The IT Experience Factor

The IT Experience Factor

The IT Experience Factor
How our experience touches our practices and the products that we use and maintain every day.
In the daily practice of working with IT many of our actions are governed by our past experiences, regardless of the capabilities of the technology today.  This article is designed to be a gathering place for many historical ‘rules of thumb’ that might no longer apply; rather an informal way to cause IT folks to think beyond these historic limits.
This was recently brought to head in a discussion with some peers.  In the progress of the discussion was an experiential split between ‘old’ and ‘young’ IT folks.  When I refer to ‘old’ or ‘young’ I am talking of years of experience, not years.  Nor is it a reflection of how intelligent a particular person might be.
The 'old ITguys' have been doing this stuff for a while, they have been burned - many times, they have learned 'rules' and they continue to apply those learned rules and experiences to new projects. They learned on equipment that was older, slower, and more prone to showing their limits.
The 'young IT guys' have not been doing this stuff for anywhere nearly as long, but they are just as smart as the old guys. They don't have the old rules in their heads, they have not been burned (yet, or anywhere near as much). They are learning on equipment that is new, fast, shiny which is less likely to show its limits.
 
Some examples:
How many VMs do you store on a single volume?
Past experience from various hypervisors and recommendations has set a reasonable number of 10.  However, there is very little information to support this common recommendation. 
In fact it is believed that this is a very old software limitation that has continued to persist as a rule of thumb.
Through discussion we believe that the limitation today is not the software, but rather revolves around how a person would like to manage the volume for backup, restore, or other management actions.
 
Please add additional examples.
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