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  • tommylight
18 Feb 2026 21:58
Replied by tommylight on topic HDD vs. SSD

Why TrueNAS over FreeBSD?

(I know TrueNAS is based on FreeBSD, but still)
It's not, new version is Debian as far as i can gather from the boot time info.
  • tommylight
18 Feb 2026 21:57
Replied by tommylight on topic HDD vs. SSD

I have never seen a motherboard with more than 4 SATA ports.
I've always had with more than 4 as they also had a separate SATA controller with RAID, still have 2 with 6 SATA ports, and all Enterpise towers also have 6 or 8 ports (HP Z420 and Z600)
  • David-Diy
18 Feb 2026 21:54
Replied by David-Diy on topic Hydraulic press brake control
Yes I will, I did take some photos and know what's the system PLC/System they use, I'll have to come back I hope later today to upload some photos about it.
18 Feb 2026 21:35
Replied by on topic HDD vs. SSD
Does HDD cache size have any impact?
  • rodw
18 Feb 2026 21:26
Replied by rodw on topic HDD vs. SSD
HDD read/write has no impact on latency.which measures hardware performance, network latency is important for mesa/ethercat systems.
The buffering of gcode will be sufficient to cover HDD speed.
Using a SSD is  a great boost in performance and I usually install one when refurbing a machine. Recently I didn't on a 8 core i7 & I really noticed how much longer Debian took to install. 

Use the one you say is ideal
18 Feb 2026 21:24
Replied by on topic HDD vs. SSD
Why TrueNAS over FreeBSD?

(I know TrueNAS is based on FreeBSD, but still)
18 Feb 2026 21:21
Replied by on topic HDD vs. SSD
I have never seen a motherboard with more than 4 SATA ports.

I don't really need NAS, though that is a cool idea, I suppose.
  • tar_san
18 Feb 2026 21:20 - 18 Feb 2026 21:22
Replied by tar_san on topic Ver 2.9.4 iso clean install Trouble when disabling EOE
This is a snapshot of latency of that PC when I tested servomotors.

I'll try exact same former procedures ( I have written something important about disabling eoe, and recalling everything as much as possible ) with former PC today.

Thank you so much for your every skillful reply.
 
  • snowgoer540
18 Feb 2026 21:20
Replied by snowgoer540 on topic Qtplasmac Run From Line
I tried to run through this and see what I could see, with your partial cut file being a mess, it's hard for me to guess at where you are trying to start and what is going on. Can you post the actual cut file?

Also, what version of QtPlasmaC are you running? need the entire number in the window header.
  • tommylight
18 Feb 2026 21:19
Replied by tommylight on topic HDD vs. SSD

500GB WD Blue HDD (16MB cache) (The ideal choice, I have like 6 extra ones)
Get an old mainboard/CPU/MEM and plug all 6 to it, see bellow

256 SanDisk SSD (I only have 4).
Use for LinuxCNC machines, much better latency/access times compared to mechanical drives, and much faster.

500GB WD Blue HDD (32MB cache) (Less plentiful than the 16MB caache drives, but I don't really need this drive for anything).
Use this one to install TrueNAS and plug it into the same old PC mentioned above with the other 6 drives, you get a nice 2.5TB NAS with fault tolerance for one failed drive.
  • tommylight
18 Feb 2026 21:12
Replied by tommylight on topic Poll to See Who Still Uses RTAI
I do a lot, older versions (no idea what the number is), and i replied to the other post regarding Xenomai.
Thank you.
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In short, i do not necessarily need the latest version, either of RTAI or LinuxCNC, i stick to what reliably works.
18 Feb 2026 21:11
HDD vs. SSD was created by
I am planning to install LinuxCNC 2.9.8 for a parallel port setup (I know Wheezy is probably better, but I need it to be as user-friendly and modern as possible).

I have a bunch of disks I can install it to:

500GB WD Blue HDD (16MB cache) (The ideal choice, I have like 6 extra ones)
256 SanDisk SSD (I only have 4).
500GB WD Blue HDD (32MB cache) (Less plentiful than the 16MB caache drives, but I don't really need this drive for anything).

Which drive would be the best choice for latency.

Bootup time is irrelevant to me, latency is really my only concern.

I will use this PC almost exclusively for machine control, except to download nc files perhaps.
  • tommylight
18 Feb 2026 20:59 - 18 Feb 2026 21:07
Replied by tommylight on topic Xenomai 4 Poll
FYI, Mesa Ethernet does not work with RTAI kernel, so either way you look at it, RTAI was/is for software stepping mostly.
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Edit:
Personally i have in use a lot of parallel port machines, mostly with Ubuntu 10.04 still, and some new ones with Mint 19.2 and RTAI kernel, but i have much more with Mesa boards, and still i would say not to bother much with it as most of those machines with parallel port do not need the latest and greatest, the ISO for Ubuntu 6.04, 8.04, 10.04, and Wheezy are still available for download and all come with older versions of RTAI kernels.
  • AlessandroEmm
18 Feb 2026 20:21 - 19 Feb 2026 06:11
Replied by AlessandroEmm on topic Remora - Rpi Software Stepping Using External Microcontroller via SPI
So Axis starts, and remora.SPI-status is true too. Resetting the MCU actually throws SPI Errors. I think that looks fine. Unfortunately I can't toggle the emergency switch.

I looked at the PRU-reset pin and its on FALSE. is that how it should be? Am I missing something obvious?

I'm just using the standard HAL configuration from the doc:
Code:
net user-enable-out <= iocontrol.0.user-enable-out => remora.SPI-enable net user-request-enable <= iocontrol.0.user-request-enable => remora.SPI-reset net remora-status <= remora.SPI-status => iocontrol.0.emc-enable-in

Thanks, Alessandro
  • Bari
18 Feb 2026 19:00 - 18 Feb 2026 19:01
Xenomai 4 Poll was created by Bari
Since RTAI has reached the end of its life the way forward might be   Xenomai 4 

How many users might find this useful? it will be lots of work and we aren't sure yet how to support Mesa cards with it yet.
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