Cluster Server Installation Guide for Solaris x64 5.0 - Storage ...

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174 Installing VCS on a single nodeAdding a node to a single-node clusterThe first line must identify the system on which the file exists. In the exampleabove, the value for set-node could be north, 0, or the file name /etc/nodename,provided the file contains the name of the system (north in this example). Thenext two lines, beginning with the link command, identify the two privatenetwork cards that the LLT protocol uses. The order of directives must be thesame as in the sample file /opt/VRTSllt/llttab.LLT directivesFor more information about LLT directives, refer to the llttab(4) manual page.Table 9-6Directiveset-nodelinkset-clusterlink-lowpriLLT directivesDescriptionAssigns the system ID or symbolic name. The system ID numbermust be unique for each system in the cluster, and must be in therange 0-31. The symbolic name corresponds to the system IDlisted in /etc/llthosts file.Note that LLT fails to operate if any systems share the same ID.Attaches LLT to a network interface. At least one link is required,and up to eight are supported. The first argument to link is a userdefinedtag shown in the lltstat(1M) output to identify thelink. It may also be used in llttab to set optional static MACaddresses.The second argument to link is the device name of the networkinterface. Its format is device_name:device_instance_number. Theremaining four arguments to link are defaults; these argumentsshould be modified only in advanced configurations. There shouldbe one link directive for each network interface. LLT uses anunregistered Ethernet SAP of 0xCAFE. If the SAP is unacceptable,refer to the llttab(4) manual page for information on how tocustomize SAP. Note that IP addresses do not need to be assignedto the network device; LLT does not use IP addresses.Assigns a unique cluster number. Use this directive when morethan one cluster is configured on the same physical networkconnection. LLT uses a default cluster number of zero.Use this directive in place of link for public network interfaces.This directive prevents VCS communication on the public networkuntil the network is the last link, and reduces the rate of heartbeatbroadcasts. Note that LLT distributes network traffic evenly acrossall available network connections and, in addition to enabling VCScommunication, broadcasts heartbeats to monitor each networkconnection.
Installing VCS on a single nodeAdding a node to a single-node cluster175For more information about LLT directives, refer to the llttab(4) manual page.Additional considerations for LLTYou must attach each network interface that is configured for LLT to a separateand distinct physical network.By default, Sun systems assign the same MAC address to all interfaces. Thus,connecting two or more interfaces to a network switch can cause problems. Forexample, if IP is configured on one public interface and LLT on another, andboth interfaces are connected to a switch, the duplicate MAC address on the twoswitch ports can cause the switch to incorrectly redirect IP traffic to the LLTinterface and vice-versa. To avoid this, configure the system to assign uniqueMAC addresses by setting the eeprom(1M) parameter local-mac-address? totrue.Configuring group membership and atomic broadcast (GAB)To configure GAB, use vi or another editor to set up an /etc/gabtabconfiguration file on each node in the cluster. The following example shows asimple /etc/gabtab file:/sbin/gabconfig -c -nNWhere the -c option configures the driver for use and -nN specifies that thecluster is not formed until at least N systems are ready to form the cluster. Bydefault, N is the number of systems in the cluster.Note: Symantec does not recommend the use of the -c -x option for /sbin/gabconfig. Using -c -x dramatically increases configuration time for theGigabit Ethernet controller and can lead to a split-brain condition.Starting LLT and GABOn the new node, start LLT and GAB.To start LLT and GAB1 Start LLT on Node B.# /etc/rc2.d/S70llt start2 Start GAB on Node B.# /etc/rc2.d/S92gab start
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