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Operating Systems AIX AIX server problem - network connection is unstable ! Post 303044918 by bobochacha29 on Monday 9th of March 2020 03:50:31 AM
Old 03-09-2020
Quote:
Yes, I understand.

When on a LAN segment you should also realize that every hardware interface to the LAN can have a different characteristic.

Some ethernet cards are more "chatty" and some are less "chatty" and some are "old" and others are "new" and some have drivers / firmware written by "A" and others have drivers / firmware written by "B".

You say "you don't have a lot of knowledge"... that's normal.

So, I am telling you what an experienced network engineer with a lot of knowledge would so.

If I had a busy LAN segment with a lot of devices on the same segment (subnet), as you have indicated, and I had two devices which I wanted to have the best communication speed between them, I would put them on their own LAN segment (subnet) and "be done with it" and maybe "retest" when the two devices are the only two devices (or three if you have a different gateway device) on that segment.
Quote:
Originally Posted by RecoveryOne
This is a pretty large box, a E870 as a matter of fact. Is the network coming from a VIO? If so: Is the VIO network setup correctly? Does the VIO have the correct resource assignments to provide services to however many lpars you have running?

I ask the above because I encountered an issue where the VIO was set up by an MSP and what was happening is every so often the active network path would switch from say c1-p1-t1 to c10-p1-t1. That would cause a momentary ping delay. Much like what you are seeing. My network team was the first to report it to me, as they would see the MAC for the etherchannel device change which port it was reporting on the switch. The item they sent me was %SW_MATM-4-MACFLAP_NOTIF. It was caused by the etherchannel on the VIO having two primary adapters and no backup adapter. Taking one of the primary adapters and moving it to the backup adapter fixed the issue. Your results may vary.

If they are dedicated adapters and not coming from the VIO, again check your AIX configuration. Something to note, your tcp_recvspace and rfc1323 are not consistent with your adapters. That might be by design, but gives me pause that network wasn't set up correctly.

Now, everything else that everyone has posted here comes into play as well, and I'm not a network admin so I cannot weigh in on the other topics presented here.

Push comes to shove, start a ticket with the IBM AIX team.
We're running with full resources, no VIO.

We've asked network team to recheck the network. We are also planning to upgrade OS to 7.1 to get help from IBM.
 

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SYSTEMD-NETWORKD.SERVICE(8)				     systemd-networkd.service				       SYSTEMD-NETWORKD.SERVICE(8)

NAME
systemd-networkd.service, systemd-networkd - Network manager SYNOPSIS
systemd-networkd.service /lib/systemd/systemd-networkd DESCRIPTION
systemd-networkd is a system service that manages networks. It detects and configures network devices as they appear, as well as creating virtual network devices. To configure low-level link settings independently of networks, see systemd.link(5). systemd-networkd will create network devices based on the configuration in systemd.netdev(5) files, respecting the [Match] sections in those files. systemd-networkd will manage network addresses and routes for any link for which it finds a .network file with an appropriate [Match] section, see systemd.network(5). For those links, it will flush existing network addresses and routes when bringing up the device. Any links not matched by one of the .network files will be ignored. It is also possible to explicitly tell systemd-networkd to ignore a link by using Unmanaged=yes option, see systemd.network(5). When systemd-networkd exits, it generally leaves existing network devices and configuration intact. This makes it possible to transition from the initrams and to restart the service without breaking connectivity. This also means that when configuration is updated and systemd-networkd is restarted, netdev interfaces for which configuration was removed will not be dropped, and may need to be cleaned up manually. CONFIGURATION FILES
The configuration files are read from the files located in the system network directory /lib/systemd/network, the volatile runtime network directory /run/systemd/network and the local administration network directory /etc/systemd/network. Networks are configured in .network files, see systemd.network(5), and virtual network devices are configured in .netdev files, see systemd.netdev(5). SEE ALSO
systemd(1), systemd.link(5), systemd.network(5), systemd.netdev(5), systemd-networkd-wait-online.service(8) systemd 237 SYSTEMD-NETWORKD.SERVICE(8)
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