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Re: Block-level CRC checks

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Paul Schlie <schlie(at)comcast(dot)net>
Cc: Brian Hurt <bhurt(at)janestcapital(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Block-level CRC checks
Date: 2008-10-01 15:56:30
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Lists: pgsql-hackers
Paul Schlie <schlie(at)comcast(dot)net> writes:
> - yes, if you're willing to compute true CRC's as opposed to simpler
> checksums, which may be worth the price if in fact many/most data
> check failures are truly caused by single bit errors somewhere in the
> chain,

FWIW, not one of the corrupted-data problems I've investigated has ever
looked like a single-bit error.  So the theoretical basis for using a
CRC here seems pretty weak.  I doubt we'd even consider automatic repair
attempts anyway.

			regards, tom lane

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