Intel Optane Memory log device compatibility

[RubenKelevra]

Phoronix wrote over the general compatibility of Linux with the new Optane Memory from Intel.

I was wondering if somebody did some testing of Log-Device compatibility, does it honor the write barrier and hold all data or does a power loss result in data loss on those devices?

The very high 4k write performance should be very interesting for log-devices for hypervisors as well as database servers with 8k record sizes.

Is zfs currently optimized to quickly write 4k/8k to the log devices and concat it to larger chuncks for slower harddrives/ssds? Or is there no performance benefit, because it just buffers peaks while the disks still have to write small chunks?

[problame]

@RubenKelevra you might be interested in #12731