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CIFS High I/O Utilization.

carlos mendoza
Occasional Contributor

CIFS High I/O Utilization.

We recenttly upgraded CIFS(samba) to vers. A01.06 and have noticed the Disk IO utilization increase dramatically. Has anyone run into this issue and if so are there any parameters which have to tweked. We are running it on a HPUX 11i service guarded platform. Also, are there any patches required?
Michael Steele_2
Honored Contributor

Re: CIFS High I/O Utilization.

CIFS 11.i patches:

s700_800 11.11 mountall cumulative patch, Dev IDs enabler PHCO_24777 ( 3 stars )
Notes: PHCO_27958 ( 2 stars )

s700_800 11.X OV EMANATE14.2 hp_unixagt filesystem fix PHSS_28776 ( 1 star )

What's going on with your logs?

log file = /cifs/samba/log/%m.%u.log

What did testparms indicate?

And dos2ux /etc/opt/samba/smb.conf?

Also run "...sar -d 5 5..." and attach.
Support Fatherhood - Stop Family Law
Darren Prior
Honored Contributor

Re: CIFS High I/O Utilization.


I'm not aware of any issues related to disk i/o on that version. Having said that A.01.06 is still a few versions behind - what version were you running previously as there may be some new parameters between the 2 revisions.

You should read this thread regarding security issues which will affect the version you are running:,,0x2d4f28c64656d71190080090279cd0f9,00.html


Calm down. It's only ones and zeros...
Steven E. Protter
Exalted Contributor

Re: CIFS High I/O Utilization.

Here is a general performance data collection script.



User configurable.

Runs in the background.

Steven E Protter
Owner of ISN Corporation
John Poff
Honored Contributor

Re: CIFS High I/O Utilization.


What are the mount options for the filesystems that you are sharing out via Samba?