Random and sequential speeds with IOmeter

[dh41400]

dh41400
can't see u'r point with testing a short-stroked HDD vs a partitioned non short-stroked one through IOMeter,
there obviously shouldn't be any difference at all,
the HDD works the same as when it short-stroked to 30GB or u'r checking the last 30GB in it through IOMeter,
there is no difference at all at arm movement, this test is definitely superfluous.

Actually it's not.

The main reason was to see if a second fully-filled partition would make any impact on the performance of the first one.

It doesn't.

Well it's easy to spot it now that the tests are done

lol, because it's interesting .

Actually disk load (# of Outstanding I/Os- IOMeter Loads) is quite different as opposed to the common knowledge.

This is thoroughly explained at the StorageReview and it can be easily monitored with perfmon.exe:



As seen, the avarage disk load is far from single-digit numbers ... I'm mostly doing an average of 30-50 Outstanding IOPs (a.k.a. Queue depth).


BTW for the other subject - IOmeter results are VERY dependent on the number of workers and type of caching involved ...