Documentation/filesystems/ocfs2.txt

   1 OCFS2 filesystem
   2 ==================
   3 OCFS2 is a general purpose extent based shared disk cluster file
   4 system with many similarities to ext3. It supports 64 bit inode
   5 numbers, and has automatically extending metadata groups which may
   6 also make it attractive for non-clustered use.
   7
   8 You'll want to install the ocfs2-tools package in order to at least
   9 get "mount.ocfs2" and "ocfs2_hb_ctl".
  10
  11 Project web page:    http://oss.oracle.com/projects/ocfs2
  12 Tools web page:      http://oss.oracle.com/projects/ocfs2-tools
  13 OCFS2 mailing lists: http://oss.oracle.com/projects/ocfs2/mailman/
  14
  15 All code copyright 2005 Oracle except when otherwise noted.
  16
  17 CREDITS:
  18 Lots of code taken from ext3 and other projects.
  19
  20 Authors in alphabetical order:
  21 Joel Becker   <joel.becker@oracle.com>
  22 Zach Brown    <zach.brown@oracle.com>
  23 Mark Fasheh   <mark.fasheh@oracle.com>
  24 Kurt Hackel   <kurt.hackel@oracle.com>
  25 Sunil Mushran <sunil.mushran@oracle.com>
  26 Manish Singh  <manish.singh@oracle.com>
  27
  28 Caveats
  29 =======
  30 Features which OCFS2 does not support yet:
  31         - extended attributes
  32         - quotas
  33         - cluster aware flock
  34         - cluster aware lockf
  35         - Directory change notification (F_NOTIFY)
  36         - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
  37         - POSIX ACLs
  38
  39 Mount options
  40 =============
  41
  42 OCFS2 supports the following mount options:
  43 (*) == default
  44
  45 barrier=1               This enables/disables barriers. barrier=0 disables it,
  46                         barrier=1 enables it.
  47 errors=remount-ro(*)    Remount the filesystem read-only on an error.
  48 errors=panic            Panic and halt the machine if an error occurs.
  49 intr            (*)     Allow signals to interrupt cluster operations.
  50 nointr                  Do not allow signals to interrupt cluster
  51                         operations.
  52 atime_quantum=60(*)     OCFS2 will not update atime unless this number
  53                         of seconds has passed since the last update.
  54                         Set to zero to always update atime.
  55 data=ordered    (*)     All data are forced directly out to the main file
  56                         system prior to its metadata being committed to the
  57                         journal.
  58 data=writeback          Data ordering is not preserved, data may be written
  59                         into the main file system after its metadata has been
  60                         committed to the journal.
  61 preferred_slot=0(*)     During mount, try to use this filesystem slot first. If
  62                         it is in use by another node, the first empty one found
  63                         will be chosen. Invalid values will be ignored.