorum disk parameters.
T ab le 3.1. Q u o ru m- D isk Paramet ers
Paramet er Descrip t io n
⁠Chapt er 3. Configuring Red Hat Hig h Availabilit y Add- O n Wit h Conga
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