March 2008
Intermediate to advanced
326 pages
10h 22m
English
book
SAN Volume Controller: Best Practices and Performance Guidelines
by Jon Tate, Deon George, Thorsten Hoss, Ronda Hruby, Ian MacQuarrie, Barry Mellish, Peter Mescher
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Chapter 6.2.1. Host I/O
Page 86
86 SAN Volume Controller: Best Practices and Performance Guidelines 6.1 Back- end queue depth The SAN Volume Controller ( SVC) submits I/ O to the back- end ( MDisk) storage in the same fashion as any direct- attached host. For direct- attached storage, the queue depth is tunable at the host and is often optimized based on specific storage type as well as various other parameters, such as the number of initiators. For the SVC, the queue depth is also tuned; however, the optimal value used is calculated internally. This is the formula SVC uses for calculating queue depth. There are two parts to the algorithm: a per MDisk limit and a per controller port limit. Q = (( P x C) / N) / M If Q > 60, then Q= 60 ( maximum ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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