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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hello all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>After another deep look into Hobbit
mechanisms, it looks like the idea of using the combo tests to create a tree
structure is good and you can link that structure to the alerts. This is done
by putting rules that are based upon combo tests since they are considered as
standard tests (with an historic, statistics …). <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Now the idea would to stop the alert
floods triggered when a critical device on a path falls down. The tree structure
helps gathering all the necessary informations into one test. We can now
trigger alerts on those alerts preferably than on common bb-hosts tests, but
the flood still remains. It remains because you have to trigger alerts on each
combo tests to know exactly where it has failed. And since all your combo tests
are involved whenever a failure occurs at some point the following nodes will
be unreachable in this case:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>A - 1 - 2 - 3 - F<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If anybody has an idea he is welcome …
</span></font><font size=2 color=navy face=Wingdings><span style='font-size:
10.0pt;font-family:Wingdings;color:navy'>J</span></font><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Etienne Marganne,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>TI Automotive.<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Jones, Jason
(Altrincham) [mailto:JasonAS_Jones@mentor.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> vendredi 19 janvier 2007
17:10<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">hobbit@hswn.dk</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [hobbit] Dependency
sytem in Hobbit</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Ok, have just read this
E-mail but I thought that if you did the route tag on a host it only went
yellow (unreachable by proxy) if itself and a device in it’s route entry
failed (i.e. if the gateway fails but the host still responds to ping then it
stays green) though Henrik would have to confirm this as I haven’t had
such a situation. Also I’m curious how the CPU, hard drive etc,
dependencies would work? If CPU on host1 has a high load what effect would that
have on host2? Unless of course a database was being hosted by host1…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Also can I ask, how large
is this network? Henrik’s is ~4000 or something ours is about 400-500.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Jason.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Hubbard, Greg L
[mailto:greg.hubbard@eds.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> 19 January 2007 14:56<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">hobbit@hswn.dk</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [hobbit] Dependency
sytem in Hobbit</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>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.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>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.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>GLH</span></font><o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Marganne,
Etienne [mailto:emarganne@be.tiauto.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, January 19, 2007
5:58 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">hobbit@hswn.dk</st1:PersonName><br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">henrik@hswn.dk</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [hobbit] Dependency sytem
in Hobbit</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am Etienne Marganne, a new comer in TI Automotive, a
society which uses Hobbit as a monitoring tool, I will be in charge of Hobbit
tool. We would like to enhance our monitoring tool in order to get more
detailed informations through it.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>One of the first thing we would like to do is to create a
dependency system between monitored hosts across our network. For all the
further discussion, please keep in mind that we have a very large network and
two Hobbit servers where we would like to keep the same “hh-hosts”
file. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The idea of the dependency system is the following one: once
we have a host that fails on a network path in our network all the hosts
further that one will be very likely unreachable. This will cause a lot of
alerts to be triggered because of one failure. This is not interesting because
our team will be flooded by those alerts. Therefore it could be useful to
create dependencies so that those further devices on the same path will not
trigger alerts (basically turning red).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>There is a specific tag that can be used to do such a work,
the “route” tag. In our case with two Hobbit servers, we would tune
that with the “route_BBLOCATION” tag. Knowing that there are Hobbit
clients on all the network nodes between the two endpoints, the simplest idea
would be to list all the nodes in the description of those tags. This could
work even if it would generate of job. A little bit further here, let’s
say that one node fails on a path, it is very probable that if you know that
the following nodes are unreachable, you may not want to test them anymore (to
forbid them to turn red). <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Now think of a big network with a lot of redundancy, it is
very probable that there will be indeed a lot of network paths between a server
and one final host. If on one path one node fails, it does not mean that the
final client is not reachable. But with the “route” tag, that
client would be signal as unreachable since a member of the “route”
has failed. This is not comfortable at all. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>What we would like to know, or to get, if there is a way to
get this dependency system work: <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hobbit Server A ---- 1 ---- 2 ---- 3 ---- 4 ---- Final
Client<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
|
|<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
| --------- 5 ------------6 ----------- | <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>There are two paths to reach the Final Client, one composed
by 1, 2, 3, 4 and another one composed by 5, 6. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>With the current “route” tag we would have such
a list of nodes: route_HobbitServerA:1,2,3,4,5,6 then if 1 fails and the path
1-2-3-4 would not work anymore but the 5-6 one would still. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>A good dependency system would to have such a thing: Final
Client depends on 4, 4 depends on 3, 3 depends on 2, 2 depends on 1 but Final
Clients also depends on 6 which depends on 5. More over this would also solve
that kind of topology :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hobbit Server A ---- 1 ---- 2 ---- 3 ---- 4 ---- Final
Client<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
|
|
|<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
| --------- 5 ------------6 ----------- |
Where there is a link between
2 and 5, 2 and 6, 5 and 3, 6 and 3.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Maybe that something could be set up with the
“depends” tag, however I do not know how the informations will
propagate through the different dependencies done that tag.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Even further on the topic, the “route” tag
performs only ping tests which does not seem enough to me. I would like to add
cpu, disks, … tests to the whole dependency system.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you for your help and answers,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Etienne Marganne<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>TI Automotive.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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