2TB is the largest single unit SSD. It's a Samsung 860 EVO SATA that gets moved between systems a lot, because it contains VMs I need both at home and as I travel with different laptops. Use tray-less hot-swap bays on desktops, DVD SSD-tray carriers on notebooks who have them or a USB 3.1 chassis for the ultrabook variants that don't.
The single biggest logical SSD is currently 4TB created as a RAID0 out of 4 1TB Samsung 860 EVOs. That may grow to 7TB as capacity needs grow, currently stands at around 3TB used. It is treated as cache, not storage. One SATA port is reserved for boot (Samsung 860 Pro 512MB), HDD storage on that box comes off a RAID6 controller, network to backup and workstations is 10GBase-T.
As much as I love NVMe in terms of technology, I find it too inflexible beyond OS drives. Storage is far too dynamic, needs to move and resize in my use cases and U.2 simply nowhere near SATA hot-swap in price/performance.
MLC NVMe has replaced my original MLC SATA SSDs (0.5 and 1TB units currently), TLC SATA established a new cache tier, QLC, especially as NVMe doesn't look compelling in price/performance yet.
I can imagine going to 4TB units in the cache tier (no RAID, no QLC for lack of performance predictability).
I wouldn't mind replacing the HDDs with QLC (even more logic levels for that matter) SSDs at 8 or 16TB capacity points but with a type of RAID or erasure coding that avoids the write amplification of current designs. For that SSDs need to use the SLC cache->xLC transition/garbage collection phase intelligently.
Might keep HDDs for a new backup tier (offline copies), once they reach 20TB capacity points.
The single biggest logical SSD is currently 4TB created as a RAID0 out of 4 1TB Samsung 860 EVOs. That may grow to 7TB as capacity needs grow, currently stands at around 3TB used. It is treated as cache, not storage. One SATA port is reserved for boot (Samsung 860 Pro 512MB), HDD storage on that box comes off a RAID6 controller, network to backup and workstations is 10GBase-T.
As much as I love NVMe in terms of technology, I find it too inflexible beyond OS drives. Storage is far too dynamic, needs to move and resize in my use cases and U.2 simply nowhere near SATA hot-swap in price/performance.
MLC NVMe has replaced my original MLC SATA SSDs (0.5 and 1TB units currently), TLC SATA established a new cache tier, QLC, especially as NVMe doesn't look compelling in price/performance yet.
I can imagine going to 4TB units in the cache tier (no RAID, no QLC for lack of performance predictability).
I wouldn't mind replacing the HDDs with QLC (even more logic levels for that matter) SSDs at 8 or 16TB capacity points but with a type of RAID or erasure coding that avoids the write amplification of current designs. For that SSDs need to use the SLC cache->xLC transition/garbage collection phase intelligently.
Might keep HDDs for a new backup tier (offline copies), once they reach 20TB capacity points.