I want to warn people if you have any kind of write cache. And that includes Read/Write cache, or if you have Qtier, it is not safe to revert to QTS4.5 from QTS5.
If you have Read Only cache this problem should not affect you. But Read/Write cache means that some of your data is on the cache and not on the HDDs. If you revert to QTS4.5 from QTS5, you can lose that data and that can cause corruption.
So if you have read/write cache, write cache, or Qtier please do not revert to QTS4.5 from QuTS5.
If you must revert please get help from tech support for the reverting process. Tech support should be able to help you if you must revert.
Don't downgrade to QTS4.5 from QTS5 if you have cache or Qtier. You can lose your data if you do
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