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Oracle Tips by Burleson |
Oracle Disk I/O Tuning
Chapter 5:
Configuration of CFS or Raw Devices
Configure Veritas CFS for Solaris and HP platforms
Another
option available for Solaris and HP platform is the use of Veritas
Advance Cluster solution, which provides comprehensive cluster
software and shared storage solutions. In this section, we will
examine the shared storage solution in terms of the Veritas cluster
file system (CFS)
Setting up
volumes and making sure the cluster file system is accessible by all
nodes configures the shared storage. In sum the volumes and the CFS
depend on the physical storage. The cluster volume manager manages
all related objects such as physical disks (LUNS), disk groups,
volumes, and file systems. Oracle uses the ODM (Oracle disk manager)
interface to communicate with Veritas volumes and CFS files.
Cluster
Volume Manager (CVM)
CVM is basically an
extension of the widely used Veritas Volume Manager. CVM extends the
functionality of the VxVM to all the nodes in the cluster. Each node
sees the same state of all volume resources. It follows master/slave
architecture. One node usually acts as master and others as slaves.
There is only one master in a given cluster. The volume manager
daemon (vxconfigd) maintains the configuration of the logical
volumes. Each node in the node has the vxconfigd daemon. Changes to
a volume are propagated first to the master daemon and then the
master passes it on to slave daemons. These changes happen at kernel
level.
The above text is
an excerpt from:
Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle
Databases
ISBN
0-9745993-4-4
by Mike Ault
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