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- What: /sys/fs/ocfs2/
- Date: April 2008
- Contact: ocfs2-devel@oss.oracle.com
- Description:
- The /sys/fs/ocfs2 directory contains knobs used by the
- ocfs2-tools to interact with the filesystem.
- What: /sys/fs/ocfs2/max_locking_protocol
- Date: April 2008
- Contact: ocfs2-devel@oss.oracle.com
- Description:
- The /sys/fs/ocfs2/max_locking_protocol file displays version
- of ocfs2 locking supported by the filesystem. This version
- covers how ocfs2 uses distributed locking between cluster
- nodes.
- The protocol version has a major and minor number. Two
- cluster nodes can interoperate if they have an identical
- major number and an overlapping minor number - thus,
- a node with version 1.10 can interoperate with a node
- sporting version 1.8, as long as both use the 1.8 protocol.
- Reading from this file returns a single line, the major
- number and minor number joined by a period, eg "1.10".
- This file is read-only. The value is compiled into the
- driver.
- What: /sys/fs/ocfs2/loaded_cluster_plugins
- Date: April 2008
- Contact: ocfs2-devel@oss.oracle.com
- Description:
- The /sys/fs/ocfs2/loaded_cluster_plugins file describes
- the available plugins to support ocfs2 cluster operation.
- A cluster plugin is required to use ocfs2 in a cluster.
- There are currently two available plugins:
- * 'o2cb' - The classic o2cb cluster stack that ocfs2 has
- used since its inception.
- * 'user' - A plugin supporting userspace cluster software
- in conjunction with fs/dlm.
- Reading from this file returns the names of all loaded
- plugins, one per line.
- This file is read-only. Its contents may change as
- plugins are loaded or removed.
- What: /sys/fs/ocfs2/active_cluster_plugin
- Date: April 2008
- Contact: ocfs2-devel@oss.oracle.com
- Description:
- The /sys/fs/ocfs2/active_cluster_plugin displays which
- cluster plugin is currently in use by the filesystem.
- The active plugin will appear in the loaded_cluster_plugins
- file as well. Only one plugin can be used at a time.
- Reading from this file returns the name of the active plugin
- on a single line.
- This file is read-only. Which plugin is active depends on
- the cluster stack in use. The contents may change
- when all filesystems are unmounted and the cluster stack
- is changed.
- What: /sys/fs/ocfs2/cluster_stack
- Date: April 2008
- Contact: ocfs2-devel@oss.oracle.com
- Description:
- The /sys/fs/ocfs2/cluster_stack file contains the name
- of current ocfs2 cluster stack. This value is set by
- userspace tools when bringing the cluster stack online.
- Cluster stack names are 4 characters in length.
- When the 'o2cb' cluster stack is used, the 'o2cb' cluster
- plugin is active. All other cluster stacks use the 'user'
- cluster plugin.
- Reading from this file returns the name of the current
- cluster stack on a single line.
- Writing a new stack name to this file changes the current
- cluster stack unless there are mounted ocfs2 filesystems.
- If there are mounted filesystems, attempts to change the
- stack return an error.
- Users:
- ocfs2-tools <ocfs2-tools-devel@oss.oracle.com>
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