| From: | Joshua Drake <jd(at)commandprompt(dot)com> |
|---|---|
| To: | "Jeffrey Baker" <jwbaker(at)gmail(dot)com> |
| Cc: | "Bruce Momjian" <bruce(at)momjian(dot)us>, "Alvaro Herrera" <alvherre(at)commandprompt(dot)com>, "Pg Hackers" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Block-level CRC checks |
| Date: | 2008-09-30 21:11:36 |
| Message-ID: | 20080930141136.01370e16@jd-laptop |
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| Lists: | pgsql-hackers |
On Tue, 30 Sep 2008 13:48:52 -0700
"Jeffrey Baker" <jwbaker(at)gmail(dot)com> wrote:
>
> Practically all of them. Here is a good paper on various checksums,
> their failure rates, and practical applications.
>
> "Parity Lost and Parity Regained"
> http://www.usenix.org/event/fast08/tech/full_papers/krioukov/krioukov_html/index.html
>
In a related article published in Login called "Data Corruption in the
storage stack: a closer look" they say:
During a 41-month period we observed more than 400,000 instances of
checksum mistmatches, 8% of which were discovered during RAID
reconstruction, creating the possibility of real data loss.
They also have a wonderful term they mention, "Silent Data corruptions".
Joshua D. Drake
[1] Login June 2008
> -jwb
--
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