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- OCFS2 filesystem
- ==================
- OCFS2 is a general purpose extent based shared disk cluster file
- system with many similarities to ext3. It supports 64 bit inode
- numbers, and has automatically extending metadata groups which may
- also make it attractive for non-clustered use.
- You'll want to install the ocfs2-tools package in order to at least
- get "mount.ocfs2" and "ocfs2_hb_ctl".
- Project web page: http://oss.oracle.com/projects/ocfs2
- Tools web page: http://oss.oracle.com/projects/ocfs2-tools
- OCFS2 mailing lists: http://oss.oracle.com/projects/ocfs2/mailman/
- All code copyright 2005 Oracle except when otherwise noted.
- CREDITS:
- Lots of code taken from ext3 and other projects.
- Authors in alphabetical order:
- Joel Becker <joel.becker@oracle.com>
- Zach Brown <zach.brown@oracle.com>
- Mark Fasheh <mark.fasheh@oracle.com>
- Kurt Hackel <kurt.hackel@oracle.com>
- Sunil Mushran <sunil.mushran@oracle.com>
- Manish Singh <manish.singh@oracle.com>
- Caveats
- =======
- Features which OCFS2 does not support yet:
- - extended attributes
- - quotas
- - cluster aware flock
- - cluster aware lockf
- - Directory change notification (F_NOTIFY)
- - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
- - POSIX ACLs
- - readpages / writepages (not user visible)
- Mount options
- =============
- OCFS2 supports the following mount options:
- (*) == default
- barrier=1 This enables/disables barriers. barrier=0 disables it,
- barrier=1 enables it.
- errors=remount-ro(*) Remount the filesystem read-only on an error.
- errors=panic Panic and halt the machine if an error occurs.
- 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.
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