Lee,
You asked: "Any ideas on why we are seeing such a difference in
behaviour?"
While IMHO Ed's recommendation is correct - it will help resolve the
problem, it didn't exactly answer your question.
Thirty-two bit Linux in 2Gb of RAM had lots of room to operate. It
was reasonably FD&H and so could handle your 1500+ devices. A Dual Core
64bit machine running WinServ2008R2 in 4Gb of RAM is not swimming in excess
RAM and is most likely even now paging memory.
Say what you will about ROI and the Value of Windows... Given the
same resources and not needing to load a GUI to run, Linux will far
out-perform Windows assuming essentially the same code is in use. [That new
box would probably be awesome running under (free) Debian Linux.] Of course
the Linux installs of IM can't read NT services and so sometimes Windows is
the only option.
_________________
Mike Lieberman
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Konowal, Ed
Sent: Tuesday, January 31, 2012 2:36 PM
To: InterMapper Discussion
Subject: Spam:*******, [IM-Talk] RE: Migrated InterMapper from Linux (5.4.5)
to Windows Server 2008 (5.5.3).
I don't have a good reason, but I've experienced similar problems. Try
lengthening your global poll interval from 30 sec to 1 minute. See what
happens.
Ed Konowal
Lee County School District
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Randy Baker
Sent: Tuesday, January 31, 2012 4:17 PM
To: InterMapper Discussion ([email protected])
Subject: Spam:*******, [IM-Talk] Migrated InterMapper from Linux (5.4.5) to
Windows Server 2008 (5.5.3).
Earlier this week our Server Group created a dual processor, 4Gb of RAM on a
64 bit Windows 2008 R2 Server for us to install InterMapper on. Our legacy
InterMapper configuration was running on a single CPU, 2Gb of RAM on 32 bit
RedHat Linux installation. The two VMs are in the same VM cluster, using
the same Vswitch and network addressing.
Earlier this week I installed InterMapper 5.5.3 on the Windows server and
copied over the data from the Linux server. During the file copying, the
InterMapper services on both systems was shut down. To get the maps, I had
to copy the contents of the Maps/5.4 directory into the Maps/5.5 directory
on the Windows server. Things looked good with the exception that the
Windows Server had a different address than the production version for
obvious reasons, but a number of our devices are configured to only respond
to queries from the production address.
Today, we shutdown the InterMapper services on both systems, performed a
final data copy, and the contents of the Maps/5.4 directory was copied into
the Maps/5.5 on the Windows Server. The Linux server was shutdown, and the
Windows server was reconfigured with the production IP address to take over.
Everything appears normal with one exception. Of the nearly 1,500 devices
we are monitoring, numerous devices are being reported by InterMapper as
having Short Term Packet Loss of 3% to 6% on average. Some devices are
being reported as being down when in fact they are available and accessible.
After checking settings, the performance of the network and server in
VMWare, the server, and other network tools, we see no obvious reasons for
InterMapper to be reporting these conditions. Disabling the Windows
Firewall does not make any improvements.
Any ideas on why we are seeing such a difference in behaviour?
Thank you.
Randy Baker
Network Security Technician
Georgian College, Barrie, Ontario
Georgian College - One of Canada's Top 100 Employers
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