Journaling vs. Softupdates
xfb52 at dial.pipex.com
Wed Jul 20 10:11:23 GMT 2005
Zev Thompson wrote:
> Apparently one of the Google Summer of Code projects is to add
> journaling to UFS. When it already has softupdates, why? I've seen
> benchmarks that seem to indicate that softupdates performs as well or
> better in most cases, though I have nothing on hand to substantiate
> that. I thought the only real disadvantages of softupdates were:
> - harder to code and implement (though this is already done, so should
> not be an issue)
> - sometimes deleting files does not free space right away
> Possibility of data loss, I'm guessing, is the same with either.
> Filesystem corruption is similarly very unlikely.
> So why the change? Thanks in advance for any answers.
Large filesystems without journaling take too long to fsck.
There's plenty of messages about this out there, otherwise I wouldn't
have know the answer :-)
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