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HP serviceguard t2808-90006 manual Guidelines on Dwdm Links for Network and Data Chapter

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Install Configuring your Environment Two Data Center Setup #RAIDTAB= # MD RAID Commands Recovery Process Alternative Power Sources Using Persistent Device Names

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Building an Extended Distance Cluster Using Serviceguard and Software RAID

Guidelines on DWDM Links for Network and Data

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HP serviceguard t2808-90006 manual Guidelines on Dwdm Links for Network and Data Chapter

Page 59 Page 61

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Contents

Page Legal Notices Contents Disaster Scenarios and Their Handling Managing an MD Device Contents Contents Printing History Editions and Releases HP Printing Division Intended Audience Document OrganizationPage Related Page Disaster Tolerance Evaluating the Need for Disaster Tolerance Evaluating the Need for Disaster Tolerance What is a Disaster Tolerant Architecture? High Availability ArchitectureNode 1 fails Pkg B Client Connections Disaster Tolerant Architecture Understanding Types of Disaster Tolerant Clusters Extended Distance Clusters From both storage devices Extended Distance Cluster Two Data Center Setup Benefits of Extended Distance Cluster Cluster Extension CLX Cluster Shows a CLX for a Linux Serviceguard cluster architecture CLX for Linux Serviceguard Cluster Benefits of CLX Differences Between Extended Distance Cluster and CLX Continental Cluster Los Angeles Cluster New York ClusterData Cent er a Data Center B Continental Cluster Benefits of Continentalclusters Comparison of Disaster Tolerant Solutions Continental Cluster With Cascading Failover Comparison of Disaster Tolerant Cluster Solutions Attributes Extended DistanceContinentalclusters Cluster HP-UX only Understanding Types of Disaster Tolerant Clusters Understanding Types of Disaster Tolerant Clusters Understanding Types of Disaster Tolerant Clusters WAN EVA Disaster Tolerant Architecture Guidelines Protecting Nodes through Geographic Dispersion Protecting Data through Replication Off-line Data Replication On-line Data Replication Physical Data Replication Advantages of physical replication in hardware are Disadvantages of physical replication in hardware are Advantages of physical replication in software are Disadvantages of physical replication in software are Logical Data Replication Disadvantages of logical replication are Using Alternative Power Sources Ideal Data Replication Alternative Power Sources Power Circuit 1 nodeData Center a Node 3 Power Circuit Creating Highly Available Networking Disaster Tolerant Local Area Networking Disaster Tolerant Wide Area Networking Disaster Tolerant Cluster Limitations Manage it in-house, or hire a service? Managing a Disaster Tolerant Environment How is the cluster maintained? Additional Disaster Tolerant Solutions Information Building an Extended Distance Types of Data Link for Storage Networking Dwdm Two Data Center and Quorum Service Location Architectures Two Data Center and Quorum Service Location Architectures Two Data Centers and Third Location with Dwdm and Quorum Server Two Data Center and Quorum Service Location Architectures Rules for Separate Network and Data Links Guidelines on Dwdm Links for Network and Data Guidelines on Dwdm Links for Network and Data Guidelines on Dwdm Links for Network and Data Chapter Configuring your Environment Understanding Software RAID Installing the Extended Distance Cluster Software Installing XDCSupported Operating Systems Prerequisites Verifying the XDC Installation # rpm -Uvh xdc-A.01.00-0.rhel4.noarch.rpm Installing the Extended Distance Cluster Software Configuring the Environment Configuring the Environment Configuring the Environment Configuring Multiple Paths to Storage Setting the Value of the Link Down Timeout Parameter Cluster Reformation Time and Timeout Values Using Persistent Device Names Http//docs.hp.com Creating a Multiple Disk Device To Create and Assemble an MD Device # mdadm -A -R /dev/md0 /dev/hpdev/sde1 /dev/hpdev/sdf1 Chapter Linux #RAIDTAB= # MD RAID Commands Creating and Editing the Package Control Scripts To Create a Package Control ScriptTo Edit the Datarep Variable To Edit the Xdcconfig File parameter To Configure the RAID Monitoring ServiceEditing the raid.conf File Cases to Consider when Setting Rpotarget RPO Target Definitions Chapter Multipledevices and Componentdevices Raidmonitorinterval Configuring your Environment for Software RAID What happens when this disaster occurs Recovery ProcessDisaster Scenario Disaster Scenarios and Their Handling Disaster Scenarios and Their Handling # mdadm --remove /dev/md0 # mdadm -add /dev/md0 Dev/hpdev/mylink-sdf P1 uses a mirror md0 Run the following command to S2 is non-current by less # cmrunpkg packagename Execute the commands that With md0 consisting of only N1, for example Becomes accessible from N2 Center Disaster Scenarios and Their Handling Managing an MD Device Viewing the Status of the MD Device Cat /proc/mdstat Stopping the MD Device Example A-1 Stopping the MD Device /dev/md0 Starting the MD Device Example A-2 Starting the MD Device /dev/md0 Removing and Adding an MD Mirror Component Disk # udevinfo -q symlink -n sdc1 Adding a Mirror Component Device # mdadm --remove /dev/md0 /dev/hpdev/sde Index 104

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