Hi Thaddeus,Can you add some information? 1. What USB 3.0 to SATA adapter are
you using?2. Or is it a case that the SATA drive or SSD fits into?3. Which
specific SSD are you using? Thanks JohnSent from my Samsung S10
-------- Original message --------From: Thaddeus Waldner <[email protected]>
Date: 2022-06-30 7:47 a.m. (GMT-08:00) To: "Enhanced Machine Controller
(EMC)" <[email protected]> Subject: [Emc-users] Pi4 SSD, MicroSD
use Here are some recent experiences with flash storage on a Pi4 as
adevelopment environment running LinuxCNC 2.8.2.A while back I posted in this
mailing list that using an SSD on the Pi4 isprohibitive because it causes
latency issues. At the time, I tested this ona heavily used, repurposed ssd. I
later discovered that the SSD was failingdue to write wear. This is likely what
caused the latency issues in thefirst place.In the meantime I ran the Pi4 (2GB
memory) as a development platform,running up to 3 instances of VS Code (1.5GB
memory each) along with Glade,browser, etc. This type of usage made short work
of the Samsung EVO microSDcard. The card wear issue first showed up as spurious
latency violations. Abit later the entire system became maddeningly slow and
unusable.Cloning to a fresh sd card solved the problem.In the process of making
backups I also cloned the system to an SSD (intel320 this time) and to my
surprise, it ran with zero latency issues. I willbe using SSDs from now on,
thank you.Some takeaways:1) large page files are bad news for cheap flash
storage2) "worn out" storage will cause latency issue on low latency systems3)
latency tests on a low latency system might be a way to detect flashwrite wear
issues.Thaddeus_______________________________________________Emc-users mailing
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