DreamOn Technical Blog

Month: July 2011

How expensive is it to run a server at home (electricity)?

Ever asked yourself the question how much it will cost to run a server @ home ?
Well I did, I wanted to now how much exactly it costs on electricity to run my server @ home.

First of all you need to know how much energy your server consumes. I have a HP DL380 with the buildin power management in the ilo so I can readout how much the server consumes. If you don’t have that, maybe you have your server hooked to a ups that can readout the power consumption. If you don’t have that, there are also devices available to measure power consumption for a device (energy meters).

I took a readout of all the 3 devices: the energy meter, the ilo power manager and my UPS.
Continue reading

iceScrum installation on SLES

Today I received a demand from our programmers to install a tool called iceScrum.
I thought it would be a good idea to blog how I set it up.

A little quote to point out what iceScrum just is.

IceScrum is an agile management tool created by french students. IceScrum is a WebApplication that runs under a Tomcat server using a MYSql Database with GPL License. The tool is focused on Scrum only and brings basic functionalities to manage Scrum teams but with an original user interface.

You can find more information on there website

Don’t ask me any details on what the program can do because I only installed it :-S

Time to get our hands dirty and start installing

Continue reading

Repair Bricked iOmega Storcenter ix4

iomega-storcenter-ix4A couple of days ago, a costumer called me to tell me his storage wasn’t reachable anymore. The status on the lcd screen was giving a loading bar and got stuck at some point. He has a iOmega Storcenter ix4, I told him to do the basic things:

  • reboot the device
  • disconnect all the cables and reconnect it, then try to boot the device

Nothing helped … customer in panic so there went my evening.
Went over there and retried the basic stuff myself (no joy).
After a while trying some different angles nothing seemed to work, so i took it home with me.

After a sleepless night surfing, searching, trying stuff out ….
I found the solution, with no data loss non the less. Continue reading

NetApp – Data ONTAP Simulator 7

Since last year I’m doing some more work on our NetApp infrastructure.
Since I don’t have any training in storage management and certainly not in NetApp devices, I was always afraid to do something because I couldn’t test it. I have some basic knowledge  and some experience in home storage solutions like Freenas and Openfiler that helped me allot to get the basics in Netapp.

Surfing the NetApp site I found out that they have a simulator … mmmm intresting

Do you want to build or test a solution but don’t have access to NetApp storage? The Data ONTAP simulator, a tool that gives you the experience of administering and using a NetApp storage system with all the features of Data ONTAP at your disposal, is the answer. Download the simulator; discuss usage; and share your experience, technical articles, and best practices here.

This seems perfect for me to get some more experience in the NetApp environment and trying out solutions before I implement them.

So I went on and tried it out. Here is how to set it up:

First of all download the ISO from the Netapp website

(I downloaded version 7.3.5 because that is the current version in production)

The link to the simulator download page (login required):

Since I have a vmware test environement I will install the simulator on a virtual machine. Continue reading

vCenter disconnect Idle connections

In the previous post I introduced you guys to basic PowerCli

Well Today I’ve got a practical example script.
Over the last few weeks we had a lot of open sessions on our vCenter server.
This from people leaving there client open and never closing them (retards, sorry for the language).
This generated some idle sessions from a few hours to a few days :-S

This got so on my nerves that I wanted a solution for this, unfortunately vmWare did not implement the feature to disconnect idle session after a specific time in the Client or vCenter settings.

So time to build a script Continue reading

Powercli small introduction

Ever needed to do some bulk operation in you’re vmware virtual environment ?
Or just needed information of a bunch of virtual machines ?

Then you probably had a lot of manual labor to do in the vShere client.
Well vmware came with  a solution:

The program is called VMware vSphere PowerCLI and more information can be found here.

A short discription in the words of vmWare:

VMware vSphere PowerCLI provides a Windows PowerShell interface to the vSphere API. vSphere PowerCLI includes PowerShell Cmdlets (pronounced, “command-lets”) for administering vSphere components. In addition, the vSphere PowerCLI package includes the vSphere SDK for .NET for developers who want to create their own applications.

Let’s get started implementing and using the PowerCli

Continue reading

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