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Vcs 4 1 guide VCS Guide VCS uses two components LLT and GAB to share data over private networks among systems These components provide the performance and reliability required by VCS LLT Low Latency Transport provides fast kernel-to-kernel communications

VCS Guide VCS uses two components LLT and GAB to share data over private networks among systems These components provide the performance and reliability required by VCS LLT Low Latency Transport provides fast kernel-to-kernel communications and monitors network connections The system administrator con ?gures LLT by creating the con ?guration ?les etc llthosts which lists all the systems in the cluster and etc llttab which describes the local system ? s private network links to the other systems in the cluster GAB Group Membership and Atomic Broadcast provides the global message order required to maintain a synchronized state among the systems and monitors disk communications such as that required by the VCS heartbeat utility The system administrator con ?gures GAB driver by creating a con ?guration ?le etc gabtab For the VCS private network two types of channels are available for heartbeating network connections and heartbeat regions on shared disks VCS processes had hashadow Check VCS license vxlicinst Licenses a VERITAS product already installed on a system vxlicrep Enables you to view currently installed licenses vxlictest Retrieves features encoded in a license key and describes them Update system-level licensing information on all nodes in the cluster hasys - updatelic -all VCS Packages VRTSperl VERITAS Perl Redistribution VRTSat VERITAS Authentication Service VRTSllt VERITAS Low Latency Transport VRTSgab VERITAS Group Membership and Atomic Broadcast VRTSvxfen VERITAS I O Fencing VRTSvcs VERITAS Cluster Server VRTSvcsmg VERITAS Cluster Server Message Catalogs VRTSvcsag VERITAS Cluster Server Bundled Agents VRTSvcsmn VERITAS Cluster Server Man Pages VRTSvcsdc VERITAS Cluster Server Documentation VRTSjre VERITAS Java Runtime Environment Redistribution VRTScutil VERITAS Cluster Utilities VRTScssim VERITAS Cluster Server Simulator VRTScscw VERITAS Cluster Server Con ?guration Wizards VRTSweb VERITAS Java Web Server VRTSvcsw VERITAS Cluster Manager Web Console VRTScscm VERITAS Cluster Server Cluster Manager The optional packages included with VCS include VRTSvcsmn manual pages for VCS commands CVRTSvcsdc VCS documentation VRTSvxfen I O fencing VRTSvcssim the VCS Simulator VRTScscm the VCS Cluster Manager VCS Installation Program installvcs can create a response ?le to create unattended installations uninstallvcs VCS con ?guration ?les etc llthosts etc llttab etc gabtab etc VRTSvcs conf nodename etc VRTSvcs conf con ?g main cf types cf etc etc llthosts example north south etc llttab example set-node north set-cluster link qfe dev qfe - ether - link qfe dev qfe - ether - - opt VRTSvcs bin ?? vcs agents etc var VRTSvcs log DISK HEARTBEAT The illustrated con ?guration is speci ?ed in a etc gabtab ?le that resembles sbin gabdiskhb -a dev dsk c t d s -s -p a sbin gabdiskhb -a dev dsk c t d s -s -p h sbin gabdiskhb -a dev dsk c t d s -s -p a sbin gabdiskhb -a dev dsk c t d s -s -p h sbin gabcon ?g -c -n The -s option to the gabdiskhb command speci ?es the start location of each -block region The -p option speci ?es the port the value ??a ? speci ?es the GAB control port and the