SQL SERVER Database IO performance impact of splitting database tables into FileGroups and multiple Files per filegroup
Talk with your SAN administrator. That's the source that should be able to explain you with detailed information what kind of SAN you've got and what it is capable of. Have you got MPIO? What's the structure of your fabric?

Sometimes it makes sense to use multiple LUNs for different files. Behind the scenes, there might be different types of storage available.

A SAN with some SSD capacity might offer tiering. That is, the hottest data is elevated to SSD -backed part of the system whilst colder data is persisted on HDDs. Some models provide autotiering, in which the system decides what's hot and what's not. Some models require administrative action.

HP EVAs provide VRAID levels 0, 1 and 5. Using those will spread a LUN on all the disks in an array. This increases reliability, but the cost with VRAID 5 is increased controller CPU usage. The SAN admin needs to balance increased storage costs against increased CPU usage.

Aligning NTFS blocks with storage is dependent upon the SAN. If you are in addition using virtualization (Hyper-V, VMWare, whatever), that's additional complexity introducec. Your storage vendor is likely to offer white papers, best practices and consulting services about how to configure the storage for optimal performance.

Network packet size is relevant - if you use iSCSI. For FibreChannel, IP settings are not relevant.