-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Monday, 2017-12-04 at 08:31 -0500, Greg Freemyer wrote:
On Sat, Dec 2, 2017 at 7:40 PM, L A Walsh <suse@tlinx.org> wrote:
Greg Freemyer wrote:
That's because the controller includes a standalone bios. NVMe doesn't use a separate bios. The main bios has to have NVMe support if you want to boot off of it.
For that reason, I wouldn't call them hardware-based drives. From your description, it's memory that is physically attached via a PCIx interface to the motherboard, no?
It is the same storage chips your SATA SSDs use. The hold data even when disconnected from power.
The SATA interface chips are replaced with PCIe interface chips. In legacy SSDs, the SATA interface chips are the throughput bottleneck, not the storage chips.
Memory attached to the system motherboard, used to be how memory was designed into the system before CPU speeds were so much faster than MB speeds (mostly gen-1 PC's and computers before that).
The website I cited, doesn't consider them in its bench marks as they aren't hard-disk compatible (can be thrown in another pc to boot from, as 1 example).
That's like saying "SATA drives aren't hard drives. My 1999 era PC doesn't have SATA ports, so they aren't portable between all PCs."
I work with my client PCs routinely. 10 in the last 2 weeks. 2 of those 10 had exclusively NVMe SSD for storage.
It may be leading edge now, but it isn't bleeding edge any longer.
fyi: I think my first client owned PC with NVMe storage was in 2015. At the time, I had no idea they would show up as /dev/nvme0n1, etc.
As I understand it, and explained on another mail list in Spanish, these NVMe disks which connect to the PCIe bus have in effect direct access to the data and address buses in the bus, meaning that in effect you address them as memory. More or less. This is why accessing them is so fast. Not all are that fast, though. Isengard:~ # hdparm -tT /dev/sda /dev/sda: Timing cached reads: 2818 MB in 2.00 seconds = 1409.00 MB/sec Timing buffered disk reads: 1352 MB in 3.00 seconds = 450.59 MB/sec Isengard:~ # Model=KINGSTON SMS200S3120G It is in fact and "ssd msata" disk, not an NVMe - -- Cheers, Carlos E. R. (from openSUSE 42.2 x86_64 "Malachite" at Telcontar) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEUEARECAAYFAlolkBUACgkQtTMYHG2NR9VOCwCdHGXUaQxaRXQg1wqxnqY6hCJd rdgAl33f6OB1/KbR8zuZtnBbL8UAimI= =sDDk -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org