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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 6 - Install, Configure and Database Creation

General Parallel File System - GPFS

Figure 6.16 AIX Cluster Environment

A GPFS cluster in an HACMP environment is formed by a group of RS/6000 and IBM pSeries machines taking part in an HACMP/ES cluster. In this environment, every node in the GPFS cluster must be connected to the disks through their physical attachment so that each disk is available to all nodes for concurrent access 

GPFS operates under the HACMP/ES cluster environment. HACMP/ES provides the logical volume manager (LVM) subsystem. GPFS administrative scripts to each node in the cluster vary - on the volume groups containing the GPFS data - at proper times for file system operations. This GPFS operation is done without locking the disks that make up the volume group using the varyonvg command with the -u flag.

Disks for a GPFS file system now support both SSA and fiber channel attachment. Once the file system is created, it can be automatically mounted whenever the GPFS daemon is started. The auto-mount feature assures that whenever the system and disks are up, the file system will be available.

The Concurrent Logical Volume Manager (CLVM) component of AIX is not required for a GPFS cluster in a HACMP environment. The GPFS kernel extension provides the interfaces to the operating system VNODE and virtual file system (VFS) interfaces for adding a file system. Structurally, applications make file system calls to the operating system, which presents them to the GPFS file system kernel extension. In this way, GPFS appears to applications as just another file system.

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma


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