CEO's Blog

Tuesday, April 28 2009

How we solved WMI error "8002801D : Library not registered" on an Exchange 2003 Server

When we tried to monitor a test installation of Exchange Server 2003 in our labs using WMI we always received the following WMI error message:

8002801D : Library not registered.

Using the following procedure we were able to reenable WMI monitoring for the Exchange Server:

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Friday, April 17 2009

How To Get Rid of Huge "Default User\Local Settings\Temporary Internet Files\Content.IE5" Folders

Some PRTG users that use the new "HTTP Full Page Sensor" on the local probe (or on remote probes) have found huge amounts of disk space eaten up by the Internet Explorer cache folder of the "default user". The folder is (on Windows XP):

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Tuesday, April 14 2009

Comparing Amazon EC2 performance with other cloud/VPS hosting options... and real hardware

We wanted to roughly rate performance of a virtual server hosted by Amazon EC2 compared to other hosting offerings. So last week we ran several performance tests on Amazon EC2 instances as well as other cloud and vps hosting platforms plus some servers in our own labs.

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Wednesday, April 08 2009

Dutch Translation for PRTG Network Monitor Available

Thanks to avid PRTG customer Gerard Feijth from the Netherlands you can now run the PRTG user interface in Dutch. He has translated the complete user interface into Dutch!

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Tuesday, April 07 2009

Monitoring Cloud Performance with PRTG: Comparing Disk Speed for Instance Stores and EBS Volumes on Amazon EC2

Here is another insight on Amazon's EC2 services that we found during our recent cloud monitoring experiments: For a couple of days we ran our load test sensor for disk speed monitoring on instance stores (disk volumes which come with each instance) as well as on EBS volumes (Amazon's Elastic Block Store) for all available instance types.

The results for a period of 48 hours are shown in this graph from PRTG Network Monitor:

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Monday, April 06 2009

Monitoring Cloud Computing Performance with PRTG: CPU, Disk, Memory Speed Comparison of Amazon EC2 Instance Types

Last Friday I have posted our first results from recent monitoring experiments on Amazon EC2 instance types were we published a comparison of average performance of the Amazon EC2 instance types.

Now, three days later, I can amend our observations on how the CPU, disk and memory performance of our EC2 instances behave if you monitor them for a couple of days (in our case between April 1st and April 5th).

The following graphs (taken straight out of PRTG Network Monitor) show the results of our CPU, disk and memory tests for the five available instance types. Each dot shows the results of one test:

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Friday, April 03 2009

Testing Cloud Computing Performance with PRTG: Performance Comparison of Amazon EC2 Instance Types

In version 7.1 of PRTG Network Monitor we have added a set of custom sensors which can be used to test the available CPU, disk and memory resources by running short load tests. We have used these load tests to measure the performance differences between instance types of Amazon Elastic Compute Cloud (EC2).

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Friday, April 03 2009

The Browser War Revisited (Part 3): Which Browsers Do People Use Around the World?

In the last weeks I have looked at the currently available web browsers from a "performance-for-PRTG" perspective and found that Chrome and Firefox are our recommendations for PRTG. Today I ran across the StatCounter Global Stats website where web analytics service Statcounter publishes its stats about browser usage worldwide.

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