Hi Migrate,

I have a question about LUN size vs number of LUNs when you need to create a filesystem for SAS datasets, especially in performance perspective.

Assume we need a 4TB capacity file system to hold SAS datasets, we could:

Create 1 LUN with 4TB size;
Create 2 LUNs with 2TB size each;
Create 4 LUNs with 1TB size each,
Create 8 LUNs with 500GB size each;
etc.

It's understandable that different storage types (and/or different file system types) might have different approach or formula.
But as a general rule, in performance perspective, to create a big filesystem for SAS datasets, do you prefer bigger LUN size with fewer LUNs, or smaller LUN size with more LUNs.

Thanks in advance,