> Tristan Ball wrote:
> > I believe Zpool iostat will include cached IO's,
> and write IO's which will be coalesced into a single physical IO to your
> disk.
<p>
> > The plain "iostat" command is a good place to start to see what's actually
> > going to disk. "iostat -dxzcn 1" is what comes out my fingers
> > automatically, although I vary the interval, and
> often add "CM" the options.
<p>
> I believe that 'zpool iostat' also shows only what is
> going to physical disk, just like regular iostat.
<p>
> If you want to judge the effect of caching, compare the stats from 'fsstat
> zfs' (or 'fsstat /mountpoint' to isolate a particular dataset) against the
> zpool iostat numbers. When I watch fsstat during heavy write activity, such
> as an incoming backup, I see a steady stream of writes with fsstat, but only
> periodic bursts of writes with zpool iostat or plain iostat.
<p>
Thanks, I didn't know how to look into fs access stat.
<p>
--
Roman
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