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SubjectRe: [patch] ext2/3: document conditions when reliable operation is possible
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...

All rights reversed.

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