| Title: | DECmcc user notes file. Does not replace IPMT. |
| Notice: | Use IPMT for problems. Newsletter location in note 6187 |
| Moderator: | TAEC::BEROUD |
| Created: | Mon Aug 21 1989 |
| Last Modified: | Wed Jun 04 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 6497 |
| Total number of notes: | 27359 |
I have an urgent problem with DECmcc v1.1 on VMS, which will
potentially loose us network management in a large UK bank. We have
DNS V1.1 on VMS, on a single node.
The problem is that on a regular and cyclic basis, we are getting
"No such entity" being reported for entities that do exist, and which
will be there the next minute. This is seen at its clearest when
trying to enable rules, where on moment a rule is there, and the next
an equally valid rule is not there. If the set of commands is re-run,
(via @... at the MCC prompt), then maybe all rules will be OK, maybe
others will be reported as "No such entity".
Careful investigation shows that there is a clear 2 minute cycle to
this behaviour, where every 2 minutes the "No such entity" message will
be reported for 4/5 seconds, and then everything goes OK again. It is
as though something is being locked out, too busy, .... on these
occasions, but we can't see any obvious jobs, processes or DECnet
links. On the later, it does seem that if the node is disconnected
from the network, then no errors are reported - but then it is not much
on a network management station!! We believe that this error is
disabling rules in some way also.
This behaviour is giving rise to customer nervousness as to the
stability of the product, and making it impossible to deploy on a VERY
important testing / pseudo-production role.
Any clues, suggestion to get to the bottom of it?
Thanks,
Jeff
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2615.1 | Need more information | MOLAR::ROBERTS | Keith Roberts - DECmcc Toolkit Team | Tue Mar 24 1992 07:31 | 17 |
Jeff,
(Q) Exactly what are you (your customer) trying to do ?
o What Rules are you creating (what is the Rule Expression) ?
(Q) Which command is giving the 'no such entity' error message ?
o Is it the Create or Enable Rule directive?
o Or an error returned by Alarms when you do the
'Show All Status' directive ?
Any additional information you can provide will help us sort this out.
Thanks,
/keith
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| 2615.2 | How many DNS servers? | TEMTY::MINTZ | Tue Mar 24 1992 07:46 | 5 | |
This is also one of the symptoms of problems with DNS.
Is there more than one DNS server in the namespace you are using?
-- Erik
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| 2615.3 | One namespace, two competing implementations!! | SHIPS::SMITH_J | Jeff Smith | Thu Mar 26 1992 07:43 | 32 |
I believe that I have got to the bottom of the problems being experienced at
Barclays with DECmcc.
DECmcc is blameless, DECdns (Distributed Name Service) is giving rise
to the problem but is blameless. The problem is that there are two
DECdns nameservers operating on an extended LAN using the same
namespace name (BARCLAYS:), but which have not been told about each
other.
The people who 'own' the DECdns namespace knew about one server, but did
not know about the other. The other people did know of the namespace
plans etc., but did not seem to understand what was required of them when
configuring their system.
I believe that MCC was using DNS quite happily. Then (every 2
minutes), the rogue DNS server advertised itself via the Ethernet, and
caused great confusion, and MCC lost contact with the real DNS server
momentarily. At that time, I think it was linked to the rogue DNS
server, and hence found that things that once were there, were now no
longer registered.
Bottom line: The software did not have a problem, but there was a lack
of co-ordination over the network on the implementation of DECdns.
Even if you think you have an implemenation plan for DNS it is all too
easy for someone to bring up another server and cause grief.
Thanks to all who helped on this,
Regards,
Jeff
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