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Question on Gaja's Raid Document

From: Rao, Maheswara <Maheswara.Rao_at_Sungardp3.com>
Date: Thu, 20 Sep 2001 06:42:13 -0700
Message-ID: <F001.003937D7.20010920062022@fatcity.com>

List,

While reading Gaja's excellent document on Implementing Raid on Oracle Systems, Gaja mentions the following in his document.

"The degree of striping in the DATA and INDX volumes should also consider factors such as data/index partitioning, availability requirements and support for parallel operations. Please note that 16 datafiles placed on 16 individual drives can support a 16-way parallel operation (if you have memory and CPU to support it and your controller is not out of capacity because all 16 drives engaged at the same time). The same cannot be concluded with 16 datafiles placed on a 16-way RAID volume with 16 drives. The degree of parallelism that you deploy on a 16-way volume will be significantly less, when compared to the former configuration of 16 individual drives. This factor should be factored, when making "degree of striping" decisions, which in turn controls the number of volumes on your system. "

Question:

Why the degree of parallelism is less on a 16-way volume compared to 16 individual drives?

Thanks,

Rao
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Author: Rao, Maheswara
  INET: Maheswara.Rao_at_Sungardp3.com

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