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DS8800 Performance Monitoring and Tuning
book

DS8800 Performance Monitoring and Tuning

by Gero Schmidt, Bertrand Dufrasne, Jana Jamsek, Peter Kimmel, Hiroaki Matsuno, Flavio Morais, Lindsay Oxenham, Antonio Rainero, Denis Senin
July 2012
Intermediate to advanced content levelIntermediate to advanced
726 pages
26h 28m
English
IBM Redbooks
Content preview from DS8800 Performance Monitoring and Tuning
Chapter 9. Performance considerations for UNIX servers 337
DEV#: 1 DEVICE NAME: hdisk1
===============================
Total Read Total Write Active Read Active Write Maximum
I/O: 69227 49414 0 0 40
SECTOR: 1294593 1300373 0 0 1737
Transfer Size: <= 512 <= 4k <= 16K <= 64K > 64K
118 20702 80403 12173 5245
# pcmpath query adaptstats
Adapter #: 0
=============
Total Read Total Write Active Read Active Write Maximum
I/O: 88366 135054 0 0 258
SECTOR: 2495579 4184324 0 0 3897
We are interested in the Maximum field, which indicates the maximum number of I/Os
submitted to the device since system boot. The Maximum for devstats does not exceed
queue_depth ...
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Publisher Resources

ISBN: 0738436836Purchase book