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If there's no internet service

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  • Tbrondolo
    replied
    Re: If there's no internet service

    Steve,

    I've used mobile broadband modems for short outages. The ones I use all provide up to five wifi connections, the only thing is that your client systems have to be on Wifi or you have to do a bridge between the existing router and the Wifi modem. Otherwise I would think a local server with database replication services running to the main server.

    Tom

    Leave a comment:


  • Steve Workings
    replied
    Re: If there's no internet service

    Thanks for everyone's thoughts on this.

    In both of these cases, the apps feature terrific mobile capability, thanks to A5. Our current thinking is that in nearly every circumstance, *some* mobile connection will be available -- if not through an iPad's AT&T service then through a smartphone's "other" service. Then we just need the rest of the 'net and ISP to be up, and we have good experience with that already. So, for now we're doing nothing different but I wanted to cast a net to see what else we might consider.

    Leave a comment:


  • Chet Sapino
    replied
    Re: If there's no internet service

    Originally posted by Steve Workings View Post
    I have two customer suddenly with important apps that will likely need to make accommodations for a loss of internet service, for a day or few days. Most of these interruptions can be "planned" with today's weather forecasting but not every one of them.

    I Googled around, and didn't really find much on a strategy to deal with this. So, my question:

    Are there ideas, schemes, things others have done to help keep users of a web-based database system working until the 'net comes back up? Then, of course, update the data when service is restored?

    The best thing I can think of is a desktop/laptop A5 app that makes it easy for the user to download the critical stuff for any expected outage, then makes it easy to upload new/changed data afterwards.
    You can probably use replication. When the internet server comes back on line it can catch up with a Master server running elsewhere with the latest data. The slave would have to be the internet server and the master database located on another server. You can do this with MySQL. I have three MySQL servers - One Master running with two slaves. I'm entering data on the Master which is up all the time. The two slaves are shut down periodically. When they come back on line they catch up to the master. All three databases are in sync. I don't have to run any code to do this. It is virtually automatic. Pretty easy to set up.

    You have to be careful you define the replication users on the slave and Master as DBA's temporarily, if you are developing an application on the Master.

    Leave a comment:


  • cavj1
    replied
    Re: If there's no internet service

    Questions...are each of the applications hosted in house by the customer? Are you hosting them for the customer? If your hosting and that is a requirement then you should move them to a service provider that provides you with a managed server for your use. Think of something like Rackspace where they provide you a server in the cloud. These companies are fully redundant and should provide you with what you need.

    If that is not an option then you need to have redundant internet connections. It cannot be two cable pipes, it must be from different carriers using different technologies. For example. We bring in 2 20MB Fiber pipes. Each comes out of a different CO on different carriers. Then for extra resiliency we use a standard cable connection. You'll need a firewall that can handle multiple pipes and be capable of putting the different circuits in a HA pair.

    Leave a comment:


  • christappan
    replied
    Re: If there's no internet service

    I know nothing of it, but I remember reading a post on here related to SQLite and up- and down-time. Might help.

    Leave a comment:


  • Clipper87
    replied
    Re: If there's no internet service

    It is something they are looking/working at for their upcoming mobile framework. I have no further details.

    Leave a comment:


  • bobalston
    replied
    Re: If there's no internet service

    Steve

    This might be a case where new Access 2010 & Sharepoint capabilities would have an advantage. YOu could build an access app and store the data on Sharepoint. Each user would use the App using Access on each local PC. they can even use it disconnected from the internet, as it automatically syncs a local copy of the data with the master in Sharepoint.

    But realistically, when you architect a web app, you need to allow for when the web app is not functional for various reasons. In my experience, the interim practice is to manually save data to enter and change until the app is once again available. for information that needs to be retrieved, I found it common to create reports or local data files, tables that can be queried for reference only.

    YMMV

    bob

    Leave a comment:


  • pettechservices
    replied
    Re: If there's no internet service

    @the-mage its called Replication... I'm not OVERLY familiar with it, but I've used it to back up a live site to a second back up site in case the main site goes down..

    Leave a comment:


  • bobalston
    replied
    Re: If there's no internet service

    @clipper87

    so what does that mean?

    Bob

    Leave a comment:


  • Clipper87
    replied
    Re: If there's no internet service

    Steve,

    HTML5 has local storage features for when you're offline. Alpha is very aware of that...

    Leave a comment:


  • The Mage
    replied
    Re: If there's no internet service

    How do you reconcile the databases if you switch back and forth? (Just wondering, as I am still learning databases.)

    Leave a comment:


  • pettechservices
    replied
    Re: If there's no internet service

    I sorta "mis-spoke" earlier.. I should have said dbserver/WAS... as the WAS is the web server in itself.

    WAS can only be installed on one server. I would "assume" here that IF a software package is critical for a client, they would be willing to purchase an additional WAS license (because they'd also be spending money on a backup server, etc) for contingency purposes.

    Gandhi, yes, WAS can be installed without AlphaFive being installed, but only on 1 server.

    Leave a comment:


  • GGandhi
    replied
    Re: If there's no internet service

    hello

    i am confused about the WAS setup. i thought you can have only one installation of that license for all to reach out and get the data(for unlimited license) so that license will reside on the server. and then if you have local installation then only one computer can access that WAS which is installed on that computer. outside users can not reach that WAS since unlimited license is activated somewhere else. since you can install alpha five on two machines only, two computers can be a local backup if the setup is web server/db/WAS locally. is my understanding correct? so what will happen if more people need to access the data? can this WAS be installed on other machines without alpha five being there? it is all greek to me. i am unable to understand. can someone explain how to do this?

    Leave a comment:


  • pettechservices
    replied
    Re: If there's no internet service

    Steve, what is the database back-end? You may be able to set up a local configuration (as someone else was suggesting) where the webserver/db/WAS is local, and have replication set up so that the local DB and web-db are always in sync.

    If connectivity is lost, they can open a local version of the application, and then when connectivity is restored, the db is usually sync'd automatically and they can switch back to the internet app... or if this is a frequent occurance, they can always use the local application, have it sync to a remote db for replication to other "local" sites..

    just a thought.

    Leave a comment:


  • GGandhi
    replied
    Re: If there's no internet service

    The best thing I can think of is a desktop/laptop A5 app that makes it easy for the user to download the critical stuff for any expected outage, then makes it easy to upload new/changed data afterwards.
    hello

    i think that is the best approach. there is a web based pos system - lightning POS that uses an emergency module, that does exactly same thing, i think.( i have no personal knowledge the information page states the mechanism)
    the following is from their page

    "Since Lightning Online Point of Sale is contingent on your stores internet connection, what happens if your store, or our multiple servers, experience a connectivity issue? We have that covered!"

    Leave a comment:

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