On Thursday 09 January 2020 21:08:27 R C wrote: > On 1/9/20 5:41 PM, Gene Heskett wrote: > > On Thursday 09 January 2020 19:13:56 R C wrote: > >> if you use USB connected drives on a Pi, and also the network, > >> you're switching > >> > >> between eth/wifi and USB "A LOT" (it uses the same > >> hardware/chipset). If you power the > > > > No wifi, its disabled. > > But are you using ethernet, the wired connection? > Yes, for my inhouse net. And its my understanding that usb stuff and all the other do no longer share common hdwe.
> >> drives through USB that is not a good thing. For modest amounts of > >> data I just use a/the > > > > I have a 5 amp supply, and these adapters have no provision for > > external power. However, one should never forget that that, and a > > couple bucks will get you a fresh cuppa most anyplace but Starbucks. > > ;-) > > It's not about the power availability really, the issue is it > switching back and forth between USB/network in an ARM arch, there > is no real way > > for switching priorities, buffering AND keep devices powered/running. > When you use the network, the USB part gets ignored, almost shut off, > and > > the other way around. ARM is more about streams, unlike interrupt > things where "devices" keep being powered and given priority. > > > So network IO might shut your disk off.. and then back on.. a lot. > an SSD uses between 1.5W-2.5W I believe, which in PI terms is a lot. > An SD card > > on the other hand just uses a tiny fraction of that and it can handle > that, like your phone and your camera, iPod etc etc > > >> SD card (the video/photo ones can handle a lot more writes than > >> standard ones) or I use NFS > >> > >> when I need larger data sets). > >> > >> > >> (I run a seismograph on a PI, it does data collection, and 24/7 > >> sends data to a database > >> > >> every 1-2 seconds and never had issues.) > >> > >> > >> > >> Ron > >> > >> On 1/9/20 10:24 AM, Gene Heskett wrote: > >>> Greetings all; > >>> > >>> Back in the middle of May 2019, I ordered, from newegg.com, three > >>> 240GB SSD's and 3 rosewill usb-3.1 to sata adapter cables so I > >>> could use them as std drives on my pi's. > >>> > >>> All of the rosewell adapters have now died. Called newegg, got run > >>> around, hit tigerdirect and had 4 startech's at about 5 bucks more > >>> ordered in less that 5 minutes. We'll see how they work. > >>> > >>> So right now newegg and rosewill are bad kharma to me. > >>> > >>> Cheers, Gene Heskett > > > > Cheers, Gene Heskett 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
