Generally the same applies as with any other problem, you [ask a good question](http://meta.serverfault.com/a/3609/37681) that includes:

- What are you trying to do?
- What have you tried in order to make it happen?
- What results did you expect?
- What actually happened?

Where in step 2 you add something along the lines :

> I found `[link to this old Q&A]` that describes a similar problem  but that solution there is not applicable (anymore) because of `[reasons]`.

That generally prevents people from closing your question as a duplicate and shows that you're a professional that has done some research and/or tried a solution before asking the internet for help. 


Adding the link to the old Q&A in your own question has the added benefit that your question will (usually) also appear reciprocally  in the "Linked" column of that old Q&A , directing people that found the old Q&A to your newer question. A good title for your own new question helps in that regard. 

An example of this in practice is [this Q&A about the reliability of SSD drives](https://serverfault.com/questions/14189/reliability-of-ssd-drives) (from 2009) where the top Linked Q&A is [Are SSD drives as reliable as mechanical drives (2013)?](https://serverfault.com/q/507521/37681) 


[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/WLfUb.png