Hi,
Let's detail, for example, 3 different applications i want to monitor (in
reality, I have almost 60)
For the 3 applications, we have the following metrics(this is an overview):
Application 1:
- Number of SQL updates executed
- Number of SQL updates per second
- Number of failed operations
- State
Application 2:
- Number of messages received
- Number of messages processed
- Number of messages processed by second
- Number of pending messages
- State
Application 3:
- Number of threads
- Number of active threads
- Number of operations processed by thread
- State
Each application can be launched on several databases and can be launched
multiple times (for performance reasons) on each database.
Let's imagine I have a MIB containing a list of servers (by using a
SEQUENCE). My problems are:
- How can I define specific caracteristics (different for each server) with
a generic MIB?
- If, in the manager console, I have four instances of the same server:
- Application1 on database DB1 (First instance)
- Application1 on database DB1 (Second instance on the same database
for performance reason)
- Application1 on database DB2 (third instance)
- Application1 on database DB3 (Fourth instance)
All these servers are subagent (AgentX).
If the manager executes a get of 'State' for the first instance, how does
the master agent ask the correct subagent about the metric?
>From: "Dave Shield" <[EMAIL PROTECTED]>
>To: "Arnaud BODENAN" <[EMAIL PROTECTED]>
>CC: [email protected]
>Subject: Re: How can I extend a MIB with a subagentX
>Date: Tue, 18 Jul 2006 20:28:06 +0100
>
>On 18/07/06, Arnaud BODENAN <[EMAIL PROTECTED]> wrote:
>>I want to know if I can avoid creating hundreds of MIBS to monitor
>>specific
>>applications with specific metrics.
>
>That sounds as if you need to define a fairly generic MIB structure,
>that can handle the various specific metrics within a single fixed
>framework.
>
>
>>By dynamically adding, I mean:
>>- dynamically create a metric in a MIB
>
>If the metric is defined as a table (or tables), then this equates to
>adding one or more new row(s). That's a perfectly reasonable
>approach. Creating completely new MIB objects on the fly is a much
>less workable approach.
>
>
>>- instrument it (by dynamically set a callback to retrieve the value of
>>this
>>metric) so that I can do an snmpget on this dynamic metric
>
>That's no problem - using either new rows in a fixed tables or
>completely new MIB structure. Just register the row or subtree with
>the master agent.
>
>But there are two sides to this sort of dynamic updating - it's not
>simply a matter of instrumenting the agent to report the new value.
>You've also got to inform the management application (or network
>manager) that there *is* a new value to retrieve, and what it means.
>If you're working with new rows in a fairly generic table, then that
>would be fairly easy - it's just a matter of walking the table as
>usual. But if you are defining completely new MIB objects on the fly,
>how is the manager to know about them?
>
>
>I would *strongly* recommend looking at a fairly flexible but fixed
>MIB framework, with separate rows (or groups of rows) for each
>application. You might well end up with a relatively sparse table,
>where only selected columns are valid for a given application - see
>the DisMan expression MIb for one possible approach.
>
>I'm not sure whether that is necessarily the best approach - perhaps
>you could give us something more concrete to work with. Consider two
>typical applications - what are they, and what are the metrics you'd
>want to be able to report for them? That might be an easier way to
>start designing the sort of general structure it sounds that you'll
>need.
>
>Dave
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