In a message dated: Mon, 23 Dec 2002 11:32:12 EST
mike ledoux said:
>Is this different somehow from the %util field in 'iostat -x'?
The %util field will probably suffice, however, it appears to require
a kernel patch for it to work (note, RH stock kernels already have
the patch applied) and I can't seem to find the actual patch (after
only 30 seconds of looking in /pub/linux/sct/fs/profiling/ where the
'sysstat' web site states it should be). I'll find the patch and
play with it. It might suffice for the people who care/are pestering me :)
>> The interesting thing is that iostat will tell you how many requests
>> per second were made, and how much data per second was transferred,
>> but there is no correlation between the two; i.e. I know how many
>> requests were made, but not the size of those requests.
>
>'iostat -x' gives you an average request size. You don't actually want
>to know the exact size of each individual request, do you?
Well, no, average size might suffice.
>> Therefore, I have no idea what percentage of requests is represented
>> by the amount of data transferred.
>
>100%.
100% of the requests made, or 100% of the requests serviced? Of the
number of requests made per second, how many were actually completed?
Obviously the amount of data transferred == number of requests per
second completed. However, there may have been more requests made,
than were completed. How do you measure that delta?
--
Seeya,
Paul
--
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