Re: [patch] ext2/3: document conditions when reliable operation ispossible

[Rik van Riel]

Pavel Machek wrote:
> Hi!
>
> > > Ok, can you help? Having a piece of MD documentation explaining the
> > > "powerfail nukes entire stripe" and how current filesystems do not
> > > deal with that would be nice, along with description when exactly that
> > > happens.
> > Except of course for the inconvenient detail that a power
> > failure on a degraded RAID 5 array does *NOT* nuke the
> > entire stripe.
>
> Ok, you are right. It will nuke unrelated sector somewhere on the
> stripe (one that is "old" and was not recently written) -- which is
> still something ext3 can not reliably handle.

Not quite unrelated.  The "nuked" sector will be the one
that used to live on the disk that is broken and no longer
a part of the RAID 5 array.

I wouldn't qualify a missing hard disk as a software issue...

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