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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
480 DS8800 Performance Monitoring and Tuning
Queue depth and the number of command elements in the VIOS
When you connect the DS8000 to an IBM i through the VIOS, consider the following types of
queue depths:
򐂰 The queue depth per LUN: SCSI command tag queuing in the IBM i operating system
enables up to 32 I/O operations to one LUN at the same time. This queue depth is valid for
either connection with VIOS vscsi or connection with VIOS_NPIV.
򐂰 If the DS8000 is connected in VIOS vscsi, consider the queue depth 32 per physical disk
(hdisk) in the VIOS. This queue depth indicates the maximum number of I/O requests that
can be outstanding on a physical disk in the VIOS at one time.
򐂰 The number of command elements per port in a physical adapter in ...
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Publisher Resources

ISBN: 0738436836Purchase book