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 10.2.3. Path management
Page 178
178 SAN Volume Controller: Best Practices and Performance Guidelines In Table 10- 4, we show the effect of using the non- preferred paths compared to the preferred paths on read performance. Table 10- 4 Random ( 1 TB) 4 Kb read response time ( 4.1 nodes, usecs) Table 10- 5 shows the effect of using non- preferred nodes on write performance. Table 10- 5 Random ( 1 TB) 4 Kb write response time ( 4.2 nodes, usecs) IBM SDD, SDDDSM, and SDDPCM software recognize the preferred nodes and utilize the preferred paths. 10.2.3 Path management The SVC design is based on multiple path access from the host to both SVC nodes. Multipathing software is expected to retry down multiple paths upon detection of an error. We ...
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