@Subasically yeah, that's how it works. You just need a SAS HBA (or RAID controller) either on your motherboard or as a PCIe add-in card. A SAS3 controller would be best, but the drives *should* work on an older SAS2 controller as well (someone else will correct me if I am mistaken). If the drives max out the 6Gb/s SAS2 interface you would see a performance impact, however.
I would encourage you to put your VM images on flash storage, but unless you find a really good deal on SAS flash (like these), you might as well go straight to faster NVMe drives. They are not much more expensive - sometimes even cheaper. If you need a lot of storage, however, NVMe drives will get more expensive to attach as you're limited by number of PCIe lanes. SAS and SATA scale better in that sense. If you want to pursue the NVMe option, see if you can find a good deal on Micron 9200 MAX drives. I bought two 1.6TB drives for $140 each just a few days ago on eBay.
As for Plex media storage, spinning rust is probably going to be more economical. Depending on your usage, even slower 5400 RPM drives might work for you, and you'd save on power consumption in the long run. Over SAS or 7200 SATA drives that is. Can't beat the power efficiency of flash storage.
Hope this helps. I am sure other folks will have some ideas, too.
I would encourage you to put your VM images on flash storage, but unless you find a really good deal on SAS flash (like these), you might as well go straight to faster NVMe drives. They are not much more expensive - sometimes even cheaper. If you need a lot of storage, however, NVMe drives will get more expensive to attach as you're limited by number of PCIe lanes. SAS and SATA scale better in that sense. If you want to pursue the NVMe option, see if you can find a good deal on Micron 9200 MAX drives. I bought two 1.6TB drives for $140 each just a few days ago on eBay.
As for Plex media storage, spinning rust is probably going to be more economical. Depending on your usage, even slower 5400 RPM drives might work for you, and you'd save on power consumption in the long run. Over SAS or 7200 SATA drives that is. Can't beat the power efficiency of flash storage.
Hope this helps. I am sure other folks will have some ideas, too.