Re: Time to update the hardware

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On Tue, 2022-03-08 at 22:53 -0500, R. G. Newbury wrote:
> > 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.

Thanks for the detailed info. My current SSD is a Samsung 860 EVO (2TB)
so for comparison I did this:

$ time dd if=/dev/zero bs=1G count=23 of=Big
23+0 records in
23+0 records out
24696061952 bytes (25 GB, 23 GiB) copied, 14.9873 s, 1.6 GB/s

real    0m15.087s
user    0m0.000s
sys     0m14.640s

However that's clearly not a reflection of actual I/O speed as the
writes will have been cached.

poc
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