On Thu, Jun 2 at 20:49, Erik Trimble wrote:
Nope. In terms of actual, obtainable IOPS, a 7200RPM drive isn't
going to be able to do more than 200 under ideal conditions, and
should be able to manage 50 under anything other than the
pedantically worst-case situation. That's only about a 50% deviation,
not like an order of magnitude or so.
Most cache-enabled 7200RPM drives can do 20K+ sequential IOPS at small
block sizes, up close to their peak transfer rate.
For random IO, I typically see 80 IOPS for unqueued reads, 120 for
queued reads/writes with cache disabled, and maybe 150-200 for cache
enabled writes. The above are all full-stroke, so the average seek is
1/3 stroke (unqueued). On a smaller data set where the drive dwarfs
the data set, average seek distance is much shorter and the resulting
IOPS can be quite a bit higher.
--eric
--
Eric D. Mudama
edmud...@bounceswoosh.org
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