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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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