Behavior of Oracle RAC 11g Release 2 (11.2.0.1) on Storage Foundation for Oracle RAC on Unix and Linux platforms

Article:TECH135605  |  Created: 2010-01-30  |  Updated: 2010-08-12  |  Article URL http://www.symantec.com/docs/TECH135605
Article Type
Technical Solution

Product(s)

Environment

Issue



Behavior of Oracle RAC 11g Release 2 (11.2.0.1) on Storage Foundation for Oracle RAC on Unix and Linux platforms


Solution



Title: Behavior of Oracle RAC 11g Release 2 (11.2.0.1) on SF Oracle RAC on Unix and Linux platforms

Details:
(1) Detection of vendor clusterware by Oracle Grid Infrastructure
On Unix, during Oracle Grid Infrastructure installation, Oracle detects the presence of the vendor clusterware and displays all the SF Oracle RAC cluster nodes on the node selection page.

However on Linux with Oracle RAC 11.2.0.1, Oracle does not detect the presence of vendor clusterware and thus does not display the SF Oracle RAC cluster nodes. Customer has to manually add the SF Oracle RAC cluster nodes on the node selection page before proceeding with the installation.

(2) CSS Misscount setting
On Unix, after Oracle Grid Infrastructure installation, Oracle sets CSS misscount to 600 seconds in presence of the vendor clusterware.

However on Linux by default, the CSS misscount setting is set to 30 seconds in Oracle RAC 11.2.0.1. This is because Oracle RAC 11.2.0.1 does not detect the presence of the vendor clusterware. Oracle RAC requires the CSS misscount value to be set to 600 seconds with vendor clusterware.

Refer to the Certification Notes on the Oracle certification page for Oracle RAC 11.2.0.1, where this is acknowledged by Oracle.


(3) Node numbering discrepancies between Oracle Grid Infrastructure and SF Oracle RAC (Cross platform behavior)

For Oracle RAC 11g Release 2, you will observe that the output of the lsnodes command (used to obtain membership information from SF Oracle RAC) and the olsnodes command (used to obtain membership information from Oracle Grid Infrastructure) differ. Oracle RAC starts the count at 1 while SF Oracle RAC starts the count at 0.

For example, in a two-node cluster:

The lsnodes command produces the following output:
# lsnodes -n
Node1        0
Node2        1
Node3        2
Node4        3


The olsnodes command produces the following output:
# olsnodes -n
Node1        1
Node2        2
Node3        3
Node4        4

In previous Oracle RAC releases (starting with Oracle RAC 10g Release 1), the commands produced the same output unless there were configuration issues in the cluster. Whenever node numbering discrepancies were observed, further issues were seen in the cluster.

However, the discrepancy in node numbering in Oracle RAC 11g Release 2 is conformant with the design change in Oracle Grid Infrastructure. It does not indicate any configuration issues in the cluster.


Products Applied:
Veritas Storage Foundation for Oracle RAC 5.0 with Oracle RAC 11.2.0.1
Veritas Storage Foundation for Oracle RAC 5.1 with Oracle RAC 11.2.0.1

Operating Systems:
AIX, HPUX, Solaris, Linux




Legacy ID



357009


Article URL http://www.symantec.com/docs/TECH135605


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