Consolidating HP Serviceguard for Linux and Oracle RAC 10g Clusters, June 2005

ManualsBrandsHP ManualsSoftwareHP Serviceguard for Linux License Kit

Consolidating HP Serviceguard for Linux and Oracle RAC

10g Clusters

Executive Summary...................................................................... 2

Introduction ................................................................................ 2

Audience ................................................................................. 3

Consolidating HP Serviceguard for Linux and Oracle RAC 10g Clusters

................................................................................................. 3

Background.............................................................................. 3

Dual Cluster Co-existence........................................................... 3

Recommended Configuration........................................................ 4

Clusters with more than two nodes .............................................. 6

Conclusion ................................................................................. 6

Related Materials ........................................................................ 7

Summary of content (7 pages)

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Consolidating HP Serviceguard for Linux and Oracle RAC 10g Clusters Executive Summary...................................................................... 2 Introduction ................................................................................ 2 Audience ................................................................................. 3 Consolidating HP Serviceguard for Linux and Oracle RAC 10g Clusters ................................................................................................
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Executive Summary Oracle Real Application Clusters (RAC) 10g Release1 database server includes a clustering solution that supports Oracle database servers in a highly available environment. Although this feature eliminates the requirement for a third-party cluster product for the database, additional components are needed to provide high availability for applications to run on the same servers that are part of the RAC cluster.
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In an Oracle 10g R1 RAC on Linux environment, only configurations leveraging Serviceguard for Linux as the failover cluster solution for applications other than the Oracle database will be supported by HP. Audience This document is for users of Serviceguard on Linux who are interested in providing high availability encapsulation to applications which would run on the same servers as an Oracle 10g R1 RAC cluster.
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heartbeat mechanisms. Heartbeats are network messages that are sent between nodes in a cluster letting each node know that the others are “alive”. Both Serviceguard for Linux and Oracle RAC recognize node failures by the loss of heartbeats and act to resolve it by rebooting the affected node. Most failures where there is a loss of heartbeat are due to a node failure. This could be due to a hardware problem or an OS crash.
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Figure 1 is an example of the network configuration for a two node consolidated cluster. It has two bonded network pairs. One dedicated to the HP Serviceguard for Linux and Oracle heartbeats. The other for communication external to the cluster and also for HP Serviceguard for Linux heartbeats. This is the minimum supported. Dual port NICs can be used, but for availability, bonded pairs should NOT use the connections from a single dual port NIC. More NICs can be added at the users’ option.
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Some extra care needs to be taken when administering the clusters. For example, if an administrator halts only HP Serviceguard for Linux on a node and does not halt CRS (RAC) on the same node, then a subsequent network partition may result in Serviceguard for Linux and the applications it is protecting becoming entirely unavailable. This would happen in case where the only remaining Serviceguard for Linux node is chosen to be rebooted by Oracle as a result of the network partition.
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Related Materials “Oracle 10g Sales Guide” at http://oracle.hp.com/products/products.cfm?Product=oracle_10g “Oracle 10g Cluster Ready Services Positioning White Paper” at http://csps.fc.hp.com/ha/oracle/10g/10gRAC_on_hp_general.htm HP Serviceguard product documentation at http://docs.hp.