| Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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: |
| Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 31 | - extended attributes |
| Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 32 | - quotas |
| 33 | - cluster aware flock |
| J. Bruce Fields | 0d419a6 | 2006-01-11 16:55:00 -0500 | [diff] [blame] | 34 | - cluster aware lockf |
| Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 35 | - Directory change notification (F_NOTIFY) |
| 36 | - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease) |
| 37 | - POSIX ACLs |
| 38 | - readpages / writepages (not user visible) |
| 39 | |
| 40 | Mount options |
| 41 | ============= |
| 42 | |
| 43 | OCFS2 supports the following mount options: |
| 44 | (*) == default |
| 45 | |
| 46 | barrier=1 This enables/disables barriers. barrier=0 disables it, |
| 47 | barrier=1 enables 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 |
| 52 | operations. |
| Tiger Yang | bcd5625 | 2006-12-05 10:09:17 +0800 | [diff] [blame] | 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. |
| Mark Fasheh | 10b0845 | 2007-08-23 11:17:55 -0700 | [diff] [blame] | 56 | data=ordered (*) All data are forced directly out to the main file |
| 57 | system prior to its metadata being committed to the |
| 58 | journal. |
| 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. |