Re: Fwd: Re: Intelligent Data Placement - IDP question regarding using this for different physical devices

From: Kevin Jernigan <kevin.jernigan_at_oracle.com>
Date: Thu, 15 Aug 2013 10:36:19 -0400
Message-ID: <520CE763.6000907_at_oracle.com>

No worries, I probably should have edited the comments I received, rather than wholesale cut-and-paste. The PM in question is probably referring to "inventing" the concept of IDP within the context of ASM...KJ

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Kevin Jernigan
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On 8/15/13 9:36 AM, Tim Gorman wrote:


> Of course, after I pressed "Send", I noticed that I seemed to be

> attributing the cited comment to Mr. Jernigan himself, which of course

> is not the case, as he was generously passing on a comment from someone

> within the Oracle development organization.  My sincere apologies if

> that impression was conveyed.

>

> Thanks so much for your contributions, Kevin!

>

>

> On 8/14/2013 10:22 PM, Kevin Jernigan wrote:

>> I invented the concept of IDP before SSD devices were common place. IDP does not cause

>> preferential allocation across different device classes. Consequential,

>> this scheme will not work...

> I find it a bit jarring to see the phrase "invented the concept" used in

> this context.  Logical volume managers have included similar capabilties

> for decades, such as the AIX "mklv" command with its "-a" flag, by which

> allocation/placement preference can be specified (i.e. inner edge, outer

> edge, center, etc).  This capability was old news when I was an AIX

> administrator in the early 1990s, and while of course the specifics of

> the Oracle ASM mechanism of IDP are different and more advanced, natural

> after 15-20 years of technological advance, it is one thing to build

> upon a concept, another thing to invent it.

>

> I had a great friend at Oracle Consulting back in the 1990s, Gene

> Fosnight, who used the following aphorism for his email signature,

> "Look, listen, and learn, for an original mistake is as rare as an

> original idea."

>

>

>

> --

> http://www.freelists.org/webpage/oracle-l

>

>


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Received on Thu Aug 15 2013 - 16:36:19 CEST