Troubleshooting an Issue With Oracle RAC

Problem: If you use Oracle RAC with Solaris Volume Manager for shared file systems, you might see a message that volumes are not available.

Solution: In response to this issue, you can configure the rac_maxdevretry parameter in the /etc/opt/SUNWsamfs/defaults.conf file. By default, the rac_maxdevretry variable is set to 150 (5 minutes).

The items to take in account for adjusting this variable include:

• Number of nodes in the cluster

• Number of physical LUNs

• Number of Solaris Volume Manager disk groups

• Speed of array topology 1G/2G/4G

In the following example /etc/opt/SUNWsamfs/defaults.conf file, the time is shortened to 90 seconds (3 minutes).

trace
all = on
sam-sharefsd.options = all
sam-fsd.size = 10M
sam-sharefsd.size = 10M
endtrace
rac_maxdevretry = 90

This change was based on the following environment:

• Nodes - 8

• Physical LUNs - 32 Shared Physical LUNS with 4G Fibre Channel

• Solaris Volume Manager disk groups - 1

• Shared file systems - 13

An example of this setting is included in the /etc/opt/SUNWsamfs/examples/defaults.conf file.

For more information about configuring an Oracle database, see Oracle Solaris Cluster Data Service for Oracle Real Application Clusters.