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Raid 1 on existing Freenas file server

Posted on 2009-12-29
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I recently set up a freenas file server with a CF (to run freenas) and a 1TB drive. The server seems to be running great but now I would like to set up a raid 1 configuration (add one more 1TB drive) while not losing any of the data on the existing drive. Is it possible to just add one more TB drive to the box and then set up the RAID? To put my question another way: Do I have to format the existing drive in order to set up the RAID 1?
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Question by:flyinace2
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rindi earned 2000 total points
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Are you using hardware raid? If so you have to check the controller's manual, but usually it is just a matter of using the controller's setup utility to configure the array (no need to format the HD prior to this, just add it to array), this utility usually has an option with which you can say which is the master disk with the current data on it. But it is always important to check this out in the manual or get it confirmed via the manufacturer.

If you are going to use software RAID (with linux type OS's you should also use software raid if the raid controller uses soft- or fake-raid, like most motherboard integrated controllers do, as those controllers are often not properly supported in Linux, it's software raid is very efficient and usually performs better than the raid controller's integrated raid, and it allows you to move the array easily between different hardware). As I don't know freenas specifically, check it's documentation to setup software raid. But it probably uses dmraid, use google to find out how dmraid works and is setup.
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