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

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8 ContentsChapter 5Setting up I/O fencingAbout I/O fencing ................................................................................................ 97Preventing data corruption with I/O fencing .......................................... 97SCSI-3 persistent reservations .................................................................. 98I/O fencing components ............................................................................. 99Data disks .............................................................................................. 99Coordinator disks ................................................................................. 99I/O fencing operations ..............................................................................100Preparing to configure I/O fencing .................................................................100Checking shared disks for I/O fencing ..................................................100Testing the shared disks for SCSI-3 ................................................101Setting up I/O fencing for VCS ........................................................................103Initializing disks ........................................................................................103Setting up coordinator disk groups ........................................................104Requirements for coordinator disks ...............................................105Creating the coordinator disk group and setting the coordinator attribute .......................................................................................105Stopping VCS on all nodes .......................................................................106Configuring /etc/vxfendg disk group for I/O fencing ..........................106Updating /etc/vxfenmode file ..................................................................107Starting I/O fencing ..................................................................................107Modifying VCS configuration to use I/O fencing .................................. 108Verifying I/O fencing configuration .......................................................109Removing permissions for communication ..........................................109Additional I/O fencing information ................................................................109vxfentsthdw options ..................................................................................110Testing the coordinator disk group using vxfentsthdw -c ..........111Using the -r option for non-destructive testing ............................112Using the -m option ...........................................................................112Using the -f option .............................................................................113Using the -g option ............................................................................113Testing a disk with existing keys ....................................................114About VXFEN tunable parameters ..........................................................114Example of implementing the vxfen_max_delay parameter ......115Configuring the VXFEN parameters ...............................................115How I/O fencing works in different event scenarios ...................................116About the vxfenadm utility ..............................................................................120Registration key formatting ....................................................................121Troubleshooting I/O fencing ...........................................................................122Node is unable to join cluster while another node is being ejected ...122vxfentsthdw fails when SCSI TEST UNIT READY command fails .....122Removing existing keys from disks ........................................................122System panics to prevent potential data corruption ...........................123
Contents9How vxfen driver checks for pre-existing split brain condition .123Case 1: system 2 up, system 1 ejected (actual potential split brain) .....................................................124Case 2: system 2 down, system 1 ejected (apparent potential split brain) ................................................124Clearing keys after split brain using vxfenclearpre command ...........125Adding or removing coordinator disks ...................................................125Chapter 6Verifying the VCS installationAbout verifying the VCS installation ..............................................................129Verifying LLT and GAB configuration files ...................................................129/etc/llthosts .................................................................................................129/etc/llttab ....................................................................................................130/etc/gabtab ..................................................................................................130Verifying the main.cf file ..................................................................................130Example main.cf, for clusters without the GCO option .......................132Example main.cf, for clusters with the GCO option .............................134Verifying LLT, GAB, and cluster operation ....................................................135Verifying LLT ..............................................................................................135Using lltstat -n ....................................................................................135Using lltstat -nvv ...............................................................................136Verifying GAB .............................................................................................138Verifying the cluster ..................................................................................138hasys -display .....................................................................................139Accessing the VCS documentation ..................................................................141Chapter 7 Upgrading to VCS 5.0About upgrading to VCS 5.0 .............................................................................143Upgrading VCS using installvcs program ......................................................143Upgrading VCS to 5.0 ................................................................................144Removing deprecated resource types .............................................144Install VRTSperl in non-global zones .............................................145Starting the upgrade ..........................................................................145Checking upgrade requirements .....................................................146Removing VCS packages from previous versions and installing VCS 5.0 packages ..............................................147Starting VCS ........................................................................................148Completing the upgrade ....................................................................149Upgrading VCS in a secure environment .......................................................150Using the halogin command for native OS accounts with VCS ..........150Upgrading to the VCS 5.0 Java Console ..........................................................152..............................................................................................................................153
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