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Re: [pS-dev] Conclusions and Open Issues for Errors/Drops Schema


Chronological Thread 
  • From: Roman Lapacz <>
  • To: David Schmitz <>
  • Cc:
  • Subject: Re: [pS-dev] Conclusions and Open Issues for Errors/Drops Schema
  • Date: Mon, 06 Aug 2007 13:52:29 +0200



... or if you want we could update datum element of 'nmwg' namespace

for example:

<nmwg:datum value="234567890" valueUnits="octets">
<nmtm:time type="unix" value="1021119880"/>
</nmwg:datum>


but it should be the same for metrics the we use and store in rrd files.

Roman



Roman Lapacz wrote:

I'd like to ask about datum element. For the utilization it looks like this (taken from example response):

<nmwg:data id="d1" metadataIdRef="meta1">
<nmwg:datum timeType="unix" timeValue="1121558400"
value="0.19281761856741222" valueUnits="Bps"/>
<nmwg:datum timeType="unix" timeValue="1121644800"
value="0.1621709219533064" valueUnits="Bps"/>
<nmwg:datum timeType="unix" timeValue="1121731200"
value="0.34163606985698564" valueUnits="Bps"/>
<nmwg:datum timeType="unix" timeValue="1121817600"
value="0.3812493124312431" valueUnits="Bps"/>
</nmwg:data>


In http://anonsvn.internet2.edu/svn/nmwg/branches/snmp/example_instances/errors/SDResponse1.xml I see that 'error' namespace is used for datum. Do we really need this new namespace here. Why not use just 'nmwg'. Datum of 'nmwg' namespace is generic for values of both metrics (utilization and errors) stored in rrd files.

I propose to use only 'nmwg' namespace for datum element.

(the same with discards)

Roman


David Schmitz wrote:
Hi all,

from the discussions in the last week about the new schema for the Input Errors/Packet Drops MA the following conclusions were drawn:

For the implementation which will start soon on Monday
the schema described by the following example instance and rnc files
will be used:
http://anonsvn.internet2.edu/svn/nmwg/branches/snmp/rnc/errors.rnc
http://anonsvn.internet2.edu/svn/nmwg/branches/snmp/rnc/discards.rnc
http://anonsvn.internet2.edu/svn/nmwg/branches/snmp/example_instances/errors
http://anonsvn.internet2.edu/svn/nmwg/branches/snmp/example_instances/discards

This version of the schema is similar to the already existing schema for
the utilization MA.


In the future a new version for the schema will be used, which will be a unified approach comprising any possible metric covered by SNMP data
collection, i.e. utilization, input errors, drops, and any further SNMP metric.

The development of this later used schema version is ongoing work.
Currently, there are the following open issues:

- use of supportedEventType parameter instead of eventType element in store file (metadata config file).
- support of multiple event types in one metadata block?
- new time formats for select parameters, in addition to UNIX/ISO formats
- issues concerning the chaining of metadata elements

Regards,
David






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