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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'>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 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'>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 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'>Jason.<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>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US 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><span lang=EN-US><o:p></o:p></span></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=blue face=Arial><span lang=EN-US
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><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
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><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:blue'>GLH</span></font><span
lang=EN-US><o:p></o:p></span></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 lang=EN-US
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US 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> henrik@hswn.dk<br>
<b><span style='font-weight:bold'>Subject:</span></b> [hobbit] Dependency sytem
in Hobbit</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US 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 lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'>
|
|<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'>
|
|
|<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US 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 lang=EN-US 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 lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
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