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Re: Page Checksums + Double Writes

From: David Fetter <david(at)fetter(dot)org>
To: Rob Wultsch <wultsch(at)gmail(dot)com>
Cc: PG Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Page Checksums + Double Writes
Date: 2011-12-22 05:08:16
Message-ID: 20111222050816.GB28026@fetter.org (view raw or flat)
Thread:
Lists: pgsql-hackers
On Wed, Dec 21, 2011 at 04:18:33PM -0800, Rob Wultsch wrote:
> On Wed, Dec 21, 2011 at 1:59 PM, David Fetter <david(at)fetter(dot)org> wrote:
> > One of the things VMware is working on is double writes, per
> > previous discussions of how, for example, InnoDB does things.
> 
> The world is moving to flash, and the lifetime of flash is measured
> writes.  Potentially doubling the number of writes is potentially
> halving the life of the flash.
> 
> Something to think about...

Modern flash drives let you have more write cycles than modern
spinning rust, so while yes, there is something happening, it's also
happening to spinning rust, too.

Cheers,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
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