Re: Simulating disk failure with a writeback cache

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On Tue, Dec 20, 2016 at 01:01:29AM +0000, Josef Bacik wrote:
> One thing I was definitely going to do is use the dm thin provisioning so I
> could snapshot between each check so we don't have to replay from the
> beginning every time we want to check a different mark.  Replaying the whole
> thing is fine for small runs like the fsx thing, but when you want to say run
> fsstress for a minute and replay to every fua and fsck and mount it gets
> tedious fast.  Thanks,

I actually just converted my new test to do that:

https://evilpiepirate.org/git/ktest.git/commit/

now, most of the time in the test is spent in mount/unmount (bcachefs doesn't
have a standalone fsck yet, we check everything fsck should but it's done at
mount time).
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