Re: srfs - a new file system.

Andreas Dilger
2003-10-24T20:38:41Z

On Oct 24, 2003 14:24 -0600, Pat LaVarre wrote:
> > > a one to 10^gazillion chance of this happening,
> >
> > So, system stabilizes when there are no files left ;-).
>
> Anyone have a measure of how often these events actually do occur?
>
> What little I've seen people say of how they design file and RAID
> systems speaks as if HDD's reliably chose either to read back what you
> wrote to them or else reported an error.
>
> What about when the HDD actually reads back something else?
>
> How can we know how commonly that occurs in practice, so that we can
> know how often we're wrong to believe such things as our locally
> recorded vector time?

There are lots of ways to read back garbage from a disk unrelated to
physical HDD errors: memory errors, bad cables, software errors (driver,
fs, vm, etc), bad IDE DMA settings, power failures during write, etc...

Cheers, Andreas
--
Andreas Dilger