On Wed, 2006-06-14 at 09:10 -0600, Joshua Gimer wrote:
You can use iostat which is part of the sysstat package.
yum install sysstat
You can set up an interval and a count and have it redirected to a file for later reference
iostat 10 20 >> filename
But tapes are character devices and iostat only shows block devices. If there isn't much else happening the read values on the source drive might be close enough, though.