[libvirt-users] Performance tuning questions for mail server

[Alex]

Hi,

>> iotop may report as much as 2M/s on the host, with an average of about
>> 400-600K/s. Does that seem like a lot? I can write like 80MB/s at
>> least using dd to test.
>
> I had similar problems previously. The crux in my case is the number
> of IOPS possible. 100K of 2KB file writes is still 2MB/s but requires
> a lot more IO overheads than 1 single 2MB file.

Can I also ask how you measured performance and the effect any changes
you made may have had on the system?

iotop seems very general. Perhaps sar? Ideas for graphing its output?

Thanks again,
Alex