HP-UX and Linux Serviceguard Cluster Manageability, June 2007
Table Of Contents
- Purpose
- Audience
- Executive summary
- HP management solutions
- Achieving end-to-end management with HP System Management Homepage, HP Serviceguard Manager, HP Systems Insight Manager, and HP Operations Manager software
- Better together: Complementary management delivering the best return on IT
- Differences between HP Serviceguard Manager stand-alone and functional area versions
- HP Serviceguard Manager integration with HP Systems Insight Manager
- HP Serviceguard Manager integration with HP Network Node Manager
- HP Serviceguard Manager integration with HP Operations Manager
- Example
- Usage scenarios
- Statement on future direction
- Summary
- Appendix A
- For more information
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• HP Serviceguard Extended Distance Cluster for Linux—HP Serviceguard XDC for Linux is disaster
tolerant clustering software that extends a Serviceguard for Linux cluster up to 100 kilometers.
In doing so, XDC protects against site failures, provides business continuity, and enhances the level
of protection against data corruption. XDC enables automatic, bidirectional failover of business-
critical data and applications, utilizing the Multi-Device (MD) software RAID driver for data
replication. It is storage array independent, supporting all Fibre Channel storage compatible with
Serviceguard for Linux.
• HP StorageWorks Cluster Extension EVA— Together, HP Serviceguard for Linux and HP
StorageWorks Cluster Extension EVA offer a cost-effective disaster recovery solution with automatic
site failover over metropolitan-wide distances. It is designed to protect business operations from
major interruptions that affect the entire data center and allow for rapid recovery times in the event
of a failure. Cluster Extension EVA extends a Serviceguard for Linux cluster up to 500 kilometers
within EVA disk array environments.
• HP StorageWorks Cluster Extension XP— HP Serviceguard for Linux and HP StorageWorks Cluster
Extension XP work together to offer a cost-effective disaster recovery solution with automatic site
failover over metropolitan-wide distances. It isdesigned to protect business operations from major
interruptions that affect the entire data center and allow for rapid recovery times in the event of a
failure. Cluster Extension XP extends a Serviceguard for Linux cluster to unlimited distances within
XP disk array environments.
HP Serviceguard Manager
With Serviceguard Manager, the HP cluster-management product, administrators can configure,
monitor, and manage Serviceguard on HP-UX and Linux clusters from any single point, including a
web-based interface. Serviceguard Manager is integrated with HP HP SIM and HP Operations
Manager, providing a comprehensive management solution for all your hardware and software.
HP Serviceguard Quorum Server (HP-UX and Linux)
Serviceguard Quorum Server (QS) is a complementary product of Serviceguard and provides
arbitration services for Serviceguard clusters when a cluster partition is discovered. Should equal-
sized groups of nodes become separated from each other, the quorum server allows one group to
achieve quorum and form the cluster, while the other group is denied quorum and cannot start a
cluster.
For example, if a node cannot reach another node in the cluster, it will attempt to reform the cluster
without the other node. If the nodes are all running but cannot communicate, a quorum count is taken
to determine who should take over the work of the cluster. If one group of nodes has more than 50%
of the original cluster membership, that group will become the new cluster. However, if the cluster
splits into two equal parts, a cluster lock is needed to break the tie and prevent a “split-brain” cluster
in which two different incarnations of an application try to do the same work and access the same
disks.