Re: [opensuse-factory] NVMe based laptop?

3 Jun 2016


      On Fri, Jun 3, 2016 at 10:31 AM, Johannes Thumshirn  wrote:
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On Thu, Jun 02, 2016 at 04:21:22PM -0400, Greg Freemyer wrote:
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On Thu, Jun 2, 2016 at 3:56 PM, Andrei Borzenkov  wrote:
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02.06.2016 16:27, Greg Freemyer пишет:
=== M.2 M Key device using AHCI protocol ===
Samsung XP941 SSD PCIe M Key 2280
MZHPU128HCGM-00000
AHCI is _not_ NVMe!!!
While that is true ...
...
AHCI is SATA.
... this is not always. M.2 storage can be connected either using SATA
to HBA on motherboard or it can be connected using PCIe to PCIe switch
on motherboard. In the latter case it can either contain AHCI
compatible controller *on M.2 card itself* or it can contain NVMe
compatibel controller. In both cases host interface is still PCIe
which provides advantage over plain SATA.

The above card seems to be AHCI over PCIe, so no SATA :)
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That's the trickery with the M.2 Slot. It can be SATA, USB or PCIe.
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$120 from Amazon
JFTR I've made good experiences with the following Samsung M.2 NVMe:
# nvme list
Node             Model                Version  Namepace Usage                      Format           FW Rev
---------------- -------------------- -------- -------- -------------------------- ---------------- --------
/dev/nvme0n1     SAMSUNG MZVPV256HDGL 1.1      1         26,26  GB / 256,06  GB    512   B +  0 B   BXW72H0Q
Yes, and this one is NVMe (NVM over PCIe).

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Do you know if a PCIe adapter card has to support AHCI vs NVMe, or
does the PCIe card just connect the PCIe bus pins to the M.2 connector
pins and could careless what protocol is in use?
As far as I know in case M.2 AHCI over PCIe everything is implemented
on M.2 card itself, and it just needs pure PCIe interface.
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