Backing Up and Recovering Voting Disks

Backing Up and Recovering Voting Disks

What is a voting disk & why its needed ?
The voting disk records node membership information. A node must be
able to access more than half of the voting disks at any time.

For example, if you have seven voting disks configured, then a node must
be able to access at least four of the voting disks at any time. If a
node cannot access the minimum required number of voting disks it is evicted, or removed, from the cluster.

Backing Up Voting Disks

When to backup voting disk ?

  1.       After installation
  2.       After adding nodes to or deleting nodes from the cluster
  3.       After performing voting disk add or delete operations

To make a backup copy of the voting disk, use the Linux dd command. Perform this operation on every voting disk as needed where voting_disk_name is the name of the active voting disk and backup_file_name is the name of the file to which you want to back up the voting disk contents:
dd if=voting_disk_name of=backup_file_name

If your voting disk is stored on a raw device, use the device name in place of voting_disk_name. For example:
dd if=/dev/sdd1 of=/tmp/voting.dmp

Note : When you use the dd command for making backups of the voting disk, the backup can be performed while the Cluster Ready Services (CRS) process is active; you do not need to stop the crsd.bin process before taking a backup of the voting disk.

Recovering Voting Disks

If a voting disk is damaged, and no longer usable by Oracle Clusterware, you can recover the voting disk if you have a backup file.

dd if=backup_file_name of=voting_disk_name

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About

This blog is authored by Pankaj Chandiramani , Product Manager for Enterprise Manager at Oracle . Main Focus of the blog will be on Enterprise Manager 12c with deep coverage of Database Center Automation including DbaaS , Database Provisioning , Database Patching , Config , Compliance etc .

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