| From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
|---|---|
| To: | Greg Smith <greg(at)2ndQuadrant(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndQuadrant(dot)com>, Ants Aasma <ants(at)cybertec(dot)at>, Jeff Davis <pgsql(at)j-davis(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andres Freund <andres(at)2ndquadrant(dot)com>, Florian Pflug <fgp(at)phlo(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Bruce Momjian <bruce(at)momjian(dot)us>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
| Subject: | Re: Substituting Checksum Algorithm (was: Enabling Checksums) |
| Date: | 2013-04-30 21:26:22 |
| Message-ID: | 20130430212621.GB24585@svana.org |
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| Lists: | pgsql-hackers |
On Tue, Apr 30, 2013 at 01:05:30PM -0400, Greg Smith wrote:
> I re-ran the benchmark that's had me most worried against the
> committed code and things look good so far. I've been keeping quiet
> because my tests recently have all agreed with what Ants already
> described. This is more a confirmation summary than new data.
I came across this today: Data Integrity Extensions, basically a
standard for have an application calculate a checksum of a block and
submitting it together with the block so that the disk can verify that
the block it is writing matches what the application sent.
It appears SCSI has standardised on a CRC-16 checksum with polynomial
0x18bb7 .
http://www.t10.org/ftp/t10/document.03/03-290r0.pdf
https://oss.oracle.com/~mkp/docs/dix-draft.pdf
Not directly relavent to PostgreSQL now, but possibly in the future.
Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> He who writes carelessly confesses thereby at the very outset that he does
> not attach much importance to his own thoughts.
-- Arthur Schopenhauer
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