The SD card will work for file storage but just remember a class 10 SD card will write at 10MB per second or 80Mbps.
The write speed to the cache on a normal rotating disk is 6Gb or 6000Mbps. That is about two orders of magnitude better but that is "cheating" as it is only the interface speed. The sustained sped of the hard drive is only about six times faster than the SD card. Either way the I/O performance of a Pi is rather disappointing. What people do to work around this is keep the files on the hard drives of a "real" computer. They edit those files using the real computer so it is as fast as you are used to. Then when it comes time to run those files they are NFS mounted. So basically you do all the work on the real computer and keep the data there too. These Pis are powerful computers for many uses. They can stream a movie to your TV set. But look at what that means, it takes an hour and a half to transcode and stream a movie. That is so long you could watch a movie while you wait. My point is not to expect a fast interactive experience but when you go to cut metal it will run fast enough to make the mill run at full speed. On Thu, Oct 27, 2016 at 5:36 PM, Gene Heskett <ghesk...@shentel.net> wrote: > On Thursday 27 October 2016 18:57:15 W. Martinjak wrote: > > > On 2016-10-27 23:07, Gene Heskett wrote: > > > I am getting the impression that a micro-sd would have both poor > > > loading performace, call a surveyor to measure write speeds. And > > > poor life in a filesystem environment. SSD w/sata would be good, but > > > the sata on a pi is a bad kludge from what I'm reading. > > > > > > So, Bari, Charles S., etc, what are you folks using? > > > > Hi Gene, > > > > it depends on which performance records you want break. ;) > > > > I suggest going to the next mall, buy a raspberry pi 3, three fast > > micro-sd cards (1st for testing, 2nd for backup and the 3rd for the > > running end version) > > Ya convinced me, but the next mall, from out here in the puckerbrush of > WV, is amazon.com. Its on the way, with free 2 day shipping. 3 32Gb > class 10 micro-sd's too. That should wear level for a while. :) > > > with 16GB (space for wear leveling) and a fast sd card reader. > > As I've heard the 7i90 is on the way. > > Equipped with these arms you can start cnc'ing with pi sized > > ordinateure. :) Then I/we can assist you to setup the whole stuff. > > I'll yelp when it has arrived, probably Monday now as I am tied up and > being held for ransom tomorrow afternoon at the dealer's shop where I > bought a 2007 Toy Rav4, about 5 years and 40k miles back & the brakes > are getting funkity from stuck calipers at 65k miles. And they will > want a fee (the ransom) for that. And I've a window regulator > (electric) to replace in my GMC before it rains seriously. Sunshine > promised over the weekend. :) Now, if my back will co-operate... > > Thanks. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------ > ------------------ > The Command Line: Reinvented for Modern Developers > Did the resurgence of CLI tooling catch you by surprise? > Reconnect with the command line and become more productive. > Learn the new .NET and ASP.NET CLI. Get your free copy! > http://sdm.link/telerik > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ The Command Line: Reinvented for Modern Developers Did the resurgence of CLI tooling catch you by surprise? Reconnect with the command line and become more productive. Learn the new .NET and ASP.NET CLI. Get your free copy! http://sdm.link/telerik _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
