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

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182 Advanced topics related to installing VCSLLT over UDPNote: LLT over UDP is not supported on IPV6.When to use LLT over UDPUse LLT over UDP when:Configuring LLT over UDP■■LLT must be used over WANsWhen hardware, such as blade servers, do not support LLT over EthernetPerformance considerationsBecause LLT over UDP is slower that LLT over Ethernet, LLT over UDP shouldonly be used when the hardware configuration makes it necessary.Following is a checklist for configuring LLT over UDP. Examples are provided inthe sections that follow.■■■■■■Make sure that the LLT private links are on different physical networks.If the LLT private links are not on different physical networks, then make sure that the links are on separate subnets. Set the broadcast address in /etc/llttab explicitly depending on the subnet for each link. See “Broadcast address in the /etc/llttab file” on page 182.See the examples in the following sections.Make sure that each NIC has an IP address configured before configuringLLT.Make sure the IP addresses in the /etc/llttab files are consistent with the IPaddresses of the network interfaces.Make sure that each link has a unique non-well known UDP port.See “Selecting UDP ports” on page 184.Set the broadcast address correctly for direct-attached (non-routed) links.For links that cross an IP router, disable broadcast features and specify theIP address of each link manually in the /etc/llttab file.See “Sample configuration: Links crossing IP routers” on page 186.Broadcast address in the /etc/llttab fileThe broadcast address is set explicitly for each link in the following example.# cat /etc/llttabset-node Node0
Advanced topics related to installing VCSLLT over UDP183set-cluster 1link link1 /dev/udp - udp 50000 -link link2 /dev/udp - udp 50001 -10.20.30.1 10.20.30.25510.20.31.1 10.20.31.255Verify the subnet mask using the ifconfig command to ensure that the twolinks are on separate subnets.The link command in the /etc/llttab fileTable A-7 describes the fields of the link command shown in the /etc/llttab file examples.See “Sample configuration: Direct-attached links” on page 185.See “Sample configuration: Links crossing IP routers” on page 186.Note that some of these fields differ from the command for standard LLT links.Table A-7FieldField description for link command in /etc/llttabDescriptionA unique string that is used as a tag by LLT; for example link1,link2,….The device path of the UDP protocol; for example /dev/udp.Nodes using the link. “-” indicates all cluster nodes are to beconfigured for this link.Type of link; must be “udp” for LLT over UDP.Unique UDP port in the range of 49152-65535 for the link.See “Selecting UDP ports” on page 184.“-” is the default, which has a value of 8192. The value may beincreased or decreased depending on the configuration. Use thelltstat -l command displays the current value.IP address of the link on the local node. ■ For clusters having broadcasts enabled, specify the value ofthe subnet broadcast address.■ “-” is the default for clusters spanning routers.The set-addr command in the /etc/llttab fileThe set-addr command in the /etc/llttab file is required when the broadcastfeature of LLT is disabled, such as when LLT must cross IP routers. Table A-8describes the fields of the set-addr command.
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