Re: From SSD to NVME
On 12/5/24 09:59, Michael Stone wrote:
> On Thu, Dec 05, 2024 at 09:42:08AM -0500, eben@gmx.us wrote:
>> Is it different when you boot from an nvme drive? I have what I was
>> told was one and it appears as /dev/sdb or /dev/sda depending how the
>> OS feels that day. I didn't buy it new, it was given to me, so I may
>> have been misinformed. It's a thing that looks like a SIMM, and when
>> it's plugged in the motherboard disables one of the SATA ports, which
>> is unfortunate.
>
> That is a SATA SSD, not an NVMe.
Interesting, thanks. Apparently either it was misrepresented to me, or I
misremembered. That explains some stuff.
> The SATA drive letters can change based on things like which drive starts
> up faster or what removeable devices are plugged in, which is why using
> UUIDs or somesuch is preferred over using the device name.
And that probably explains why it's always sdb under a rescue thumb drive,
because that environment doesn't automount _anything_.
> SATA maxes out at 600MB/s, while PCIe is currently at 4000MB/s per lane,
> with NVMe drives typically using as many as 4 lanes [16000MB/s].
How do I tell how many lanes a given drive uses (preferably before purchase)?
> For many [most?] consumer applications the differences will not be
> noticable.)
Yeah, I probably wouldn't be able to tell. It's just geek points. I was
thinking it might matter when xferring gigabyte+ files to the media server,
but then the bottleneck would either be the CPU encrypting the SSH data, or
the network itself.
Is one kind more long-lived than the other?
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