https://www.theregister.co.uk/2018/01/12/storage_area_networks_patches_spectre_meltdown_bugs/

Analysis Is the performance sapping spectre of the X86 Spectre/Meltdown bug fixes hanging over SAN storage arrays? The general assumption is "yes" but five suppliers say not.

You would expect SANs to need patching; they run their controller software on X86 servers after all.