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
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