Thank you very much for the answers.
I would like to know if there is a IOPS performance difference between configuration a) and configuration b) below:
a) Pool A -> DiskGroup1 (4 x 300GB 10K SAS RAID5) + DiskGroup2 ( 3 x 300GB 10K SAS RAID5) = 1500 GB
b) Pool A -> DiskGroup1 (7 x 300GB 10K SAS RAID5) = 1800 GB
Does configuration b) allow more space available and best IOPS performance?
If I add a single 400GB SSD as a cache, does this cache allow the MSSQL DBs hosted in the Pool A volumes performance to be greatly improved? 70% of works of these DBs are read-only.
Otherwise I could buy 3 x 400GB SSD, delete and re-create everything as follows:
- Pool A -> DiskGroup1 (8 x 300GB 10K SAS RAID5) = 2100 GB
- Pool B -> DiskGroup1 (2 x 400GB SSD RAID1) = 400 GB
- Global Spare -> 1 x 400GB SSD
Is it possible to use 1 x 400GB SSD as Global Spare for both SSD DiskGroup and 300GB 10K SAS DiskGroup?
Thanks a lot
Paolo