Messages in this thread | | | Date | Mon, 27 Oct 2003 20:03:02 GMT | From | John Bradford <> | Subject | Re: Blockbusting news, results get worse |
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Quote from Jeff Garzik <jgarzik@pobox.com>: > Hans Reiser wrote: > > Mudama, Eric wrote: > > > >> > >> or put it under heavy write workload and remove > >> power. > >> > > Can you tell us more about what really happens to disk drives when the > > power is cut while a block is being written? We engage in a lot of > > uninformed speculation, and it would be nice if someone who really knows > > told us.... > > > > Do drives have enough capacitance under normal conditions to finish > > writing the block? Does ECC on the drive detect that the block was bad > > and so we don't need to detect it in the FS? > > > Does it really matter to speculate about this? > > If you don't FLUSH CACHE, you have no guarantees your data is on the > platter.
I think that the idea that is floating around is to deliberately ruin the formatting on part of the drive in order to simulate a bad block.
Operation of disk drives immediately after a power failiure has been discussed before, by the way:
http://marc.theaimsgroup.com/?l=linux-kernel&m=100665153518652&w=2
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