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Out of curiosity, does dd if=/dev/zero of=test.img bs=1M count=954 oflag=fdatasync perform any better?

Damn! That's about as close to a unicorn/match as I've seen in ages. Kudos to @RolloZ170 And, my compliments to Lenovo's P520c engineers, allowing the Think to be separated from the Station ...

[eBay Link] PCIe Gen3 x8 to 2x SFF-8643 (uses a PLX PEX8718 switch)

I wrote You (apparently) checked the block diag of the Asrock Rack epc621d8a. WC621D8A Block Diagram:

You mean 64? Asrock Rack wc621d8a

The 5v & 3.3v are almost certainly acquired/derived, via Buck Converters, from that 4-pin 12v power source.

FYI: If you want more than one, same seller has another listing (qty2 for $300) [Link], which accepts offers, has free shipping, AND (for 2 more days) has a 10% eBay coupon.

That enclosure (the initial version; w/8643 connectors) was/is a connectivity nightmare. Icydock really screwed up! [you've been warned: [disclaimer: which does not obligate me to provide you the gory details, which might then require me to educate you on the specifics, etc. etc. ...]] :) :(...

Are you ignoring the 3 MCIO (x8) connectors for a reason?

Is this a boot_time/POST error? It could very well be a BIOS/SMBIOS limitation (due to build-time #define/parameters). Have you contacted Supermicro? Would be unfortunate to "need" to replace an otherwise suitable platform due to a silly lack of foresight by SM. [( was that "x16" unintended )]

Good try! ... But (now) You're making the assumption :). Because the density you are referencing has NO direct relationship to sequential speed. The density you want is the Recording (or Bit) Density, and you need to look deeper for it, in the Product Specification. [Amusingly, in the section...

Won't sustained writing of data to a pool be severely constrained by the poor write performance (35K * 4KB = 140 MB/s maximum) of the M10 as the ZIL device?

and The specs for this (M10 16GB) are Seq-W 150 MB/s max & 4KB_IOPS-W 35k max. Does that warrant the above quotes?

Is this a fact, or hearsay? If "fact", evidence please ... {assuming RDIMM 2133-2666?) -- thanks

You probably do NOT have the Memory Cooling Kit option, which HP says is "required" for >32GB configurations. [I don't know whether you get a hard-fail @ POST, or just a warning during.]

This drive (MG07 Series) is NOT an Enterprise grade drive. It is Nearline with a spec'd "550 total TB Transferred per Year Workload Rating" Despite the Marketing-Slime literature liberally using the "Enterprise" (and "Cloud") buzzword(s) in many places. [Link] ====== [Hey, Toshiba,] "Don't piss...

Be careful with generalizations. Ceacent has TWO SlimSAS (SFF-8654) 8i to PCIe-slot riser cards, the CNS41CX16I & the CNS41CX16W. The 16I has a standard 6-pin power connector, supplying only 12V, which it draws upon via a buck converter (GS7317) to also get 3.3V (max 5A max 3A) for the slot...

You need a reality-check ... :(

Is this the drive referenced in this thread [Link]? [If so, you should have postponed the FS post till you verified Proof of Life.]

Seller clearly states (3 times) that drive is a "Dell 0RTRG0", but used an image of the HP OEM version. If it is a Dell, note that there is a Firmware Update available. Pretty decent price, in current market (rising NAND/NVMe $) [but not compelling enough, to overcome my "I don't really need...