Examining disk block IO on Linux.

[David Collier-Brown]

On 07/17/2014 02:41 PM, Jeremy Allison wrote:
> Just got pointed at this:
> 
> http://www.brendangregg.com/blog/2014-07-16/iosnoop-for-linux.html
> 
> looks interesting.... Maybe useful for Samba performance
> tuning ?


Nice for several tasks, including seeing how much unrelated IO loads
increase Samba's latencies, which is important when the problem isn't Samba.

I'd compare latencies of the disks with response times of Samba overall
at increasing loads in IOPS, in hopes of saying something like "each
additional X IOPS after the first Y will slow the system by 0.Z
seconds", for a given disk configuration.

--dave

-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb at spamcop.net           |                      -- Mark Twain