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If the spinners were at 40% then performance was definitely impacted. I’d
be shocked if you managed to get SSD into double digit percentages with the
same workload. NvME would even be lower that the SSD.

Really what you care about is not busy, it’s wait times by applications.
If the applications are not waiting on I/O then no problem. If they are
then you have a problem to solve.



On Fri, Mar 24, 2023 at 2:43 PM Rob Berendt <robertowenberendt@xxxxxxxxx>
wrote:

Coworker asked me: "Percent of what?". The help on percent busy says it
takes in "characteristics of the type of disk unit".
Based on that, might that mean that the same percent busy goals do not
change?

Of course, shop floor people look at 100% as a goal to strive to hit. Just
means you're getting your money's worth out of the equipment. :-)

On Fri, Mar 24, 2023 at 2:26 PM Kirk Goins <kirkgoins@xxxxxxxxx> wrote:

If I remember correctly, Spinning disks should be at or below 40% for
best
I/O performance. I want to say that for SSDs that number could be higher.
Can SSDs be busier than 40% and what is their % Busy goal?

Thanks
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Kirk - KG0INS
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