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         - sparse files
  32         - extended attributes
  33         - shared writable mmap
  34         - loopback is supported, but data written will not
  35           be cluster coherent.
  36         - quotas
  37         - cluster aware flock
  38         - cluster aware lockf
  39         - Directory change notification (F_NOTIFY)
  40         - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
  41         - POSIX ACLs
  42         - readpages / writepages (not user visible)
  43
  44 Mount options
  45 =============
  46
  47 OCFS2 supports the following mount options:
  48 (*) == default
  49
  50 barrier=1               This enables/disables barriers. barrier=0 disables it,
  51                         barrier=1 enables it.
  52 errors=remount-ro(*)    Remount the filesystem read-only on an error.
  53 errors=panic            Panic and halt the machine if an error occurs.
  54 intr            (*)     Allow signals to interrupt cluster operations.
  55 nointr                  Do not allow signals to interrupt cluster
  56                         operations.
  57 atime_quantum=60(*)     OCFS2 will not update atime unless this number
  58                         of seconds has passed since the last update.
  59                         Set to zero to always update atime.