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Re: mysql to postgresql, performance questions

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: James Mansion <james(at)mansionfamily(dot)plus(dot)com>
Cc: Hannu Krosing <hannu(at)2ndQuadrant(dot)com>, Yeb Havinga <yebhavinga(at)gmail(dot)com>, Greg Smith <greg(at)2ndQuadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Ross J(dot) Reedstrom" <reedstrm(at)rice(dot)edu>, pgsql-performance(at)postgresql(dot)org
Subject: Re: mysql to postgresql, performance questions
Date: 2010-03-31 14:23:29
Message-ID: 201003311423.o2VENTD15761@momjian.us (view raw or flat)
Thread:
Lists: pgsql-performance
James Mansion wrote:
> Hannu Krosing wrote:
> > Pulling the plug should not corrupt a postgreSQL database, unless it was
> > using disks which lie about write caching.
> >   
> Didn't we recently put the old wife's 'the disks lied' tale to bed in 
> favour of actually admiting that some well known filesystems and 
> saftware raid systems have had trouble with their write barriers?

I thought the issue was that many file systems do not issue the drive
ATAPI flush command, and I suppose drives are allowed not to flush on
write if they honor the command.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

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