[Pvfs2-users] physical disk access

[Kyle Schochenmaier]

 From what I have seen, even 'sequential' pvfs2 accesses are handled in 
a very non-sequential manner when it reaches the physical disk.  Would 
anyone know if enabling NCQ, or other command queuing behaviors would be 
beneficial for performance?

In general we disable queuing because maintaining the queue on the disk 
presents a performance hit for our entirely sequential disk access 
patterns, but I would consider enabling it if this would be overcome by 
the benefits?

Does anyone have any experience with this and pvfs2 filesystems?

    +=Kyle

-- 
Kyle Schochenmaier
kschoche at scl.ameslab.gov
Research Assistant, Dr. Brett Bode
AmesLab - US Dept.Energy
Scalable Computing Laboratory