iostat source of information

[William Muriithi]

Hi

I am wondering, is iostat performance statistics influenced in any
manner by the lvm or filesystem or are they extracted from interaction
between the hard disk and operating system via the device drivers? I
have noticed something, if I run iostat, it does detect the device
instead of the volume. That made me suspect that these statistics are
for a device level performance. So, I undertook a bit of googling but
can not see an article that explicitly state that.

Anyway, I then decided to throw it here just in case one of us may be
in the know of where iostat read from. I have looked at the iostat
code and it content are from the proc file. But where the operating
system collect this information from elude me.

Regards,

William
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