Plan looks fine to me as you are aware of little Performance impact due to imbalance of drives in same tier VDGs.
Only thing I want to mention that there is no need to unmark SAS drive at slot 19 and remark at Slot 10. You can simply move the drive from Slot 19 to Slot 10. It's about drive metadata where the information already written and the drive knows that it's purpose is to be used as spare drive.
Final will be,
Slots 1-4 / 4x1.6tb ssd (raid 5)
Slots 11-14 / 4x1.8tb sas (raid 5)
Slots 5-8 / 4x1.6tb ssd (raid 5)
Slots 15-18 / 4x1.8tb sas (raid 5)
Slot 9 1.6tb ssd (Global Spare)
Slot 10 1.8tb sas (Global Spare)
Slots 19-21 / 3x1.6tb SSD (Raid 5)
Slots 22-24 / 3x1.8tb SAS (Raid 5)
Hope this helps!
Regards
Subhajit
I am an HPE employee
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