Manual page of mount(8), util-linux 2.15.1~rc1-1, reads
Mount options for xfs
barrier
Enables the use of block layer write barriers for writes
into the journal and unwritten extent conversion. This
allows for drive level write caching to be enabled, for
devices that support write barriers.
<nothing more mentioned>
However in article:
"Barriers and journaling filesystems" 2008-05-21
http://lwn.net/Articles/283161/
... ext3 and ext4 filesystems, by default, do not use barriers. The
option is there, but, unless the administrator has explicitly
requested the use of barriers, these filesystems operate without
them - though some distributions (notably SUSE) change that default.
...
So barriers are disabled by default because they have a serious
impact on performance. And, beyond that, the fact is that people get
away with running their filesystems without using barriers. Reports
of ext3 filesystem corruption are few and far between.
[Discussion]
...
Posted May 21, 2008 14:17 UTC (Wed) by corbet (editor, #1)
Some quick grepping on my kernel tree disk suggests that ext3 got
the barrier option in 2.6.9.
QUESTION
Is the barrier option in the current 2.6.x kernels as mentioned? If it
is could someone document it to the manual page according to the
article.
Jari
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