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On Wed, 27 Oct 1999, Ronald G. Minnich wrote:
> On Wed, 27 Oct 1999, Chuck Youse wrote:
>
> > One of the biggest reasons for the difference: FreeBSD, by default,
> > performs _synchronous_ metadata updates, and Linux performs asynchronous
> > metadata updates.
> >
> > It's definitely a bit slower, but the payoff is in reliability. I have
> > seen more than one [production!] Linux machine completely trash its
> > filesystems because the implementors decided that their "NT-killer" must
> > have good performance at the expense of serious, production-quality
> > reliability.
>
>
> To put it slightly more strongly: as far as I'm concerned ext2 is not a
as far as I remember ext2 has some "counter". I used to use Linux and
it performed 'fsck' from time to time (even if fs was clearly unmounted).
that is a very good thing to have.
I do not recall that FreeBSD did such thing.
> serious fs if you really care about handling power failures and other such
> fun things. In clusters as small as 64 machines I've measured a 5%
what is standard deviation equal to ? "lanl" means Los-Alamos National
Laboratory ?
> probability that after a power failure one of the 64 ext2 file systems
> will have a trashed root file system. With freebsd, over a four-year span,
> running through lots of power outages, I didn't lose an FFS file system
I DID lose FFS even it was mounted "sync", not async.
> even *once* (except for the disk that burned up, but not even FFS can fix
> that one).
>
> ext2 needs a lot of help. Evidently it will be getting it soon, though.
>
> ron
>
>
>
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