[twiddlebits]

In my experience, on most SSDs/NVMEs, the firmware GC destroys performance under a heavy read/write load to the point of being no better than a mechanical HD of yore. Except Samsung and Intel. But Intel SSDs have bricked on me a lot. So now I just use Samsung NVMEs exclusively.

[PragmaticPulp]

This article tests that. Read down to the "Sequential Drive Fill" section.

[Jon_Lowtek]

I would love to see some test how SLC caches interact with dmcrypt / mdadm / lvm - there are a lot of old rumors i believe are outdated by now

[the8472]

Probably depends on whether you configure your storage layers to pass through TRIM commands.

[Jon_Lowtek]

yes, that would be my guess, too

[numpad0]

The version of explanation I have read is that it's SLC cache getting saturated(same deal as CMR cache region in DM-SMR except read/write can parallelize), and that it won't happen with enough cache amount and fast, parallel writes, so explanation differs but solution sounds right

[mandis]

interesting. Can you elaborate a bit on the problem? Perf downgrade to the level of HDD is crazy