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Re: Need help with 8.4 Performance Testing

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Merlin Moncure <mmoncure(at)gmail(dot)com>
Cc: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, Scott Carey <scott(at)richrelevance(dot)com>, Jean-David Beyer <jeandavid8(at)verizon(dot)net>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Need help with 8.4 Performance Testing
Date: 2008-12-09 20:20:42
Message-ID: 1228854042.13962.91.camel@jd-laptop.pragmaticzealot.org (view raw or flat)
Thread:
Lists: pgsql-performance
On Tue, 2008-12-09 at 15:07 -0500, Merlin Moncure wrote:
> On Tue, Dec 9, 2008 at 1:11 PM, Joshua D. Drake <jd(at)commandprompt(dot)com> wrote:
> > Hard drives work, their cheap and fast. I can get 25 spindles, 15k in a
> > 3U with controller and battery backed cache for <$10k.
> 
> While I agree with your general sentiments about early adoption, etc
> (the intel ssd products are the first flash drives that appear to have
> real promise in the enterprise), the numbers tell a different story.

Oh I have read about them and I am excited. I am just saying that there
are plenty of people who can take advantage of the unknown without the
worry of the pain that can cause. My client, can't.

> 
> The main issue that I see with flash SSD is if the promised wear
> lifetimes are believable in high load environments and the mechanism
> of failure (slowly degrade into read only) is accurate.
> 

Right.

> So, at least in relative terms, 15k sas drives are not 'fast'. They
> are terribly, awfully, painfully slow.  They are also not cheap in
> terms of $/IOPS.  The end is near.
> 

No doubt about it. I give it 24 months tops.

Joshua D. Drake


> merlin
> 
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