The problem may be in how you have formatted the ocfs file system.
When you format an ocfs2 file system you can specify the maximum number of node slots. This limits the maximum number of nodes that can mount the filesystem.
This extract is from the manual page for mkfs.ocfs2 which is used to format the ocfs2 file systems.
Quote:
-N number-of-node-slots
Valid number ranges from 1 to 255. This number specifies the maximum number of nodes that can concurrently
mount the partition. If omitted, the number defaults to 4. This number can be later increased using
tunefs.ocfs2.
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As stated you can use tunefs.ocfs2 to increase the number of slots available on the file system assuming this is the cause of your problem.
Before running the command you will need to ensure the file system is unmounted on all nodes.
You only need to run the tune2fs command on one of the nodes.
tunefs.ocfs2 -N 3 /dev/mapper/voting1
Would increase the number of node slots to 3 on /dev/mapper/voting1