Re: Intelligent Data Placement - IDP question regarding using this for different physical devices
Date: Thu, 15 Aug 2013 07:30:49 -0600
Message-ID: <520CD809.1030200_at_evdbt.com>
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-lReceived on Thu Aug 15 2013 - 15:30:49 CEST