Red Hat Cluster Suite: Configuring and Managing a Cluster
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# Index

## Symbols

/etc/hosts
  editing, Editing the /etc/hosts File
/etc/sysconfig/ha/lvs.cf file, /etc/sysconfig/ha/lvs.cf
/etc/sysconfig/rawdevices
  editing the file, Editing the rawdevices File

## A

acknowledgments, Acknowledgments
active router
  See LVS clustering
active-active configuration, Red Hat Cluster Manager Overview
Apache HTTP Server
  httpd.conf, Installing and Configuring the Apache HTTP Server
  setting up service, Setting Up Apache HTTP Server
availability and data integrity table, Minimum Hardware Requirements

## B

backup router
  See LVS clustering

## C

channel bonding
  See Ethernet bonding
chkconfig, Configuring Services on the LVS Routers
cluster
  See cluster types
  administration, Cluster Administration
  checking the configuration, Checking the Cluster Configuration, Using the shutil Utility
  daemons, Configuring Cluster Daemons
  diagnosing and correcting problems, Diagnosing and Correcting Problems in a Cluster
  disabling the cluster software, Disabling the Cluster Software
  displaying status, Displaying Cluster and Service Status
  name, changing, Changing the Cluster Name
  using Red Hat Cluster Manager with Piranha, Using Red Hat Cluster Manager with Piranha
cluster administration, Cluster Administration
  backing up the cluster database, Backing Up and Restoring the Cluster Database
  changing the cluster name, Changing the Cluster Name
  diagnosing and correcting problems in a cluster, Diagnosing and Correcting Problems in a Cluster
  disabling the cluster software, Disabling the Cluster Software
  displaying cluster and service status, Displaying Cluster and Service Status
  modifying cluster event logging, Modifying Cluster Event Logging
  modifying the cluster configuration, Modifying the Cluster Configuration
  restoring the cluster database, Backing Up and Restoring the Cluster Database
  starting and stopping the cluster software, Starting and Stopping the Cluster Software
  updating the cluster software, Updating the Cluster Software
cluster command-line utilities, Cluster Command-line Utilities
cluster communication mechanisms, Cluster Communication Mechanisms
cluster configuration, Checking the Cluster Configuration
  minimum
    example, Minimum Hardware Requirements
  modifying, Modifying the Cluster Configuration
  reloading, Configuring the Cluster Software
  using the shutil utility, Using the shutil Utility
Cluster Configuration Tool
  accessing, The Cluster Configuration Tool
  and Oracle service, Oracle and the Cluster Configuration Tool
cluster daemons, Configuring Cluster Daemons
  membership daemon, Configuring clumembd
  quorum daemon, Configuring cluquorumd
  service manager daemon, Configuring the clusvcmgrd daemon
cluster database
  backing up, Backing Up and Restoring the Cluster Database
  restoring, Backing Up and Restoring the Cluster Database
cluster event logging
  daemons
    cluhbd, Modifying Cluster Event Logging
    clupowerd, Modifying Cluster Event Logging
    cluquorumd, Modifying Cluster Event Logging
    clusvcmgrd, Modifying Cluster Event Logging
  severity levels, Modifying Cluster Event Logging
cluster features
  administration user interface, Red Hat Cluster Manager Features
  application monitoring, Red Hat Cluster Manager Features
  data integrity assurance, Red Hat Cluster Manager Features
  event logging facility, Red Hat Cluster Manager Features
  failover domain
    restricted, Red Hat Cluster Manager Features
    unrestricted, Red Hat Cluster Manager Features
  manual service relocation capabilities, Red Hat Cluster Manager Features
  multiple cluster communication methods, Red Hat Cluster Manager Features
  no-single-point-of-failure hardware configuration, Red Hat Cluster Manager Features
  service configuration framework, Red Hat Cluster Manager Features
  service failover capabilities, Red Hat Cluster Manager Features
  status monitoring agent, Red Hat Cluster Manager Features
cluster hardware
  connecting, Setting Up and Connecting the Cluster Hardware
  power controllers, Choosing the Type of Power Controller
  setting up, Setting Up and Connecting the Cluster Hardware
cluster hardware tables, Cluster Hardware Components
cluster member hardware table, Cluster Hardware Components
cluster overview, Red Hat Cluster Manager Overview
cluster service, Red Hat Cluster Manager Overview
  displaying status, Displaying Cluster and Service Status
cluster services
  active-active NFS configuration, NFS Configuration: Active-Active Example
  administration, Service Administration
  Apache HTTP Server, setting up, Setting Up Apache HTTP Server
    httpd.conf, Installing and Configuring the Apache HTTP Server
  configuration, Adding a Service to the Cluster, Configuring a Service
  configuring service disk storage, Configuring Service Disk Storage
  deleting a service, Deleting a Service
  disabling a service, Disabling a Service
  displaying a service configuration, Displaying a Service Configuration
  enabling a service, Enabling a Service
  gathering service information, Gathering Service Information
  handling a service that fails to start, Handling Failed Services
  modifying a service, Modifying a Service
  MySQL service, setting up, Setting Up a MySQL Service
  NFS caveats, NFS Caveats
  NFS client access, NFS Client Access
  NFS Druid, Using the NFS Druid
  NFS server requirements, NFS Server Requirements
  NFS service, setting up, Setting Up an NFS Service
  Oracle service, setting up, Setting Up an Oracle Service
  Oracle, tuning, Tuning Oracle Service
  relocating a service, Relocating a Service
  Samba Druid, Using the Samba Druid
  Samba operating model, Samba Operating Model
  Samba server requirements, Samba Server Requirements
  Samba service, setting up, Setting Up a Samba Service
  scripts, creating, Creating Service Scripts
  smb.conf.sharename file fields, Fields in the smb.conf.sharename File
  verifying application software and service scripts, Verifying Application Software and Service Scripts
cluster software
  command-line utilities, Cluster Command-line Utilities
  disabling, Disabling the Cluster Software
  installation and configuration, Cluster Configuration
    steps for installing and initializing, Installing the Red Hat Cluster Suite Packages
    with rpm, Installation with rpm
    with the Package Management Tool, Installation with the Package Management Tool
  starting and stopping, Starting and Stopping the Cluster Software
  steps for installing and initializing, Installing the Red Hat Cluster Suite Packages
  updating, Updating the Cluster Software
  version display, Displaying the Cluster Software Version
cluster software installation and configuration, Cluster Configuration
cluster systems, Red Hat Cluster Manager Overview
cluster types
  compute-clustering
    Beowulf, Technology Overview
    definition of, Technology Overview
  high-availability clustering, Technology Overview
    See also Red Hat Cluster Manager
    definition of, Technology Overview
  load-balance clustering, Technology Overview
    See also LVS clustering
    definition of, Technology Overview
  overview of, Technology Overview
clusvcadm
  using, Using the clusvcadm Utility
common cluster behaviors
  2-4 Member cluster, IP tie-breaker, Common Behaviors: 2-4 Member Cluster with IP-based Tie-Breaker
  3-5 Member Cluster, Common Behaviors: 3-5 Member Cluster
  miscellaneous, Common Behaviors: Miscellaneous
  service daemons, Common Behaviors: Cluster Service Daemons
  two member disk-based tie-breaker, Common Behaviors: Two Member Cluster with Disk-based Tie-breaker
common cluster behaviors table, Common Cluster Behaviors: General
components
  of LVS cluster, Components of an LVS Cluster
compute-clustering
  See cluster types
configuration
  Red Hat Enterprise Linux, Installing and Configuring Red Hat Enterprise Linux
configuration file
  reloading, Configuring the Cluster Software
configuring a service, Configuring a Service
console startup messages
  displaying, Displaying Console Startup Messages
console switch, Minimum Hardware Requirements
  setting up, Setting Up a Console Switch
console switch hardware table, Cluster Hardware Components
conventions
  document, Document Conventions

## D

daemons
  clulockd
    configuring, Configuring Cluster Daemons
  clumembd
    configuring, Configuring Cluster Daemons
  cluquorumd
    configuring, Configuring Cluster Daemons
  clurmtabd
    configuring, Configuring Cluster Daemons
  clusvcmgrd
    configuring, Configuring Cluster Daemons
database service, Red Hat Cluster Manager Features
databases
  MySQL
    setting up service, Setting Up a MySQL Service
  Oracle
    oraclescript example, Setting Up an Oracle Service
    setting up, Setting Up an Oracle Service
    startdb script example, Setting Up an Oracle Service
    stopdb script example, Setting Up an Oracle Service
    tuning, Tuning Oracle Service
    using Cluster Configuration Tool with, Oracle and the Cluster Configuration Tool
deleting a service, Deleting a Service
diagnosing and correcting problems in a cluster
  table, Diagnosing and Correcting Problems in a Cluster
disabling a service, Disabling a Service
disk storage
  configuring service disk storage, Configuring Service Disk Storage
displaying a service configuration, Displaying a Service Configuration
displaying console startup messages, Displaying Console Startup Messages
displaying devices configured in the kernel, Displaying Devices Configured in the Kernel

## E

enabling a service, Enabling a Service
Ethernet channel bonding
  configuring, Configuring Ethernet Channel Bonding
event logging
  modifying, Modifying Cluster Event Logging
  syslog
    configuring, Configuring syslogd Event Logging
examples
  minimum cluster configuration, Minimum Hardware Requirements
  NFS Druid, Using the NFS Druid
  no single point of failure configuration, Minimum Hardware Requirements
  oracle script, Setting Up an Oracle Service
  Samba Druid, Using the Samba Druid
  startdb script, Setting Up an Oracle Service
  stopdb script, Setting Up an Oracle Service
  using Cluster Configuration Tool to add an Oracle service, Oracle and the Cluster Configuration Tool
ext3, Creating File Systems

## F

failover and recover scenarios, Failover and Recovery Scenarios
features, cluster, Red Hat Cluster Manager Features
feedback, Send in Your Feedback
file services
  NFS
    active-active configuration, NFS Configuration: Active-Active Example
    caveats, NFS Caveats
    client access, NFS Client Access
    NFS Druid, Using the NFS Druid
    server requirements, NFS Server Requirements
    setting up service, Setting Up an NFS Service
  Samba
    operating model, Samba Operating Model
    Samba Druid, Using the Samba Druid
    server requirements, Samba Server Requirements
    setting up, Setting Up a Samba Service
file systems
  creating, Creating File Systems
FTP, clustering, FTP In an LVS Cluster
  See also LVS clustering

## G

GFS
  cluster archive
    configuration, Saving Your Configuration and Next Steps
  configuration
    with ccs_tool, Saving Your Configuration and Next Steps
GFS Setup Druid, The GFS Setup Druid
  and CCS files, Choose Location for CCS Files
  cluster name, Cluster Name
  configuration, The GFS Setup Druid
  configuring cluster members, Cluster Members
  fence device configuration, Fence Devices
  GULM settings, LOCK_GULM parameters
  member configuration, Adding a New Member
  post-configuration, Saving Your Configuration and Next Steps
  saving configuration, Saving Your Configuration and Next Steps
Grand Unified Lock Manager
  See GULM
GULM, LOCK_GULM parameters
  configuration with GFS Setup Druid, LOCK_GULM parameters

## H

handling a service that fails to start, Handling Failed Services
hardware
  installing basic cluster hardware, Installing the Basic Cluster Hardware
hardware configuration
  availability considerations, Choosing a Hardware Configuration
  choosing a configuration, Choosing a Hardware Configuration
  cost restrictions, Choosing a Hardware Configuration
  data integrity under all failure conditions, Choosing a Hardware Configuration
  minimum, Minimum Hardware Requirements
  optional hardware, Minimum Hardware Requirements
  performance considerations, Choosing a Hardware Configuration
  shared storage requirements, Shared Storage Requirements
hardware information, supplementary, Supplementary Hardware Information
hardware installation
  operating system configuration, Hardware Installation and Operating System Configuration
hardware watchdog timer
  configuring, Configuring a Hardware Watchdog Timer
hardware watchdog timers, Configuring a Hardware Watchdog Timer
high-availability clustering
  See cluster types
hot-standby configuration, Red Hat Cluster Manager Overview
how to use this manual, How To Use This Manual
HTTP services
  Apache HTTP Server
    httpd.conf, Installing and Configuring the Apache HTTP Server
    setting up, Setting Up Apache HTTP Server

## I

installation
  Red Hat Enterprise Linux, Installing and Configuring Red Hat Enterprise Linux
installing basic cluster hardware, Installing the Basic Cluster Hardware
installing the basic cluster hardware, Installing the Basic Cluster Hardware
introduction, Introduction
  cluster features, Red Hat Cluster Manager Features
  cluster overview, Red Hat Cluster Manager Overview
  how to use this manual, How To Use This Manual
  other Red Hat Enterprise Linux manuals, Introduction
iptables, Configuring Services on the LVS Routers
ipvsadm program, ipvsadm

## J

job scheduling, LVS, LVS Scheduling Overview

## K

kernel
  decreasing kernel boot timeout limit, Decreasing the Kernel Boot Timeout Limit
  displaying configured devices, Displaying Devices Configured in the Kernel
Kernel Boot Timeout Limit
  decreasing, Decreasing the Kernel Boot Timeout Limit
Kimberlite, Acknowledgments
KVM (keyboard, video, mouse) switch, Minimum Hardware Requirements

## L

least connections
  See job scheduling, LVS
Linux Virtual Server
  See LVS clustering
load-balance clustering
  See cluster types
low voltage differential (LVD), SCSI Bus Length
LVS
  /etc/sysconfig/ha/lvs.cf file, /etc/sysconfig/ha/lvs.cf
  components of, Components of an LVS Cluster
  daemon, lvs
  date replication, real servers, Data Replication and Data Sharing Between Real Servers
  definition of, Technology Overview
  initial configuration, Initial LVS Configuration
  ipvsadm program, ipvsadm
  job scheduling, LVS Scheduling Overview
  lvs daemon, lvs
  LVS routers
    configuring services, Initial LVS Configuration
    necessary services, Configuring Services on the LVS Routers
    primary node, Initial LVS Configuration
  multi-port services, Multi-port Services and LVS Clustering
    FTP, FTP In an LVS Cluster
  nanny daemon, nanny
  NAT routing
    enabling, Enabling NAT Routing on the LVS Routers
    requirements, hardware, The NAT LVS Cluster
    requirements, network, The NAT LVS Cluster
    requirements, software, The NAT LVS Cluster
  overview of, Load-Balancing Clusters Using Linux Virtual Servers, Linux Virtual Server Overview
  packet forwarding, Initial LVS Configuration
  Piranha Configuration Tool, Piranha Configuration Tool
  pulse daemon, pulse
  real servers, Load-Balancing Clusters Using Linux Virtual Servers
  routing methods
    NAT, Routing Methods
  routing prerequisites, Configuring Network Interfaces for a NAT LVS Cluster
  scheduling, job, LVS Scheduling Overview
  send_arp program, send_arp
  shared data, Data Replication and Data Sharing Between Real Servers
  starting the cluster, Configuring the LVS Routers with Piranha Configuration Tool
  synchronizing configuration files, Configuring the LVS Routers with Piranha Configuration Tool
  three tiered
    Red Hat Cluster Manager, A Three Tiered LVS Configuration
  using Red Hat Cluster Manager with Piranha, Using Red Hat Cluster Manager with Piranha
lvs daemon, lvs

## M

member status table, Displaying Cluster and Service Status
member systems
  See cluster systems
members
  setting up, Setting Up the Members
membership daemon, Configuring clumembd
minimum cluster configuration example, Minimum Hardware Requirements
minimum hardware configuration, Minimum Hardware Requirements
Mission Critical Linux, Inc., Acknowledgments
mkfs, Creating File Systems
multi-port services, clustering, Multi-port Services and LVS Clustering
  See also LVS clustering
MySQL
  setting up service, Setting Up a MySQL Service

## N

nanny daemon, nanny
NAT
  enabling, Enabling NAT Routing on the LVS Routers
  routing methods, LVS, Routing Methods
network address translation
  See NAT
network hardware table, Cluster Hardware Components
network hub, Minimum Hardware Requirements
network switch, Minimum Hardware Requirements
NFS
  active-active configuration, NFS Configuration: Active-Active Example
  caveats, NFS Caveats
  client access, NFS Client Access
  NFS Druid, Using the NFS Druid
  server requirements, NFS Server Requirements
  setting up service, Setting Up an NFS Service
NMI watchdog timer
  enabling, Enabling the NMI Watchdog Timer
no single point of failure configuration, Minimum Hardware Requirements
Non-Maskable Interrupt (NMI) watchdog timers, Enabling the NMI Watchdog Timer

## O

operating system configuration
  hardware installation, Hardware Installation and Operating System Configuration
Oracle
  adding an Oracle service, Oracle and the Cluster Configuration Tool
  oracle script example, Setting Up an Oracle Service
  setting up service, Setting Up an Oracle Service
  startdb script example, Setting Up an Oracle Service
  stopdb script example, Setting Up an Oracle Service
  tuning service, Tuning Oracle Service
overview
  introduction, Red Hat Cluster Manager Overview

## P

packet forwarding, Initial LVS Configuration
  See also LVS clustering
Parallel SCSI
  requirements, Configuring Shared Disk Storage
parted
  creating disk partitions, Partitioning Disks
partitioning disks, Partitioning Disks
Piranha
  using Red Hat Cluster Manager with, Using Red Hat Cluster Manager with Piranha
Piranha Configuration Tool, Piranha Configuration Tool
  CONTROL/MONITORING, Configuring the LVS Routers with Piranha Configuration Tool
  EDIT MONITORING SCRIPTS Subsection, VIRTUAL SERVERS
  GLOBAL SETTINGS, Configuring the LVS Routers with Piranha Configuration Tool
  limiting access to, Initial LVS Configuration, Limiting Access To the Piranha Configuration Tool
  login panel, Configuring the LVS Routers with Piranha Configuration Tool
  necessary software, Configuring the LVS Routers with Piranha Configuration Tool
  overview of, Configuring the LVS Routers with Piranha Configuration Tool
  REAL SERVER subsection, VIRTUAL SERVERS
  REDUNDANCY, Configuring the LVS Routers with Piranha Configuration Tool
  setting a password, Initial LVS Configuration
  VIRTUAL SERVER subsection
    Firewall Mark, The VIRTUAL SERVER Subsection
    Persistence, The VIRTUAL SERVER Subsection
    Scheduling, The VIRTUAL SERVER Subsection
    Virtual IP Address, The VIRTUAL SERVER Subsection
  VIRTUAL SERVER subsection, VIRTUAL SERVERS
  VIRTUAL SERVERS, Configuring the LVS Routers with Piranha Configuration Tool
piranha-gui service, Configuring Services on the LVS Routers
piranha-passwd, Initial LVS Configuration
point-to-point Ethernet connection hardware table, Cluster Hardware Components
power controller connection, configuring, Configuring a Power Controller Connection
power controllers, Choosing the Type of Power Controller
  network-attached, Choosing the Type of Power Controller
  serial-attached, Choosing the Type of Power Controller
  watchdog timers, Choosing the Type of Power Controller
    hardware-based, Choosing the Type of Power Controller
    software-based, Choosing the Type of Power Controller
power switch, Configuring a Power Controller Connection
  See also power controller
power switch hardware table, Cluster Hardware Components
power switches
  configuring, Configuring Power Switches
  hardware watchdog timers
    configuring, Configuring a Hardware Watchdog Timer
  NMI watchdog timers
    enabling, Enabling the NMI Watchdog Timer
  setting up, Setting Up Power Controllers
    watchdog, Setting up Watchdog Power Switches
  software watchdog timers
    configuration, Configuring the Software Watchdog Timer
  testing, Testing the Power Switches, Using the clufence Utility
  troubleshooting, Testing the Power Switches, Using the clufence Utility
pulse daemon, pulse
pulse service, Configuring Services on the LVS Routers

## Q

quorum daemon, Configuring cluquorumd
quorum partitions
  See shared cluster partitions
  testing, Using the shutil Utility

## R

raw, Creating Raw Devices
raw devices
  creating, Creating Raw Devices
rawdevices
  editing the file, Editing the rawdevices File
real servers
  See LVS clustering
  configuring services, Initial LVS Configuration
Red Hat Cluster Manager, Technology Overview
  and Piranha, Using Red Hat Cluster Manager with Piranha
  command-line utilities, Cluster Command-line Utilities
  with Red Hat GFS, The GFS Setup Druid
Red Hat Cluster Suite, Installing the Red Hat Cluster Suite Packages
  installation, Installing the Red Hat Cluster Suite Packages
    with rpm, Installation with rpm
    with the Package Management Tool, Installation with the Package Management Tool
Red Hat Enterprise Linux, Introduction to Linux Virtual Server
  installation and configuration, Installing and Configuring Red Hat Enterprise Linux
  overview of, Technology Overview
Red Hat GFS
  and Red Hat Cluster Suite, The GFS Setup Druid
Red Hat GFS with Red Hat Cluster Suite
  changes to Red Hat Cluster Suite, Using Red Hat GFS with Red Hat Cluster Suite
  installation scenarios, Using Red Hat GFS with Red Hat Cluster Suite
  terminology, Using Red Hat GFS with Red Hat Cluster Suite
  using, Using Red Hat GFS with Red Hat Cluster Suite
  using GFS Setup Druid, The GFS Setup Druid
relocating a service, Relocating a Service
round robin
  See job scheduling, LVS
routing
  prerequisites for LVS, Configuring Network Interfaces for a NAT LVS Cluster

## S

Samba
  operating model, Samba Operating Model
  Samba Druid, Using the Samba Druid
  server requirements, Samba Server Requirements
  setting up service, Setting Up a Samba Service
  smb.conf.sharename file fields, Fields in the smb.conf.sharename File
scheduling, job (LVS), LVS Scheduling Overview
scripts
  creating service scripts, Creating Service Scripts
  oracle script example, Setting Up an Oracle Service
  startdb script example, Setting Up an Oracle Service
  stopdb script example, Setting Up an Oracle Service
  verifying application software and service scripts, Verifying Application Software and Service Scripts
SCSI bus configuration requirements, SCSI Bus Configuration Requirements
SCSI bus length, SCSI Bus Length
SCSI bus termination, SCSI Bus Termination
SCSI identification numbers, SCSI Identification Numbers
security
  Piranha Configuration Tool, Limiting Access To the Piranha Configuration Tool
send_arp program, send_arp
service configuration, Configuring a Service
service failover, Red Hat Cluster Manager Overview
service property and resource information table, Gathering Service Information
service relocation, Red Hat Cluster Manager Overview
service status table, Displaying Cluster and Service Status
services, Adding a Service to the Cluster
  See also adding to the cluster configuration
shared cluster partitions
  configuring, Configuring Shared Cluster Partitions
  requirements, Configuring Shared Cluster Partitions
shared disk storage
  configuring, Configuring Shared Disk Storage
shared disk storage hardware table, Cluster Hardware Components
shared partitions
  testing, Testing the Shared Partitions
shared state, Red Hat Cluster Manager Overview
shared storage, Configuring Shared Disk Storage
shared storage requirements, Shared Storage Requirements
single-initiator fibre channel interconnect
  setting up, Setting Up a Fibre Channel Interconnect
single-initiator SCSI bus
  setting up, Setting Up a Single-initiator SCSI Bus
software information, supplementary, Supplementary Software Information
software watchdog timers, Configuring the Software Watchdog Timer
sshd service, Configuring Services on the LVS Routers
synchronizing configuration files, Configuring the LVS Routers with Piranha Configuration Tool
syslog, Configuring syslogd Event Logging
syslog event logging
  configuring, Configuring syslogd Event Logging
syslogd, Configuring syslogd Event Logging
System V init, Starting and Stopping the Cluster Software

## T

tables
  availability and data integrity, Minimum Hardware Requirements
  cluster hardware, Cluster Hardware Components
  cluster member hardware, Cluster Hardware Components
  common cluster behaviors, Common Cluster Behaviors: General
  console switch hardware, Cluster Hardware Components
  diagnosing and correcting problems in a cluster, Diagnosing and Correcting Problems in a Cluster
  installing the basic cluster hardware, Installing the Basic Cluster Hardware
  member status, Displaying Cluster and Service Status
  minimum cluster configuration components, Minimum Hardware Requirements
  network hardware, Cluster Hardware Components
  no single point of failure configuration, Minimum Hardware Requirements
  point-to-point Ethernet connection hardware, Cluster Hardware Components
  power controller connection, configuring, Configuring a Power Controller Connection
  power switch hardware, Cluster Hardware Components
  service property and resource information, Gathering Service Information
  service status, Displaying Cluster and Service Status
  shared disk storage hardware, Cluster Hardware Components
  UPS system hardware, Cluster Hardware Components
terminal server, Minimum Hardware Requirements
testing
  power switches, Testing the Power Switches, Using the clufence Utility
  quorum partitions, Using the shutil Utility
  shared partitions, Testing the Shared Partitions
troubleshooting
  diagnosing and correcting problems in a cluster, Diagnosing and Correcting Problems in a Cluster
  failover and recover scenarios, Failover and Recovery Scenarios
  power switch testing, Testing the Power Switches, Using the clufence Utility
  table, Diagnosing and Correcting Problems in a Cluster

## U

UPS system hardware table, Cluster Hardware Components
UPS systems
  configuring, Configuring UPS Systems
using Red Hat GFS with Red Hat Cluster Suite, Using Red Hat GFS with Red Hat Cluster Suite
utilities
  clufence, Using the clufence Utility
  clusvcadm, Using the clusvcadm Utility
  redhat-config-cluster-cmd, Using redhat-config-cluster-cmd
  shutil, Using the shutil Utility

## W

watchdog timers
  hardware
    configuring, Configuring a Hardware Watchdog Timer
  hardware-based, Choosing the Type of Power Controller
  NMI
    enabling, Enabling the NMI Watchdog Timer
  setting up, Setting up Watchdog Power Switches
  software, Configuring the Software Watchdog Timer
    configuration, Configuring the Software Watchdog Timer
  software-based, Choosing the Type of Power Controller
weighted least connections
  See job scheduling, LVS
weighted round robin
  See job scheduling, LVS

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