Hi MAlan!
The MSA does not utilize a standard, off the shelf OS. It is purpose built and specifically designed to get the best performance from a fairly modest processor. It is not possible to compare performance of the MSA product to performance of another vendor by hardware alone.
Ultimately the hardware leads to array performance. We have shared the MSA 2050 performance numbers in the MSA 2050 quickspecs: https://h20195.www2.hpe.com/v2/Getdocument.aspx?docname=a00008276enw
Cheers!
/Kipp