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Does a software raid on MacBook Air 11 w/Mac OSX Lion 10.7 impact performance?

Last Modified: 2013-11-24
I have a MacBook Air 11 1.8 Core i7 running Lion 10.7.2 connected to the Apple Thunderbolt Display which is in turn connected to a FW800 2 TB G-Drive which is connected to another 2 TB G-Drive via FW800. I have set the 2 drives up in a software RAID (block size 32) using Disk Utility. I have so far only created the iPhoto database on the RAID. I am experiencing the following issues:

1) When importing a large amount of photos the process often pauses for 5 seconds or so and then resumes.
2) Several times towards the end of an import the RAID disconnected from the system and the process stopped.
3) I often get the spinning beach ball, sometimes for quite a while when trying to start new processes, such as a copy or launching another app when the copying is happening.

Is this typical of Apple software RAID? Is there a problem in terms of the equipment I am using or how I have set it up? Is the MacBook Air not up to the task?

I have over 300gb of photos that I want to secure. I planned to use this RAID and then also use a Time Machine backup. But if this setup for the MacBook Air is not workable, I need a different solution, so please recommend.

Thanks in advance.
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