The Netview server already run named: It is a secondary dns server and
therefore run the same dns as everywhere on the network
What you are suggesting is that it should run a dedicated dns that would be
customized for my needs. The problem I see is that it would be difficult to
keep in sync with all the change that we have in the DNS and would
basically have to maintain the DNS twice.... unless I can generate the dns
files automatically.
Presently our hosts file is generated from an export from the production
dns server (oracle database of a management product exported into a text
file). is there some good software out there able to re-create the dns
files from an hosts file ?
Thanks,
Salutations, / Regards,
Francois Le Hir
Network Projects & Consulting Services
IBM Global Services
Phone: (514) 205 6695
Date: Tue, 25 Mar 2003 17:17:07 -0600
To: nv-l AT lists.tivoli DOT com
From: Stephen Hochstetler <shochste AT us.ibm DOT com>
Subject: Re: [nv-l] name resolution on Netview server
Message-ID:
<OFB2AB7B3A.F9833968-ON86256CF4.007F55FE-86256CF4.007FAB44 AT us.ibm DOT com>
Have you tried running DNS on your own NetView server so that you don't
have the performance hit of a large /etc/hosts file?
You would need a hostname to resolve to a single IP address...but all
addresses to resolve back to a single hostname. This would help your CPU
usage quite a bit. The administrative work would not be unlike what you
are already doing for your /etc/hosts file.
Kind regards,
Stephen Hochstetler shochste AT us.ibm DOT com
International Technical Support Organization at IBM
11400 Burnet Road Austin, TX 78758
Office - 512-838-6198 (t/l 678) FAX - 512-838-6931
-------------------------------
Date: Tue, 25 Mar 2003 17:35:53 -0500
To: nv-l AT lists.tivoli DOT com
From: "Francois Le Hir" <flehir AT ca.ibm DOT com>
Subject: Re: [nv-l] name resolution on Netview server
Message-ID:
<OF796D9D74.292F8B9B-ON85256CF4.007B1030-85256CF4.007C22C9 AT pok.ibm DOT com>
I agree that others applications could suffer too. However adding entries
in the host file is the only solution I found in order to make sure Netview
keep a coherent name for each of the node instead of changing it between
the names of the different interfaces as resolved by the DNS.
If every entries resolve to the same name, then Netview always use this
name as the selection name of a node, even when we delete and rediscover
it. As I can not change entries in the DNS, the host file is the only
solution I know of. The need to have a unique name for a device is
especially important now that we are trying to integrate with a ticketing
system and unique ids have to be created for every device.
In my situation, only syslogd was taking the CPU of the server: out of 4
CPUs, syslogd was taking 100% of one or 25% of the total server. The
average load of the server (including syslogd) was 35%. (We are receiving
about 650 MB of syslog data per hour from the network)
Maybe syslogd is badly written (and Netview daemon very well written), I
don't know, but none of the Netview daemons did show a degradation in
performance.
Now, did any of you try using the NSORDER variable to make Netview use a
different name resolution order than the rest of the system ?
Thanks,
Salutations, / Regards,
Francois Le Hir
Network Projects & Consulting Services
IBM Global Services
Phone: (514) 205 6695
Date: Tue, 25 Mar 2003 15:14:27 -0500
To: nv-l AT lists.tivoli DOT com
From: James Shanks <jshanks AT us.ibm DOT com>
Subject: Re: [nv-l] name resolution on netview server
Message-ID: <OFDC60B65C.18EA499F-ON87256CF4.006EBAF1 AT us.ibm DOT com>
What makes you think that netmon, trapd, snmpCollect, and nvcorrd, just to
name a few daemons which do many gethostbyaddr calls will not have the
same problem that syslogd does? Sooner or later, they will. gethostbyaddr
/ gethostbyname is a system call, and if it is slow for one process, it
will be slow for all.
James Shanks
Level 3 Support for Tivoli NetView for UNIX and NT
Tivoli Software / IBM Software Group
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