[hobbit] Dependency sytem in Hobbit

[Rich Smrcina]

I wrote about this some time back, the depends tag doesn't appear to 
work properly.  You can specify a router (which is just another host) 
that things depend on, and that works.  But a multi-level dependency 
(which depends seems to try to provide) would also be a good thing.

Stef Coene wrote:
> On Friday 19 January 2007 15:56, Hubbard, Greg L wrote:
>> Etienne -- you are going to have to find someone to write that and add
>> it to Hobbit.  Path-based alarm suppression is one of the holy grails in
>> the network management industry, and the reason it has not yet been
>> solved is because it is a difficult problem.  For small networks you can
>> come up with a solution, but if you are using VLANs and WAN's and load
>> balancers and all that other stuff it gets to be rather difficult.
>>
>> There are many commercial software vendors that claim to have this
>> problem solved -- but sometimes even their demos do not work.  The
>> little bit of dependency specification that you can put into Hobbit does
>> indeed work, but not across the board.
> As fas I know, the hobbit _server_ can do this for the network tests.  All 
> network tests are done in 1 run.  The data is processed and dependencies are 
> calculated and errors are generated.
> 
> The problem is client checks.  When an error is received, the hobbit server 
> needs to check it's dependencies.   But some of these dependencies are also 
> client checks that are maybe not (yet) received.  So the server can never 
> know for sure if all dependencies are satisfied.
> 
> The only way I can imagine this to work is if all checks are send every 5 
> minutes.  So, when a red check is received, the server waits 5 minutes untill 
> all checks are updated and it can starts checking the dependencies.
> 
> But what with checks that are send every hour ?  And do you really want to 
> wait 5 minutes?
> s
> 
> Stef
> 
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> 

-- 
Rich Smrcina
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