Those are just examples I have shown but yes to get max performance you should go for RAID10
For me Option 1 looks fine.
I would like to correct Option 2 only at the SSD portion because you need to consider "power of 2" for data,
Option 1 (two symmetric Pools): Pool A -> 2*12 SAS Disks Raid 10 + 3*SSD Tier Raid5 /|||\ Pool B -> 2*12 SAS Disks Raid 10 + 3*SSD Tier Raid 5 /|||\ 2* Global Spares
Option 2 (two asymmetric pools): Pool A -> 2*16 SAS Disks Raid 10 + 3*SSD Tier Raid5 /|||\ Pool B -> 1*16 SAS Disks Raid 10 + 3*SSD Tier Raid5 /|||\ 2* Global Spares
Now you need to decide as per your business requirement and future needs.
Hope this helps!
Regards
Subhajit
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