From: Patrick O'Callaghan <pocallaghan@xxxxxxxxx>
On Mon, 2022-03-07 at 23:35 -0500, R. G. Newbury wrote:
Has a 240G SSD for Fedora, and 2 500G nvme ssd's for storage (both in
adapters as the MB has no M.2 slots).
Somewhat OT, but do you notice a difference between the SSD and the
NVMe+adapter combos? I don't have M.2 slots either and wondered if it
made sense for me (I have a good SATA3 SSD already).
poc
I wondered the same thing. And also whether it made a difference which
PCIE x16 slot contained which hardware (including the nvidia GT9700
video card.
I ran a test transferring 3GB from RAM tmpfs to each drive *using
rsync*. That was too small a test to show any substantive difference.
Spurred by your request I ran it again writing 23GB to each storage
unit. I used rsync on a folder containing many various size files as a
real world test.
Transfer 23G using rsync -a
SSD Crucial (2012)
Disk model: M4-CT256M4SSD2
Tue 08 Mar 2022 09:14:41 PM EST
Tue 08 Mar 2022 09:19:38 PM EST
Diff 4:57
NVME0 WD Black SN750 (2019)
Disk model: WDS500G3X0C-00SJG0
Tue 08 Mar 2022 09:19:38 PM EST
Tue 08 Mar 2022 09:22:45 PM EST
Diff 3:07
HD WD Red (2012)
Disk model: WDC WD10EFRX-68F
Tue 08 Mar 2022 09:22:45 PM EST
Tue 08 Mar 2022 09:28:56 PM EST
Diff 6:11
NVME1
Tue 08 Mar 2022 09:28:56 PM EST
Tue 08 Mar 2022 09:31:59 PM EST
Disk model: Samsung SSD 970 EVO Plus 500GB
Diff 3:03
So yes the NVME drives were substantially faster than the (now-old) SSD
transferring in 60% of the time of the SSD.
I expected a greater difference between the 2 NVME drives given that the
Samsung 970 touts a substantially higher write capability.
NVME0 is mounted in a Startech adapter: cost$13.00 Cdn about a year ago.
NVME1 is mounted in a axGear adapter, purchased through Best Buy for a
staggering $10.99 Cdn on sale, with free shipping! So the M.2 plus
adapter cost me $102 including tax. Very happy. Recommended.
Only caveat is that you need a free long PCIE x16 slot (although each
adapter/M.2 only uses x4 for the 4 channels that each M.2 uses. So slot
sharing is not actually a problem as between multiple adapters. I am
going to swap the video card around to see if that might make a
difference although I doubt it will.
Available here until March 10 at $10.99:
https://www.bestbuy.ca/en-ca/product/axgear-m-2-nvme-ssd-ngff-to-pci-e-adapter-m-key-interface-card-m2-to-pci-express/13276627
If you want more storage the Asus Ultra Quad at around $90 will handle 4
M.2 up to 2280 drives and will handle a RAID storage setup.
HTH
Geoff
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