"Peter Galbavy" <peter.galbavyknowledge.com> writes:

> > Soft Updates use magically delicious write ordering to provide the same
> kind of
> > metadata integrity protection as a journaling filesystem, but without any
> > changes to the underlying filesystem structure. Soft Update support is
> pretty
> > stable in OpenBSD 2.8. As long as
>
> With the greatest of respect, let me refer the gentlemen to the word
> "bollocks".
>
> Sorry, I felt like being frivolous. In reality, softupdates to not provide
> the most important part of a journaling file system, next to ordered writes,
> and that is zero-integrity checking at boot.
>
> One of the major benefits, especially as file systems are getting into the
> terabyte ranges now, is that if there is some catastophic failure (outside
> the file system code) like power or memory fault, then the file system will
> come back clean very quickly - with a log of the writes that can be applied
> in order *if* they are marked as complete.
>
> Maybe I am misunderstanding journaling file systems, but those are the two
> features that I expect to see (fast writes and not fsck).

soft updates do not provide "fast" fsck yet. But they are designed to be
able to do that. It's just a matter of writing the code (or rather, it's a
matter to wait for Kirk McKusick to write the code and import it to OpenBSD
at a later time).

//art

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