How To build a 19″ Server Rack

Every serious consultant and technichian walks through this phase of having his private test environment and wants to bring whatever environment to live. In the former days this was occasionally heavy iron, piling up to some extend and everybody had somehow to handle the hardware.

Today virtualisation and the meltdown in memory pricing helps. Entire companies may be simulated virtually in little more than an PC. What doesn’t change is communications and given the fact that nice replication or virtulisation technologies sometimes shall work over a far stretched wide area connection. So the today home lab looks first compressed in a Continue reading

25th Anniversary of HAHN Automation

Last weekend, bether from thursday to saturday, my employer held his 25th anniversary. now you may consider myself as an overachiver, blogging on my private website about that. But the enourmous feeback we got and the two remarkable key notes I heared, made me reconsider this, and I want to share some of these impressions.

Besides the keynotes of course there had been speeches and buffets and polititians speaking … you name it. On the other hand we partnered with some of our suppliers to give some state of the art impression on robotics, such as Festo with the Butterflies or Schunk with the bionic hand.

Besides the current state, the audience was inspired about the future of robotics first in the speech of Dr. Hubert Zitt, a lecturer at the FH Kaiserslautern/Zweibrücken who relates quite frequently the science in science fiction to the real world and current technical Continue reading

How To Configure IRF on HPE FF5700

Approaching a certain quality level of switching and routing, high availability evolves to be an obligation. In these terms, according to the different OSI service layers, there are many high availability protocols, securing the according network services. The Spanning Tree family as STP, RSTP, MSTP, PVST, protocols for link aggregation as LACP and layer three routing redundancy services like VRRP.

These protocols have the advantage, being vendor independent standards and presume to be interoperable. But either design gets complex, interoperability keeps its caveats or ressources are simply disabled and take over in failiure. Thats not exactly performance driving.

So vendors created stacks – which failed otherwise, or they started to create systems of higher complexity which proprietary created load sharing high availability clusters in the Continue reading

HowTo activate SNMP on vSphere 6.0 hosts

Monitoring ESXi with an standard open source monitoring tool usually requires SNMP. Searching for SNMP in the vCenter configuration context this simply allows you to start the service – but not exactly leads to success in the first place. Probably you get an error.

You check in the security profiles and find the service stopped although it is configured to start with the host. Manual start delivers an “ooops”.

Looking for an clickable configuration context did not lead to an solution I was aware of. Continue reading

How-To: Init HPE FF5700 FlexFabric Switches

Left alone by some consultants, which charged a lot and did not accomplish to much, I ended up configuring FF5700 felx fabric switches myself. Some of the insights, other posts will follow.

To start with the basic initialization settings, configuring management access and doing initial firmware maintenance. After unpacking the switch and mounting fans and power supplies connect through the serial console – although there is dhcp client running on the switch which probably allows you to gain management access over the network. Remember there is a Gigabit- Ethernet- Port on the backside of the switch, dedicated for management access only. The console port is adjacent. Default serial settings are 9600/n/1/n as with any other HPE switch.

After the boot procedure press enter and you have access to the switch. Elevate your access level to configuration mode with:


To start with I actually disable the DHCP client and activate LLDP for further use.

undo dhcp enable
lldp global enable

After that prepare the desired VLANs according to whatever you later use. I strictly recommend leaving the default VLAN untouched, leaving the Primary VLAN ID on 1 and transport that untagged on any switch to switch link, but remove all access and server Continue reading

Raserurteil und unbeseelte Inteligenz. Ein Gedankenexperiment.

Diese Woche erging das Raserurteil in Berlin und dem Haupttäter – wie man ja nun schreiben darf, wurde – ich verkürze bewusst, weil es darum eigentlich hier nicht gehen soll – eine innige Beziehung zu seinem Fahrzeug nach gesagt und ebenso mangelnde Empathie zu seinen Mitmenschen. Das lass ich einfach mal so stehen, weil es eher eine Ausgangspunkt für einige spannende Transfers war, die am Ende viel mehr Fragen als Antworten lieferten.

Ich hab die Neuigkeit im Radio gehört. Auf meinem Weg zur Arbeit. Und denke noch so bei mir “Ich mag mein Auto eigentlich auch!”. Bin ich jetzt krank? Vermutlich nicht! Aber Continue reading

Published III – iX – Übertroffen

Mit großer Freude habe ich eben gesehen, dass die ersten iX 3/2017 Hefte auftauchen und im Report Teil mein Artikel “Übertroffen” über das konkrete Nexenta Virtualisierungsprojekt zu finden ist, das wir im letzten Jahr umgesetzt haben. Ganze 7 Seiten hat die Redaktion mir gegönnt.

[Update/Korrektur:] Die Information, dass die Community Edition über 18TB kostenfrei produktiv verwendet werden kann, ist so nach der aktuellen EULA nicht mehr korrekt. Das gilt nur noch für Verwendungszwecke die der Ausbildung dienen.