I'm not sure, I'm using the MQTT driver so for me it doesn't matter as I'm not directly interfaced with the weewx hardware. I've ordered a couple more PI's so I'll let you know how it turns out. I know I can attach a drive to one of the pi's and have it accessible to the swarm. My ideal is to have the frequently updated information writing to an SSD attached to my cluster so I can really push the limits of the longevity, so that the SD cards are really only to allow the cluster to boot and then the rest will be driven from the SSD. I will have it on a UPS as well.
On Tuesday, 14 November 2017 08:11:43 UTC-5, Tom Keffer wrote: > > Interesting idea. Can a docker swarm work for a hardware device? I've > always thought of them as responding to HTTP requests. > > I have not tried a thumb drive. My original intention was to try different > drive configurations, but I need the SD card to die first and free up the > instrument and RPi. After 3 years, I'm still waiting.... > > -tk > > On Mon, Nov 13, 2017 at 7:26 PM, Robert Mantel <[email protected] > <javascript:>> wrote: > >> Great stuff Tom, I had to abandon my Pi as it was starting to get flakey >> and locking the database. I totally ported it to my freenas box in a VM >> for now, but my goal is to get 2 more Pi 3's and create a docker swarm with >> all three nodes as master nodes. That way if I loose one, it stays up and >> I can replace the bad card without interruption. We're going to be >> building an off grid house so this will be the brains of the house >> (including the weather and home automation) so it's going to have to be as >> bulletproof as possible. I may connect an SSD to it just for extra storage >> but keeping the power consumption small will be the key. >> >> Have you tried using USB thumb drives? I think there is a way to run the >> OS from them so that the SD card gets minimal reads/writes because they do >> not have any real mechanisms to balance writes across the media like some >> thumb drives and SSD's do. >> >> On Saturday, 4 November 2017 09:17:40 UTC-4, Tom Keffer wrote: >>> >>> I've now had an Sandisk Extreme Plus SD card running on a Raspberry Pi >>> B+ for nearly 3 years straight without a problem. >>> >>> http://www.threefools.org/weewx/status/index.html >>> >>> And, today marks one year of continuous uptime for weewx in this test! >>> >>> There are two conclusions to making these cards work: >>> >>> - Get a good one. I know it seem ironic to spend $30 on storage for >>> a $35 computer, but it makes a big difference. >>> - Use an Uninterruptible Power Supply (UPS). It doesn't have to be a >>> very big one, but expect to spend another $50. >>> >>> So your $35 computer, once it's kitted out with a power supply, WiFi >>> adapter, UPS, and memory card, is more like a $150 computer. >>> >>> But, the good news is that it's not necessary to buy a hard drive. >>> >>> Incidentally, in the one year that weewx has been up, it's memory usage >>> has grown from VIRT 49.7MB to 52.7MB, RES from 32MB to 39MB. It has used >>> almost 1136 hours of CPU time, for an average duty cycle of about 13%. >>> >>> -tk >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
