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

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106 Setting up I/O fencingSetting up I/O fencing for VCSStopping VCS on all nodesTo create the vxfencoorddg disk group1 On any node, create the disk group by specifying the device name of thedisks:# vxdg -o coordinator=on init vxfencoorddg c1t1d0s02 Add the other two disks to the disk group:# vxdg -g vxfencoorddg adddisk c2t1d0s0# vxdg -g vxfencoorddg adddisk c3t1d0s0Before configuring the coordinator disk for use, you must stop VCS on all nodes.To stop VCS on all nodes◆On one node, enter:# hastop -allConfiguring /etc/vxfendg disk group for I/O fencingAfter setting up the coordinator disk group, configure it for use.To configure the disk group for fencing1 Deport the disk group:# vxdg deport vxfencoorddg2 Import the disk group with the -t option to avoid automatically importing itwhen the nodes restart:# vxdg -t import vxfencoorddg3 Deport the disk group. Deporting the disk group prevents the coordinatordisks from serving other purposes:# vxdg deport vxfencoorddg4 On all nodes, type:# echo "vxfencoorddg" > /etc/vxfendgDo not use spaces between the quotes in the “vxfencoorddg” text.This command creates the /etc/vxfendg file, which includes the name of thecoordinator disk group.Based on the contents of the /etc/vxfendg and /etc/vxfenmode files, the rcscript creates the /etc/vxfentab file for use by the vxfen driver when thesystem starts. The rc script also invokes the vxfenconfig command, whichconfigures the vxfen driver to start and use the coordinator disks listed in/etc/vxfentab. The /etc/vxfentab file is a generated file; do not modify thisfile.
Setting up I/O fencingSetting up I/O fencing for VCS107Example /etc/vxfentab fileThe /etc/vxfentab file gets created when you start the I/O fencing driver.See “Starting I/O fencing” on page 107.An example of the /etc/vxfentab file on one node resembles:■■Raw disk/dev/rdsk/c1t1d0s2/dev/rdsk/c2t1d0s2/dev/rdsk/c3t1d0s2DMP disk/dev/vx/rdmp/c1t1d0s2/dev/vx/rdmp/c2t1d0s2/dev/vx/rdmp/c3t1d0s2In some cases you must remove disks from or add disks to an existing coordinator disk group.See “Adding or removing coordinator disks” on page 125.Updating /etc/vxfenmode fileYou must update the /etc/vxfenmode file to operate in SCSI-3 mode. You canconfigure the vxfen module to use either DMP devices or the underlying rawcharacter devices. Note that you must use the same SCSI-3 disk policy, eitherraw or dmp, on all the nodes.To update /etc/vxfenmode file◆On all cluster nodes, depending on the SCSI-3 mechanism you have chosen,type:■■For DMP configuration:cp /etc/vxfen.d/vxfenmode_scsi3_dmp /etc/vxfenmodeFor raw device configuration:cp /etc/vxfen.d/vxfenmode_scsi3_raw /etc/vxfenmodeStarting I/O fencingYou now need to start I/O fencing on each node. VxFEN, the I/O fencing driver,may already be running, so you need to restart the driver for the newconfiguration to take effect.To stop I/O fencing on a node◆Stop the I/O fencing driver.# /etc/init.d/vxfen stop
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166 Installing VCS on a single node
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