Provided by: ocfs2-tools_1.8.7-1build1_amd64 bug


       mount.ocfs2 -  mount an OCFS2 filesystem


       mount.ocfs2 [-vn] [-o options] device dir


       mount.ocfs2  mounts  an  OCFS2  filesystem at dir. It is usually invoked indirectly by the
       mount(8) command.


              Indicates that the file system resides on a device  that  requires  network  access
              (used  to  prevent  the system from attempting to mount these filesystems until the
              network has been enabled on the system). mount.ocfs2(8) transparently appends  this
              option  during  mount.  However,  users  mounting  the  volume  via /etc/fstab must
              explicitly specify this mount option to delay the system from mounting  the  volume
              until after the network has been enabled.

              The file system will not update access time.

              The  file system will update atime only if the on-disk atime is older than mtime or
              ctime. This is the default mode.

              The file system will always perform atime updates, but the minimum update  interval
              is  specified  by atime_quantum which defaults to 60 secs. Set it to zero to always
              update atime. These two options need work together.

              Enables / disables POSIX ACLs (access control lists)  support.  It  is  enabled  by

              Enables / disables extended user attributes. It is enabled by default.

              Sync  all  data  and  metadata every nrsec seconds. The default value is 5 seconds.
              Zero means default.

              Specifies the handling of file data during metadata journalling.

                     This is the default mode. Data is flushed to disk before  the  corresponding
                     meta-data is committed to the journal.

                     Data   ordering  is  not  preserved  - data may be flushed to disk after the
                     corresponding meta-data is committed to the journal. This is rumored  to  be
                     the  higher-throughput  option.  While  it  guarantees  internal file system
                     integrity, it can allow old data to  appear  in  files  after  a  crash  and
                     journal recovery.

              Specifies the behavior when an on-disk corruption is encountered.

                     This is the default mode. The file system is remounted read-only.

              panic  The system is halted via panic.

                     Ignore  errors.  Just  log  error  message, return error code to the calling
                     process and continue.

              This disables cluster-aware flock(2).

              Specifies the extent of coherency for the cached  file  data  across  the  cluster.
              This mount option works with Linux kernel 2.6.37 and later.

              full   This  is  the  default mode. The file system ensures the cached file data is
                     coherent across the cluster for all IO modes.

                     The file system only ensures the cached file  data  coherency  for  buffered
                     mode  IOs.  It does not perform IO serialization for direct IOs. This allows
                     multiple nodes to perform concurrent direct IOs to the same  file.  This  is
                     the recommended mode for volumes hosting database files.

              Specifies  the level of allocation reservation for files. The higher the value, the
              more aggressive it is. Valid values are between 0 (reservation off) to  8  (maximum
              space for reservation). It defaults to 2. This mount option works with Linux kernel
              2.6.35 and later.

              By default, directory reservation scales  with  file  reserveration.  Users  should
              rarely need to change this value. If the file allocation reservation is turned off,
              this option will have no effect. This mount option works with Linux  kernel  2.6.35
              and later.

              Indicates  that  the  file  system can create inodes at any location in the volume,
              including those which will result in inode numbers greater than 4 billion.

              This option allows users to  mount  a  clustered  volume  without  configuring  the
              cluster  stack.  However, you must be aware that you can only mount the file system
              from one node at the same time, otherwise, the file system may be  damaged.  Please
              use it with caution.

              Specifies whether a signal can interrupt IOs. It is disabled by default.

       ro     Mount the file system read-only.

       rw     Mount the file system read-write.


       To mount and umount a OCFS2 volume, do:

       # mount /dev/sda1 /mount/path
       # umount /mount/path

       Users mounting a clustered volume should be aware of the following:

           1. The cluster stack must to be online for a clustered mount to succeed.

           2.  The  clustered  mount operation is not instantaneous; it must wait for the node to
           join the DLM domain.

           3. Likewise, clustered umount is also not instantaneous;  it  involves  migrating  all
           mastered lock-resources to the other nodes in the cluster.

       If  the  mount  fails,  detailed  errors  can  be  found via dmesg(8). These might include
       incorrect cluster configuration (say, a  missing  node  or  incorrect  IP  address)  or  a
       firewall  interfering  with  o2cb  network  traffic.  Check the configuration as listed in
       o2cb(7) or the man page of the active cluster stack.

       To auto-mount volumes on startup, the file system tools include  an  ocfs2  init  service.
       This  runs  after  the  o2cb  init service has started the cluster. The ocfs2 init service
       mounts all OCFS2 volumes listed in /etc/fstab.

       # chkconfig --add o2cb
       o2cb 0:off 1:off 2:on 3:on 4:off 5:on 6:off

       $ chkconfig --add ocfs2
       o2cb 0:off 1:off 2:on 3:on 4:off 5:on 6:off

       $ cat /etc/fstab
       /dev/sda1     /u01     ocfs2     _netdev,defaults     0  0


       debugfs.ocfs2(8)  fsck.ocfs2(8)  mkfs.ocfs2(8)   mounted.ocfs2(8)   o2cb(7)   o2cluster(8)
       o2image(8) o2info(1) tunefs.ocfs2(8)


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