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SubjectRe: Corruption Stats (fwd)
Is that why my work NT system pauses during shutdown, and the pause is
much longer then OS/2 used to? john alvord

On Thu, 30 Jul 1998, Rob Hagopian wrote:

> It's not true though, Apple had a BIG problem with this at one point -
> they started shipping computers with the write cache enabled on the
> internal drives (and it was about time). Of course, the Macs all have
> software power-off (<ob Macs rule> ;-) and the file system would get
> corrupted. IIRC, the solution was simply to delay long enough for the
> caches to flush automaticly.
> -Rob H.
>
> On Wed, 29 Jul 1998, Linus Torvalds wrote:
>
> > On Thu, 30 Jul 1998, Stefan Traby wrote:
> > >
> > > BTW: A drive following the SCSI-specs may cause disk-corruption
> > > under Linux (WCE=1). Data may still be in write-cache after
> > > shutdown and power-off. (I miss "synchronize cache").
> > > This is for shure a theoretical problem, but a practical bug.
> > > Or did I miss something ?
> >
> > No, you didn't miss anything.
> >
> > The thing has been discussed occasionally (very occasionally), and I don't
> > know what the proper response is. According to some people the better
> > drives make sure that they have enough rotational energy that they can
> > make sure they get their data written out even after powerdown, but
> > personally that sounds like science fiction to me (oh, I wouldn't be
> > surprised if there are some drives that do it, but I'd be surprised if
> > it's universal).
> >
> > Of course, Linux itself won't ever shut off the power, so it's more a
> > matter of "when can you safely say 'System halted.'" than anything else.
> > The kernel does support some shutdown features, but the disk is not on
> > that list.
> >
> > Linus
>
>
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