On Tue, Dec 12, 2017 at 6:32 PM, L A Walsh <suse@tlinx.org> wrote:
Greg Freemyer wrote:
On Sat, Dec 2, 2017 at 7:40 PM, L A Walsh <suse@tlinx.org> wrote:
The benchmarks are for SSD-drives that take the place of hard-drives -- not motherboard attached ramdisks.
NVMe SSDs are current generation hard drives. They aren't ramdisks in any sense of the word. I bought my first one 2 years ago.
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I've been looking at options for a replacement PC (old one died, ~2 years out of warranty and soldered-on BIOS became corrupt (joy!)). Reading a user guide (https://docs.broadcom.com/docs-and-downloads/host-bus-adapters/pub-005851_20... or https://tinyurl.com/ycnxbkjz) for one of the disk adapter options: a Broadcom (LSI) MegaRAID + HBA card that explicitly supports Tri-mode operation. (Tri=SAS, SATA and PCIe). They describe the supported speeds:
• SAS data transfer rates of 12Gb/s, 6Gb/s, and 3Gb/s per lane • SATA transfer rates at 6Gb/s and 3Gb/s per lane • PCIe (NVMe) data transfer rates of 8 GT/s, 5 GT/s, and 2.5 GT/s per lane Of note: the PCIe "disks" list speeds in terms of memory transfers, not the Gb/s of SAS or SATA disks.
I submit that they *are* non-volatile ramdisks in _most_ senses of the word. I don't see why that is a bad thing, it allows them to have memorythough it would exclude them from sites that are only focused on SATA/SAS based SSD hard drives.
I think we are in a semantics discussion. To me a non-volatile ramdisk is an oxymoron. I also think of a ramdisk as being bootable media. I was just looking at Dell's Pricision line of Desktops. The one I looked at had PCIe cards that held either 2 or 4 NVMe SSDs. It wasn't my impression the MB itself had a M.2 slot. OTOH, my X99 MBs do. Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org