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U.2 Questions. Help Please

E

Elf_Boy

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Nov 16, 2007
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Hi all, as always thank you for all the positive helpful answers in advance.

I have been reading about m.2 and u.2 ports.

Pretty nifty.

In reading about the u.2 ports specifically I have run into several articles that state how the dives can stack.

Nothing explained exactly how that works.

Is it like SCSI when the second plugs into the first etc? This would be neat if, lego like, they can be snapped together and share the single port.

I suspect that reality probably falls short of my hopeful dream.

Just to be clear. Yes I understand that would mean shared bandwidth between the devices.

Thank you all.
 
Nothing like that exists at the moment so far as I'm aware. You can have adapters that will bifurcate PCIe lanes so that they can be split amongst more devices, but nothing like daisy-chaining drives. For the most part, you're only going to see U.2 in servers anyway (though there are some exceptions).
 
Blue Fox said:
Nothing like that exists at the moment so far as I'm aware. You can have adapters that will bifurcate PCIe lanes so that they can be split amongst more devices, but nothing like daisy-chaining drives. For the most part, you're only going to see U.2 in servers anyway (though there are some exceptions).
Click to expand...

Thanks!

Being able to Mount one atop the other and split the cable is almost as nice, kinda-sorta.

Being able to daisy chain either with a short cable, or literally by plugging one on-top/behind the last would be pretty nifty.

Save on cable nightmares. I am guessing in a server environment the drive enclosures could be engineered to fit just right in the right 1u/2u (is case the right verbiage? I dont have much server experience) would be very nice.

I have an LSI HBA, I am using raid BIOS (of course) in the other bios it can do something like 255 drives. That must be a cabling nightmare. Being able to run one cable, preferably optical, to each would be nifty.
 
Backplanes make cabling easier. There are single chassis that will hold 90 SAS/SATA drives and only require a single external cable to be attached. As for NVMe drives, you can get high density in servers too. Supermicro produces a 2U server that holds 48 2.5" hot-swap NVMe drives for example.
 
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