On Fri, 24 Mar 2000, Mike Smith wrote:
> >
> > I searched the mailing list archive. I am not sure whether Vinum has
> > solved the problem of atomic writes in a stripe to both the data fragment
> > and parity fragment (RAID 5). In the case of a crash, you have no idea of
> > where the writes have finished (even worse, a fragment may contain
> > several sectors).
>
> This problem can't be solved with software-only RAID, and no (sensible)
> software RAID implementation attempts to deal with it. Software RAID
> reliability is predicated on the correct functioning of the system; it's
> there to provide fault tolerance for the high-failure-rate hardware (eg.
> disks).
Thanks. It seems to me that you are saying software RAID can NOT cope with
system crash and power failure? What about the Zebra filesystem or
something like two-phase commit?
-Zhihui
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