On 12/7/23 21:56, fedora@xxxxxxxxxxxxxx wrote:
A while back I acquired a NVMe caddy but did not get to use it. I now
did as I got an NVMe disk.
The caddy is
https://www.aliexpress.com/item/1005001346524009.html
Color: 10Gbps M2PV C3
The disk is
1TB WD Blue SN580 NVMe WDS100T3B0E (PCie v4)
I expected to see 1GB/s speed.
Read [X=Y] cable from USB-X to USB-Y. Caddy on left, machine on right.
1) Directly connecting the caddy to the machine (caddy-[C=C]-socket) I
see 36MB/s. So USB-2? speed.
2) Using a caddy-[C=USB3M]-socket I get 442 MB/s. So USB-3.0 speed. This
is expected.
3) The kicker: caddy-[C=USB3M] then [FUSB3=C]-socket (two cables) I get
the expected 1000MB/s.
I tried a few C=C , no change. Two different machines. same.
What I want, of course, is good speed with a straight C=C cable.
Maybe your straight C=C cables don't have the extra pins wired for the
higher speed. What do the logs show for each of those connections?
--
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