From owner-freebsd-fs@freebsd.org  Sun Oct 15 07:20:45 2017
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Date: Sun, 15 Oct 2017 18:12:59 +1100
From: Paul H <freebsd@pkholm.com>
To: freebsd-fs@freebsd.org
Subject: 3D xpoint AKA Optane as ZIL/L2ARC
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G'day, Mates

I'm not sure to what mailing list this message really belongs too. ( 
Hardware or this one).

Does anyone done any real world benchmarks of Optane memory with ZFS? It 
is new type of memory different from normal DRAM or flash. 32Gb and 16GB 
M.2 modules are currently available for < 100 USD. It makes it quite 
attractive as small boost for ZFS.  Looking to just a specification 
using it as L2ARC does not make much sense, good M.2 SSD will be faster 
on random reads. But ZIL is a different story, SSD is not great as ZIL 
due to write amplification and fact that you need to TRIM data. XPoint 
seems to be performing really well on random small writes. This is type 
of load i would expect to see on ZIL drives.

I could couple of pages internet about 3D XPoint and ZFS, but they are 
all really amateurish.  Can anyone point me on some more solid testings.

WBR

  Paul