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The sequential numbers are pretty close to spec for the drive. The random 4k Q32T1 is 250k IOPS, below what the drive can do, but pretty good for a single thread (this test is CPU bound). Probably need to get to at least 4 threads to start maxing out random read. Random 4k Q1T1 looks good.
I'm guessing it's for compatibility with existing/legacy infrastructure that is built around SAS/SATA tooling and asking their customers to move to NVMe tooling is too disruptive.
If reliability is the top concern, I would order the oldest drive I can find from a reputable supplier and make sure I have the latest FW. Basically, a drive where everyone else found the bugs already.
1.) Based on the description it sounds like you can mix SATA, SAS and NMVe drives on them? Is that accurate?
At the same time? I have never tried this. I only have experience with NVMe.
2.) They have some sort of large wide, but slim port on them. Is this the same as the so-called "slimsas"...