Re: True fsync() in Linux (on IDE)

[Christoffer Hall-Frederiksen <hall@diku.dk>]

Matthias Andree wrote:
> Jens Axboe schrieb am 2004-03-22:
> 
> 
>>There's no such thing as atomic writes bigger than a sector really, we
>>just pretend there is. Timing usually makes this true.

;)

> 
> If there is no such atomicity (except maybe in ext3fs data=journal or
> the upcoming reiserfs4 - isn't there?), then nobody should claim so. If
> the kernel cannot 100.00000000% guarantee the write is atomic, claiming
> otherwise is plain fraud and nothing else.
> 
> Some people bet their whole business/company and hence a fair deal of
> their belongings on a single data base, and making them believe facts
> that simply aren't reality is dangerous. These people will have very
> little understanding for sloppiness here. Linux has no obligation to be
> fast or reliable, but it MUST PROPERLY AND TRUTHFULLY state what it can
> guarantee and what it cannot guarantee.

Some databases (eg. oracle) can write a checksum for each database page 
to overcome this problem, as this is not just "a linux problem".


-- 
	Christoffer

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