Authors in alphabetical order:
Joel Becker <joel.becker@oracle.com>
Zach Brown <zach.brown@oracle.com>
-Mark Fasheh <mark.fasheh@oracle.com>
+Mark Fasheh <mfasheh@suse.com>
Kurt Hackel <kurt.hackel@oracle.com>
+Tao Ma <tao.ma@oracle.com>
Sunil Mushran <sunil.mushran@oracle.com>
Manish Singh <manish.singh@oracle.com>
+Tiger Yang <tiger.yang@oracle.com>
Caveats
=======
Features which OCFS2 does not support yet:
- - sparse files
- - extended attributes
- - shared writeable mmap
- - loopback is supported, but data written will not
- be cluster coherent.
- - quotas
- - cluster aware flock
- Directory change notification (F_NOTIFY)
- Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
- - POSIX ACLs
- - readpages / writepages (not user visible)
Mount options
=============
intr (*) Allow signals to interrupt cluster operations.
nointr Do not allow signals to interrupt cluster
operations.
+atime_quantum=60(*) OCFS2 will not update atime unless this number
+ of seconds has passed since the last update.
+ Set to zero to always update atime.
+data=ordered (*) All data are forced directly out to the main file
+ system prior to its metadata being committed to the
+ journal.
+data=writeback Data ordering is not preserved, data may be written
+ into the main file system after its metadata has been
+ committed to the journal.
+preferred_slot=0(*) During mount, try to use this filesystem slot first. If
+ it is in use by another node, the first empty one found
+ will be chosen. Invalid values will be ignored.
+commit=nrsec (*) Ocfs2 can be told to sync all its data and metadata
+ every 'nrsec' seconds. The default value is 5 seconds.
+ This means that if you lose your power, you will lose
+ as much as the latest 5 seconds of work (your
+ filesystem will not be damaged though, thanks to the
+ journaling). This default value (or any low value)
+ will hurt performance, but it's good for data-safety.
+ Setting it to 0 will have the same effect as leaving
+ it at the default (5 seconds).
+ Setting it to very large values will improve
+ performance.
+localalloc=8(*) Allows custom localalloc size in MB. If the value is too
+ large, the fs will silently revert it to the default.
+localflocks This disables cluster aware flock.
+inode64 Indicates that Ocfs2 is allowed to create inodes at
+ any location in the filesystem, including those which
+ will result in inode numbers occupying more than 32
+ bits of significance.
+user_xattr (*) Enables Extended User Attributes.
+nouser_xattr Disables Extended User Attributes.
+acl Enables POSIX Access Control Lists support.
+noacl (*) Disables POSIX Access Control Lists support.