Which storage technology should I choose?

There are different storage technology in IT industry like Aix cluster, ZFS etc. Now IT industries were moving from Unix to Linux. So let's see which is the best storage technology we can choose to learn that will shape our career.

SANs and NAS administration is definitely an advanced area and to be really good at it, requires a lot of advanced knowledge. But realize that each vendor tends to do things very differently. While you have common technology components like LUNs and HBAs how each vendor manages and configures these are widely different. Even between versions a vendor can turn your world up side down. That said, SANs aren't changed that often - since they're expensive and can be used for a lot of different things during their life time. So it's not a bad thing to know - and if the company you work for has a lot of data to store, they'll most likely have a SAN or NAS which is key to maintain and understand.

But ... and there is a but ... it ties you to THAT installation. Depending on how you want to plan your career that may be good or bad. Just know that going into it. You can take training and certifications with EMC and NetApps too - so like with Linux you can learn how to do things right and efficient.

Lastly - things are changing. Well they always are in IT - but within storage a big movement towards commodity storage solutions using Open Source is happening. Gluster, Ceph, FreeNAS, GFS and a lot more are all solutions giving you the same type of reliable high end storage using commodity hardware and open source software. It means you can purchase your hardware where you buy your cheap commodity servers and create high performing storage solutions yourself. That doesn't mean companies are going to throw out their current expensive and closed storage solutions - nor that they'll all use the Open Source alternatives right now. But like Linux in the early 2000s - the change is happening. Slowly but surely. In 10 years you may be considered a IT dinosaur if you're using EMC Claiion for instance - sorta like if you're planning to purchase Windows to run a large web-site today.

It's not a black and white answer. Look around you - if you have a lot of companies that uses SANs/NAS in your area it's a GREAT skill to have right now. If not - consider it a lock-in and be careful going down that road unless you know what you're doing.