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Hodnocené. / 5. Na základě hodnocení zákazníků
<fence>
</fence>
</clusternode>
</clusternodes>
<fencedevices>
</fencedevices>
<rm>
</rm>
<cluster>
In this example, the fourth line of the configuration (annotated as " INVALID " here) contains an
invalid value for the XML attribute, no d ei d in the cl usternod e line for no d e-
0 1. example. co m. The value is a negative value ("-1") instead of a positive value ("1"). For the
no d ei d attribute, the value must be a positive value.
2.8. Considerat ions for Net workManager
The use of Net wo rkMan ag er is not supported on cluster nodes. If you have installed
Net wo rkMan ag er on your cluster nodes, you should either remove it or disable it.
Note
The cman service will not start if NetworkManager is either running or has been configured to
run with the chkconfi g command.
2.9. Considerat ions for Using Quorum Disk
Quorum Disk is a disk-based quorum daemon, q d i skd , that provides supplemental heuristics to
determine node fitness. With heuristics you can determine factors that are important to the operation
of the node in the event of a network partition. For example, in a four-node cluster with a 3:1 split,
ordinarily, the three nodes automatically " win" because of the three-to-one majority. Under those
circumstances, the one node is fenced. With q d i skd however, you can set up heuristics that allow
the one node to win based on access to a critical resource (for example, a critical network path). If
your cluster requires additional methods of determining node health, then you should configure
q d i skd to meet those needs.
Note
Configuring q d i skd is not required unless you have special requirements for node health. An
example of a special requirement is an "all-but-one" configuration. In an all-but-one
configuration, q d i skd is configured to provide enough quorum votes to maintain quorum
even though only one node is working.
Red Hat Ent erprise Linux 6 Clust er Administ rat ion
32
- Red Hat Enterprise Linux 6 1
- Cluster Administration 1
- Legal Notice 4
- Abstract 4
- Table of Contents 5
- Introduction 10
- In t rod uct io n 11
- 1.2. Pull-quot e Convent ions 12
- 1.3. Not es and Warnings 12
- 2. Feedback 13
- Management Overview 14
- 2.2. Compat ible Hardware 24
- 2.3. Enabling IP Port s 24
- 2.11. Mult icast Addresses 38
- 2.12. UDP Unicast Traffic 38
- 3.1. Configurat ion T asks 40
- 3.2. St art ing luci 41
- 3.4 . Creat ing a Clust er 44
- 3.5.6. Logging Configurat ion 50
- 4.3. Managing Clust er Nodes 65
- 5.1. Operat ional Overview 72
- 5.2. Configurat ion T asks 74
- 5.3. St art ing ricci 75
- 5.14 .4 . Logging 103
- 6.1. Managing Clust er Nodes 106
- Important 108
- 7.1. Configurat ion T asks 109
- Basic Configuration Examples 111
- 7.3. Configuring Fencing 113
- 7.5. Configuring HA Services 122
- Command Line Tools 134
- 9.2. Clust er Does Not Form 155
- 9.4 . Clust er Daemon crashes 156
- 9.5. Clust er Services Hang 158
- Availability Add-On 161
- 10.3. Forwarding SNMP t raps 162
- 11.1. CT DB Overview 165
- 11.2. Required Packages 165
- 11.3. GFS2 Configurat ion 165
- 11.4. CT DB Configurat ion 167
- 11.5. Samba Configurat ion 169
- Fence Device Parameters 172
- Fence Device Paramet ers 173
- HA Resource Parameters 195
- HA Resource Paramet ers 197
- HA Resource Behavior 210
- Command Line Tools Summary 222
- Revision History 227
- Revision Hist o ry 229
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