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

  • From: Tim Gorman <tim@xxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Thu, 15 Aug 2013 07:30:49 -0600

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."
--
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