"Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> writes:
> On Thu, Oct 30, 2008 at 4:01 PM, Gregory Stark <stark(at)enterprisedb(dot)com> wrote:
>> I can't really see trusting Postgres on a filesystem that felt free to
>> compress portions of it. Would the filesystem still be able to guarantee that
>> torn pages won't "tear" across adjacent blocks? What about torn pages that
>> included hint bits being set?
> I can't see PostgreSQL noticing it. PostgreSQL hands the OS a 512byte
> block, the OS compresses it and it's brethren as the go to disk,
> uncompresses as they come out, and as long as what you put in is what
> you get back it shouldn't really matter.
I think Greg's issue is exactly about what guarantees you'll have left
after the data that comes back fails to be the data that went in.
regards, tom lane
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