Is it possible to move the MPIO-Win license onto a new system?
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Yes, there's no license limitation. You can get the master licenese key here.
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That is exactly right.
As far as I can remember, it has always been free.
Not sure why it even has a license key.
I would have hoped that NetApp updated the last version (or Hey NetApp , create a new 4.1P2 version) to bypass the need for the license.
The reason for license is so that NetApp has a way to track usage in ASUP's that are reported back to NetApp.
If not for that then it would be removed.