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HP serviceguard t2808-90006 manual 96

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Disaster Scenarios and Their Handling

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Chapter 4

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HP Serviceguard Extended Distance Cluster for Linux A.01.00 Deployment Guide Page Contents 1. Disaster Tolerance and Recovery in a Serviceguard Cluster 2.Building an Extended Distance Cluster Using Serviceguard and Software RAID 3. Configuring your Environment for Software RAID 4. Disaster Scenarios and Their Handling A. Managing an MD Device Page Page Table Editions and Releases NOTE Page Intended Audience Document Organization Page Related Publications • http://www.hp.com/go/ha Problem Reporting Page Disaster Tolerance and Recovery in a Serviceguard Cluster Evaluating the Need for Disaster Tolerance Evaluating the Need for Disaster Tolerance Disaster tolerance disaster Page What is a Disaster Tolerant Architecture What is a Disaster Tolerant Architecture Figure High Availability Architecture pkg B Client Connections multiple points of failure (MPOF) data center disaster tolerant architecture Disaster Tolerant Architecture Extended Distance Clusters campus clusters Extended Distance Cluster Two Data Center Setup Benefits of Extended Distance Cluster Cluster Extension (CLX) Cluster CLX for Linux Serviceguard Cluster Benefits of CLX Differences Between Extended Distance Cluster and CLX Continental Cluster Continental Cluster Los Angeles Cluster: WAN New York Cluster: Data Center A Benefits of Continentalclusters Continental Cluster With Cascading Failover Comparison of Disaster Tolerant Solutions Comparison of Disaster Tolerant Cluster Solutions Attributes Extended Distance CLX Continentalclusters Comparison of Disaster Tolerant Cluster Solutions (Continued) Page Page Page Page Protecting Nodes through Geographic Dispersion Protecting Data through Replication On-lineData Replication Synchronous replication Asynchronous 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 Network Logical Replication in Software No direct access to both copies of data Using Alternative Power Sources Creating Highly Available Networking Disaster Tolerant Local Area Networking Disaster Tolerant Wide Area Networking Disaster Tolerant Cluster Limitations Managing a Disaster Tolerant Environment Managing a Disaster Tolerant Environment Page Additional Disaster Tolerant Solutions Information Additional Disaster Tolerant Solutions Information Building an Extended Distance Cluster Using Serviceguard and Software RAID Types of Data Link for Storage and Networking Types of Data Link for Storage and Networking Link Technologies and Distances Type of Link Two Data Center and Quorum Service Location Architectures Two Data Center and Quorum Service Location Architectures Page Two Data Centers and Third Location with DWDM and Quorum Server Page Rules for Separate Network and Data Links Rules for Separate Network and Data Links Guidelines on DWDM Links for Network and Data Guidelines on DWDM Links for Network and Data Page Page Configuring your Environment for Software RAID Understanding Software RAID Understanding Software RAID http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html Supported Operating Systems Prerequisites Installing XDC Verifying the XDC Installation Page Configuring the Environment Configuring the Environment IMPORTANT Page Setting the Value of the Link Down Timeout Parameter http://download.qlogic.com/manual/32338/SN0054614-00B.pdf Cluster Reformation Time and Timeout Values Heartbeat Link Down Intervals Using Persistent Device Names Using Persistent Device Names To Create and Assemble an MD Device #mdadm -A -R /dev/md0 /dev/hpdev/sde1 /dev/hpdev/sdf1 #mdadm -S /dev/md0 Creating Volume Groups and Configuring VG Exclusive Activation on the MD Mirror Creating Volume Groups and Configuring VG Exclusive Activation on the MD Mirror http://docs.hp.com/en/ha.html#Serviceguard for Linux Configuring the Package Control Script and RAID Configuration File Creating and Editing the Package Control Scripts Editing the raid.conf File Cases to Consider when Setting RPO_TARGET RPO Target Definitions Page Page Page Page Disaster Scenarios and Their Handling Disaster Scenarios and Their Handling Disaster Scenarios and Their Handling (Continued) NOTE: Page Page Page Page Page IMPORTANT: Page Page A Managing an MD Device Viewing the Status of the MD Device Viewing the Status of the MD Device cat /proc/mdstat Stopping the MD Device Stopping the MD Device # mdadm -S<md_device name Example A-1Stopping the MD Device /dev/md0 [root@dlhct1 dev]# mdadm -S /dev/md0 Starting the MD Device Starting the MD Device # mdadm -A -R<md_device_name Example A-2Starting the MD Device /dev/md0 # mdadm -A -R /dev/md0 /dev/hpdev/sde /dev/hpdev/sdf1 Removing and Adding an MD Mirror Component Disk Removing and Adding an MD Mirror Component Disk # udevinfo -qsymlink -nsdc1 # mdadm --remove /dev/md0 /dev/hpdev/mylink-sdc1 Adding a Mirror Component Device Index

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