You missed one important factor which is RAID
In case 24 SFF 10K SAS drives, there could be many possibilities. You need to consider RAID and Power of 2 as well.
In 2nd condition little impact will be there where any volume created from Pool where 15K drives paritcipated, performance will be little faster. Again VDG RAID level matters here as well.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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