"it depends". The v2 box we had back in ~2009 was Intel and Linux on the compute side but SPARC and Solaris for the storage side. It had horrible throughput though for the 1st year or so that we owned it, but it eventually got better after some software upgrades. All the equipment was Sun branded though (except for the Infiniband switches, I think those were Mellanox, but it's been more than a decade so don't quote me)