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Re: Block-level CRC checks

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 (view raw or flat)
Thread:
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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