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Date: Wed, 14 Apr 2004 15:02:25 -0400
From: Aditya <aditya@grot.org>
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Subject: read/write disk bandwidth monitoring?
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iostat can provide an aggregate number for transactions per second and Bytes
per transaction for a given device, but if it is a block device, is there a
counter accessible from iostat or elsewhere that I can see how much is read
transactions versus write transactions?

> iostat -K -d -I 1
             ad0              ad2              da0            pass0
  KB/t xfrs   MB   KB/t xfrs   MB   KB/t xfrs   MB   KB/t xfrs   MB
  0.00   0  0.00   0.00   0  0.00   0.00   0  0.00   0.00   0  0.00
  7.50   8  0.06   0.00   0  0.00   0.00   0  0.00   0.00   0  0.00
  0.00   0  0.00   0.00   0  0.00   0.00   0  0.00   0.00   0  0.00
  0.00   0  0.00   0.00   0  0.00   0.00   0  0.00   0.00   0  0.00
^C

tells me transactions per device, but not divided into reads versus writes...

Adi