Re: Data integrity built into the storage stack

From: Pavel Machek
Date: Tue Sep 01 2009 - 16:05:28 EST

On Tue 2009-09-01 09:18:07, jim owens wrote:
> Pavel Machek wrote:
>> Hi!
>>> I do agree that we do have to be more prepared for collateral damage
>>> scenarios. As we discussed at LS we have 4KB drives coming out that can
>>> invalidate previously acknowledged I/Os if it gets a subsequent write
>>> failure on a sector. And there's also the issue of fractured writes
>> Hmmm, future will be interesting.
>> 'ext3 expects disks to behave like disks from 1995' (alarming).
> NO... stop saying "ext3". All file systems expect that
> what the disk tell us is the "sector size" (now know by
> disk vendors as "block size") is "atomic".

Yep, but ext3 disables barriers by default. So it has more than
blocksize issue :-(.

(cesky, pictures)
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