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Mostly taken from ext3. This allows the user to set the jbd commit interval, in seconds. The default of 5 seconds stays the same, but now users can easily increase the commit interval. Typically, this would be increased in order to benefit performance at the expense of data-safety. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
74 lines
2.8 KiB
Text
74 lines
2.8 KiB
Text
OCFS2 filesystem
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==================
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OCFS2 is a general purpose extent based shared disk cluster file
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system with many similarities to ext3. It supports 64 bit inode
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numbers, and has automatically extending metadata groups which may
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also make it attractive for non-clustered use.
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You'll want to install the ocfs2-tools package in order to at least
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get "mount.ocfs2" and "ocfs2_hb_ctl".
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Project web page: http://oss.oracle.com/projects/ocfs2
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Tools web page: http://oss.oracle.com/projects/ocfs2-tools
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OCFS2 mailing lists: http://oss.oracle.com/projects/ocfs2/mailman/
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All code copyright 2005 Oracle except when otherwise noted.
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CREDITS:
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Lots of code taken from ext3 and other projects.
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Authors in alphabetical order:
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Joel Becker <joel.becker@oracle.com>
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Zach Brown <zach.brown@oracle.com>
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Mark Fasheh <mark.fasheh@oracle.com>
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Kurt Hackel <kurt.hackel@oracle.com>
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Sunil Mushran <sunil.mushran@oracle.com>
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Manish Singh <manish.singh@oracle.com>
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Caveats
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=======
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Features which OCFS2 does not support yet:
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- extended attributes
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- quotas
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- cluster aware flock
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- cluster aware lockf
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- Directory change notification (F_NOTIFY)
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- Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
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- POSIX ACLs
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Mount options
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=============
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OCFS2 supports the following mount options:
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(*) == default
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barrier=1 This enables/disables barriers. barrier=0 disables it,
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barrier=1 enables it.
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errors=remount-ro(*) Remount the filesystem read-only on an error.
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errors=panic Panic and halt the machine if an error occurs.
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intr (*) Allow signals to interrupt cluster operations.
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nointr Do not allow signals to interrupt cluster
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operations.
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atime_quantum=60(*) OCFS2 will not update atime unless this number
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of seconds has passed since the last update.
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Set to zero to always update atime.
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data=ordered (*) All data are forced directly out to the main file
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system prior to its metadata being committed to the
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journal.
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data=writeback Data ordering is not preserved, data may be written
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into the main file system after its metadata has been
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committed to the journal.
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preferred_slot=0(*) During mount, try to use this filesystem slot first. If
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it is in use by another node, the first empty one found
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will be chosen. Invalid values will be ignored.
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commit=nrsec (*) Ocfs2 can be told to sync all its data and metadata
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every 'nrsec' seconds. The default value is 5 seconds.
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This means that if you lose your power, you will lose
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as much as the latest 5 seconds of work (your
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filesystem will not be damaged though, thanks to the
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journaling). This default value (or any low value)
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will hurt performance, but it's good for data-safety.
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Setting it to 0 will have the same effect as leaving
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it at the default (5 seconds).
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Setting it to very large values will improve
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performance.
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