Hi Martin, Good links. The other issue I've been fighting for some time, and one reason for the Pi4 is a backup server.
For now the Pi4 c/w Mesa7i92 and a couple of break out boards has been great for on the bench testing for my CAN bus based power draw bar. Project also on hold for now. I'm using Windows Home Server (WHS) to back up the various computers but it can't do my Wife's MAC nor the Linux systems on the next. What WHS has(had) going for it was the complete reconstruction of the system after replacing a hard drive. This includes all the special secret keys for licensed software. Not an issue for Linux because no one wants to put the licensed software on it anyway so a pure file by file backup works well for Linux. With WHS, insert a CD into the PC with the new hard drive. It boots from that and finds the server. You then select which PC and which back up date you want restored. Hours later when it is done the system boots as if it was never broken. Saved my bacon a few times and much cheaper timewise compared to re-installing all sorts of software files etc and reconfiguring. At worst you lose the day the system failed. But WHS is no more. Not sure why. Anyway the size of the hard drive I have on the workstation now I think keeps breaking it. An older laptop died last week and I've not been able to reconstruct it. Hence the idea of using an RPi4 with battery backup for clean shutdown, fan and a 4 TB hard drive is appealing. However the work involved in setting up such a server seems overwhelming. But first a Pi4 must be able to talk to one or more large hard drives. John > From: Martin Dobbins [mailto:tu...@hotmail.com] > I didn't actually pull the trigger at 1 cent because I somehow? thought it > might not ever get here. I'm > sometimes amazed at what people get up to with RPIs: > > https://domipheus.com/blog/raspberry-pi-4-pci-express-it-actually-works-usb-sata-gpu/ > > https://geekworm.com/products/raspberry-pi-4-model-b-x825-2-5-inch-sata-hdd-ssd-expansion-board > > Maybe you don't have to use USB after all? > > https://lemariva.com/blog/2019/09/raspberry-pi-4-ssd-booting-enabled-trim > > Martin > > > > > ________________________________ > From: John Dammeyer > > Hi Martin, > Just got an email that mine has shipped but no tracking info just yet. > > My 16mm reamer finally arrived so I can get back to the Harmonic Drive > project once I get the S100 > computers off the table saw and all the boxes off the floor. Kind of a mess. > > And then I was foolish enough to buy this bare board and order parts. The CF > holders also finally (ordered > in April) arrived. But I have to write the disk drivers for these and that's > turning out to be a bigger problem > than I originally thought it would be. When done the CF cards replace 8" > floppy disks for a Z80 based > computer. (Yes. 8" floppy that at single sided single density hold a > whopping 243K bytes) > > John > > > -----Original Message----- > > From: Martin Dobbins [mailto:tu...@hotmail.com] > > Sent: June-30-22 8:14 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Pi4 SSD, MicroSD use > > > > Hi John, > > > > That gives me 99% off as a new user bonus, so I would have to pay them US$ > > 0.01 with free shipping > > estimated delivery August 29th <lol> > > > > Martin > > > > ________________________________ > > > > > > Really don't want to pay amazon.ca $25 for that sort of cable since they > > likely all come from the same > > place. > > > > https://www.aliexpress.com/item/32991882020.html > > > > This one is only $5 Cdn with free shipping and I can wait until August for > > it. > > > > John > > > > > > > > > > > -----Original Message----- > > > From: John Dammeyer [mailto:jo...@autoartisans.com] > > > Sent: June-30-22 1:32 PM > > > To: 'Enhanced Machine Controller (EMC)' > > > Subject: Re: [Emc-users] Pi4 SSD, MicroSD use > > > > > > I'm going to guess it won't work with the small KingSpec 8GB that is > > > marked on the board "7PSATA-1" > > > > > > John > > > > > > > > > > -----Original Message----- > > > > From: Thaddeus Waldner [mailto:thadw...@gmail.com] > > > > Sent: June-30-22 10:43 AM > > > > To: Enhanced Machine Controller (EMC) > > > > Subject: Re: [Emc-users] Pi4 SSD, MicroSD use > > > > > > > > I am using this cable: > > > > > > > > StarTech.com SATA to USB Cable -... > > > > https://www.amazon.com/dp/B00HJZJI84?ref=ppx_pop_mob_ap_share > > > > > > > > > > > > > On Jun 30, 2022, at 11:33 AM, johnd <jo...@autoartisans.com> wrote: > > > > > > > > > > ?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 > > > > > <thadw...@gmail.com> Date: 2022-06-30 > > > 7:47 > > > > a.m. (GMT-08:00) To: "Enhanced Machine Controller (EMC)" > > > > <emc-users@lists.sourceforge.net> > > 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 > > > > listEmc-users@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/emc-users > > > > > _______________________________________________ > > > > > Emc-users mailing list > > > > > Emc-users@lists.sourceforge.net > > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > Emc-users@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
