honestly, if you don't really know what you are doing you shouldn't try, especially with valuable data like databases but simply ask your host. You shouldn't be doing their work in the first place, let them set it up.
Not sure what you mean with virtual rack. If the servers have 4 solid state drives with consecutive serials you have another problem by the way, assuming the SSDs don't break down in between they will likely all wear out around the same time
What SSDs are you using?
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