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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
460 DS8800 Performance Monitoring and Tuning
Using ionice to assign I/O priority
A feature of the CFQ I/O elevator is the option to assign priorities on a process level. By using
the ionice utility, you can restrict the disk subsystem utilization of a specific process:
򐂰 Idle: A process with the assigned I/O priority
idle is granted access to the disk subsystems
if no other processes with a priority of
best-effort or higher request access to the data. This
setting is useful for tasks that run when the system has free resources, such as the
updatedb task.
򐂰 Best-effort: As a default, all processes, which do not request a specific I/O priority, are ...
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Publisher Resources

ISBN: 0738436836Purchase book