HP Serviceguard Extended Distance Cluster for Linux A.01.00 Deployment Guide Manufacturing Part Number: T2808-90006May 2008 Second Edition

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Managing an MD DeviceStarting the MD DeviceAppendix A100Starting the MD DeviceAfter you create an MD device, you would need to stop and start the MD d

Managing an MD DeviceRemoving and Adding an MD Mirror Component DiskAppendix A 101Removing and Adding an MD Mirror Component DiskThere are certain fai

Managing an MD DeviceRemoving and Adding an MD Mirror Component DiskAppendix A102Example A-3 Removing a failed MD component disk from /dev/md0 arrayTo

Index103Aasynchronous data replication, 39Cclusterextended distance, 22FibreChannel, 52metropolitan, 23wide area, 27cluster maintenance, 49configuring

Index104persistent device names, 66physical data replication, 39power sourcesredundant, 44QQLogic cards, 70RRAID Monitoring ServiceConfigure, 78raid.c

11PrefaceRelated PublicationsThe following documents contain additional useful information:• Clusters for High Availability: a Primer of HP Solution

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Disaster Tolerance and Recovery in a Serviceguard ClusterChapter 1 131 Disaster Tolerance and Recovery in a Serviceguard ClusterThis chapter introduce

Disaster Tolerance and Recovery in a Serviceguard ClusterEvaluating the Need for Disaster ToleranceChapter 114Evaluating the Need for Disaster Toleran

Disaster Tolerance and Recovery in a Serviceguard ClusterEvaluating the Need for Disaster ToleranceChapter 1 15line inoperable as well as the computer

Disaster Tolerance and Recovery in a Serviceguard ClusterWhat is a Disaster Tolerant Architecture?Chapter 116What is a Disaster Tolerant Architecture?

Disaster Tolerance and Recovery in a Serviceguard ClusterWhat is a Disaster Tolerant Architecture?Chapter 1 17impact. For these types of installations

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 118Understanding Types of Disaster T

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 19architecture are followed. Exten

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Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 120Figure 1-3 Extended Distance Clus

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 21Figure 1-4 Two Data Center Setup

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 122Also note that the networking in

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 23Cluster Extension (CLX) ClusterA

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 124Figure 1-5 shows a CLX for a Linu

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 25Benefits of CLX• CLX offers a mo

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 126• Disk resynchronization is indep

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 27"objective" can be set

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 128Figure 1-6 Continental Cluster Co

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 29Benefits of Continentalclusters•

3Contents1. Disaster Tolerance and Recovery in a Serviceguard ClusterEvaluating the Need for Disaster Tolerance . . . . . . . . . . . . . . . . . . .

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 130replicate the data between two da

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 31Table 1-1 Comparison of Disaster

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 132Key LimitationNo ability to check

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 33Maximum Distance100 Kilometers S

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 134Application Failover typeAutomati

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 1 35Data Replication LinkDark Fiber

Disaster Tolerance and Recovery in a Serviceguard ClusterUnderstanding Types of Disaster Tolerant ClustersChapter 136DTS Software/Licenses RequiredSGL

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 1 37Disaster Tolerant Architecture Guideline

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 138Protecting Data through ReplicationThe mo

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 1 39depending on the volume of data. Some ap

Contents4Creating a Multiple Disk Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72To Create and Assembl

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 140Figure 1-7 Physical Data Replication MD S

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 1 41• The logical order of data writes is no

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 142• Because there are multiple read devices

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 1 43Figure 1-8 Logical Data Replication Adva

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 144• If the primary database fails and is co

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 1 45Figure 1-9 Alternative Power Sources Hou

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 146Disaster Tolerant Local Area NetworkingEt

Disaster Tolerance and Recovery in a Serviceguard ClusterDisaster Tolerant Architecture GuidelinesChapter 1 47Disaster Tolerant Cluster LimitationsDis

Disaster Tolerance and Recovery in a Serviceguard ClusterManaging a Disaster Tolerant EnvironmentChapter 148Managing a Disaster Tolerant EnvironmentIn

Disaster Tolerance and Recovery in a Serviceguard ClusterManaging a Disaster Tolerant EnvironmentChapter 1 49Even if recovery is automated, you may ch

5Contents

Disaster Tolerance and Recovery in a Serviceguard ClusterAdditional Disaster Tolerant Solutions InformationChapter 150Additional Disaster Tolerant Sol

Building an Extended Distance Cluster Using Serviceguard and Software RAIDChapter 2 512 Building an Extended Distance Cluster Using Serviceguard and S

Building an Extended Distance Cluster Using Serviceguard and Software RAIDTypes of Data Link for Storage and NetworkingChapter 252Types of Data Link f

Building an Extended Distance Cluster Using Serviceguard and Software RAIDTwo Data Center and Quorum Service Location ArchitecturesChapter 2 53Two Dat

Building an Extended Distance Cluster Using Serviceguard and Software RAIDTwo Data Center and Quorum Service Location ArchitecturesChapter 254• Fibre

Building an Extended Distance Cluster Using Serviceguard and Software RAIDTwo Data Center and Quorum Service Location ArchitecturesChapter 2 55Figure

Building an Extended Distance Cluster Using Serviceguard and Software RAIDTwo Data Center and Quorum Service Location ArchitecturesChapter 256There ar

Building an Extended Distance Cluster Using Serviceguard and Software RAIDRules for Separate Network and Data LinksChapter 2 57Rules for Separate Netw

Building an Extended Distance Cluster Using Serviceguard and Software RAIDGuidelines on DWDM Links for Network and DataChapter 258Guidelines on DWDM L

Building an Extended Distance Cluster Using Serviceguard and Software RAIDGuidelines on DWDM Links for Network and DataChapter 2 59• Fibre Channel swi

Contents6

Building an Extended Distance Cluster Using Serviceguard and Software RAIDGuidelines on DWDM Links for Network and DataChapter 260

Configuring your Environment for Software RAIDChapter 3 613 Configuring your Environment for Software RAIDThe previous chapters discussed conceptual i

Configuring your Environment for Software RAIDUnderstanding Software RAIDChapter 362Understanding Software RAIDRedundant Array of Independent Disks (R

Configuring your Environment for Software RAIDInstalling the Extended Distance Cluster SoftwareChapter 3 63Installing the Extended Distance Cluster So

Configuring your Environment for Software RAIDInstalling the Extended Distance Cluster SoftwareChapter 364Complete the following procedure to install

Configuring your Environment for Software RAIDInstalling the Extended Distance Cluster SoftwareChapter 3 65In the output, the product name, xdc -A.01.

Configuring your Environment for Software RAIDConfiguring the EnvironmentChapter 366Configuring the EnvironmentAfter setting up the hardware as descri

Configuring your Environment for Software RAIDConfiguring the EnvironmentChapter 3 67that are of identical sizes. Differences in disk set size results

Configuring your Environment for Software RAIDConfiguring the EnvironmentChapter 368• Ensure that the Quorum Server link is close to the Ethernet link

Configuring your Environment for Software RAIDConfiguring Multiple Paths to StorageChapter 3 69Configuring Multiple Paths to StorageHP requires that y

7Printing History The printing date and part number indicate the current edition. The printing date changes when a new edition is printed. (Minor co

Configuring your Environment for Software RAIDConfiguring Multiple Paths to StorageChapter 370The QLogic cards are configured to hold up any disk acce

Configuring your Environment for Software RAIDUsing Persistent Device NamesChapter 3 71Using Persistent Device NamesWhen there is a disk related failu

Configuring your Environment for Software RAIDCreating a Multiple Disk DeviceChapter 372Creating a Multiple Disk DeviceAs mentioned earlier, the first

Configuring your Environment for Software RAIDCreating a Multiple Disk DeviceChapter 3 732. Assemble the MD device on the other node by running the fo

Configuring your Environment for Software RAIDCreating Volume Groups and Configuring VG Exclusive Activation on the MD MirrorChapter 374Creating Volum

Configuring your Environment for Software RAIDCreating Volume Groups and Configuring VG Exclusive Activation on the MD MirrorChapter 3 75Found duplica

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 376Configuring the Package Con

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 3 77# Specify the method of ac

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 378To Edit the XDC_CONFIG FILE

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 3 79more time elapses than wha

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Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 380For example, let us assume

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 3 81Now consider an XDC config

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 382Again, if the network is se

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 3 83• RAID_MONITOR_INTERVALThi

Configuring your Environment for Software RAIDConfiguring the Package Control Script and RAID Configuration FileChapter 384

Disaster Scenarios and Their HandlingChapter 4 854 Disaster Scenarios and Their HandlingThe previous chapters provided information on deploying Softwa

Disaster Scenarios and Their HandlingChapter 486The following table lists all the disaster scenarios that are handled by the Extended Distance Cluster

Disaster Scenarios and Their HandlingChapter 4 87A package (P1) is running on a node (Node 1). The package uses a mirror (md0) that consists of two st

Disaster Scenarios and Their HandlingChapter 488A package (P1) is running on a node (Node 1). The package uses a mirror (md0) that consists of two sto

Disaster Scenarios and Their HandlingChapter 4 89This is a multiple failure scenario where the failures occur in a particular sequence in the configur

9PrefaceThis guide introduces the concept of Extended Distance Clusters (XDC). It describes how to configure and manage HP Serviceguard Extended Dis

Disaster Scenarios and Their HandlingChapter 490This is a multiple failure scenario where the failures occur in a particular sequence in the configura

Disaster Scenarios and Their HandlingChapter 4 91This failure is the same as the previous failure except that the package (P1) is configured with RPO_

Disaster Scenarios and Their HandlingChapter 492In this case, the package (P1) runs with RPO_TARGET set to 60 seconds.Package P1 is running on node N1

Disaster Scenarios and Their HandlingChapter 4 93This scenario is an extension of the previous failure scenario. In the previous scenario, when the pa

Disaster Scenarios and Their HandlingChapter 494In this case, the package (P1) runs with RPO-TARGET set to 60 seconds.In this case, initially the pack

Disaster Scenarios and Their HandlingChapter 4 95In this case, initially the package (P1) is running on node N1. P1 uses a mirror md0 consisting of S1

Disaster Scenarios and Their HandlingChapter 496

Managing an MD DeviceAppendix A 97A Managing an MD DeviceThis chapter includes additional information on how to manage the MD device. For the latest i

Managing an MD DeviceViewing the Status of the MD DeviceAppendix A98Viewing the Status of the MD Device After creating an MD device, you can view its

Managing an MD DeviceStopping the MD DeviceAppendix A 99Stopping the MD DeviceAfter you create an MD device, it begins to run. You need to stop the de