Adding to multi-device raid filesystems

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Dear all,



What raid policy does a subsequent balance operation follow

when adding a new device to an existing -d raid0 filesystem

initially created on two devices? What if the initial creation

was raid1?



In particular, if I have two 1TB drives that I initially stripe,

can I subsequently mirror them onto a 2TB drive that I add

later on? Can I recover if any single drive fails?



Thank you.
 		 	   		  
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