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Oracle Tips by Burleson |
Oracle10g Grid Computing
with RAC
Chapter 5 -
Preparing Shared Storage
Context Dependent Symbolic Link (CDSL)
Node-specific Oracle files like tnsnames.ora,
listener.ora, and sqlnet.ora can also be created using the CDSL
system. CDSL(s) contain a variable whose value is determined only
during pathname resolution. The {memb} variable is used to access
member-specific files in a cluster.
The following example shows the CDSL for /etc/rc.config:
/etc/rc.config
-> ../cluster/members/{memb}/etc/rc.config
When resolving a CDSL pathname, the kernel
replaces the {memb} variable with the string membern, where n is the
member ID of the current member.
CDSL(s) are useful when running multiple
instances of an application on different cluster members, where each
member operates on a different set of data. The mkcdsl command lets
system administrators create CDSL(s) and update a CDSL inventory
file. The cdslinvchk command verifies the current CDSL inventory.
Oracle Cluster File System (OCFS)
Oracle Cluster File System (OCFS) is a shared
file system designed specifically for Oracle Real Application
Clusters. OCFS eliminates the requirement for Oracle database files
to be located on the raw devices in Linux RAC cluster and Windows
RAC cluster.
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
Oracle Consulting
Services
Burleson
Oracle Consulting offers Senior Oracle consultants which are available for all
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For more
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info@remote-dba.net.
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