Description of Oracle Database SQL code: crsctl query css votedisk

This page explains the crsctl query css votedisk command, its purpose, breakdown, and key points, offering insights and explanations for Oracle Clusterware management.

Sample SQL Command

1crsctl query css votedisk

Description of Oracle Database SQL code: crsctl query css votedisk

This code is not actually SQL syntax, but rather a command from the crsctl utility used to manage Oracle Clusterware. However, it interacts with the cluster registry which relies on an underlying database, so I can still offer insights and explanations.

Purpose:

This command retrieves information about the voting disks used by the Oracle Clusterware to determine cluster membership and quorum. Understanding the location and status of these disks is crucial for maintaining cluster health and preventing downtime.

Breakdown:

• crsctl: The Clusterware Resource Control utility used to manage various aspects of the cluster.
• query: Specifies that we want to retrieve information.
• css: Refers to the Cluster Synchronization Services, which handle node membership and communication.
• votedisk: Specifies that we are interested in information about the voting disks.

Output:

The command typically displays the following information for each voting disk:

• STATE: Whether the disk is online or offline.
• File Universal Id: A unique identifier for the voting file.
• File Name: The actual name of the voting file, including its location.
• Disk group: If the voting file is stored in an Oracle ASM disk group, its name will be displayed here.

Key points:

• Voting disks are critical for cluster functionality. If a disk fails, the cluster may lose quorum and become unavailable.
• It is important to have multiple voting disks spread across different nodes to ensure redundancy and availability.
• This command can be used to verify the health and location of voting disks, which can be helpful for troubleshooting cluster issues.

Insights and explanations:

• The location of voting disks can be important for performance and disaster recovery considerations. Ideally, they should be placed on separate physical disks and storage controllers to minimize risks.
• Monitoring the status of voting disks is essential for proactive cluster maintenance. Regularly checking their health can help identify potential issues before they impact cluster stability.
• This command is commonly used by Oracle database administrators and system administrators responsible for managing clustered environments.

Additional notes:

• This explanation assumes a basic understanding of Oracle Clusterware concepts. If you are unfamiliar with these, further research might be helpful.
• The specific output format and details displayed by the command may vary depending on your Oracle Clusterware version and configuration.