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.
8 You'll want to install the ocfs2-tools package in order to at least
9 get "mount.ocfs2" and "ocfs2_hb_ctl".
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/
15 All code copyright 2005 Oracle except when otherwise noted.
18 Lots of code taken from ext3 and other projects.
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>
30 Features which OCFS2 does not support yet:
35 - Directory change notification (F_NOTIFY)
36 - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
38 - readpages / writepages (not user visible)
43 OCFS2 supports the following mount options:
46 barrier=1 This enables/disables barriers. barrier=0 disables it,
48 errors=remount-ro(*) Remount the filesystem read-only on an error.
49 errors=panic Panic and halt the machine if an error occurs.
50 intr (*) Allow signals to interrupt cluster operations.
51 nointr Do not allow signals to interrupt cluster
53 atime_quantum=60(*) OCFS2 will not update atime unless this number
54 of seconds has passed since the last update.
55 Set to zero to always update atime.
56 data=ordered (*) All data are forced directly out to the main file
57 system prior to its metadata being committed to the
59 data=writeback Data ordering is not preserved, data may be written
60 into the main file system after its metadata has been
61 committed to the journal.
62 preferred_slot=0(*) During mount, try to use this filesystem slot first. If
63 it is in use by another node, the first empty one found
64 will be chosen. Invalid values will be ignored.