5 ms·
With the introduction of QLC consumer SSDs, with worse write endurance and life time but the same price as TLC, I took a look at used enterprise SSDs and never
by PixelOfDeath 5y ago
With the introduction of QLC consumer SSDs, with worse write endurance and life time but the same price as TLC, I took a look at used enterprise SSDs and never looked back.
The only issues is the connectors. You need 8x PCI-E lanes (4x might work) or a SAS connector that nearly no consumer board has.
- llampx 5y agoDo you have any recommendations? How does the price per TB compare?
- PixelOfDeath 5y agoI got myself a used pm1725b (PCI-E v3 8x) with 3.2TB for 400€. It hat ~350TB written, and according to Samsung is rated for 3 full device writes per day for 5 years = 17280 TB. So I have some wriggle room left. They use lots of capacitors to hold written data in a dram and flush it out to flash on sudden power down. So they can optimize write operations for speed and low flash wear. Write speed and endurance is the part where consumer SSDs suck more and more ass. Annoyingly many sellers do not put up the written amount of data. But I think that is more out of ignorance and less to try to dump worn down devices.
- fomine3 5y agoU.2 to PCIe mounter or U.2 to M.2 cable is fine.
- PixelOfDeath 5y agoI would not trust a cheap chinese PCI-E to U.2 connector. And used SAS cards become kind of hot and need active cooling. So why not just directly go for a PCI-E SSD?
- shadilay 5y agoQLC is complete trash and should never be used outside of a WORM architecture in a larger pool. That they are trying to force it on consumers is criminal. Same with SMR.
- gruez 5y ago>QLC is complete trash and should never be used outside of a WORM architecture in a larger pool. Not everyone is a creator editing/rendering 4k videos. For the typical surfer/office worker/gamer QLC drives are fine because they rarely need to dump 50+GB of writes at a time. What you're suggesting is basically "ban all atom processors because they're criminally slow!"
- sp332 5y agoI think they were complaining about reliability. QLC cells can't handle as many writes before failing.
- PixelOfDeath 5y agoQLC also has shitty slow write speed. (Slower then linear writes on spinning rust!) So consumer SSDs now depend on a limited dynamic part of flash being used as SLC to cache writes. Just that this dynamic part mostly gets smaller the fuller the device is. And as soon as you do anything with large writes you will hit a brick wall of slowness, on full devices sooner then on empty ones.
- Dylan16807 5y agoThe minimum size of the cache doesn't have to be bad. And I bet the vast majority of people basically never do >10GB writes at >200MB/s.
- PixelOfDeath 5y agoYes many consumers will be fine with this drivers. But the information about the limited write cache never gets mentioned by the manufacturers. So people that actually need to write large amounts of data from time to time, fall into a performance trap.
- Dylan16807 5y agoQLC drives, reasonably designed, can meet most consumer endurance needs.
- wmf 5y agoOr you could... not buy QLC.