How the tahoe-Lafs repair the file

[xiao_s_yuan]

I do some research on one computer , there are 10 storage nodes, after upload a file on the grid , the file distribute on the 10 nodes,then I run the rm -r 'u2' delete the share of the file , only left three shares,I think the system will do some work to increase the shares of the file to make it reliable,but after two days later,I run the linux command ' find /storage -name u2 ' and only find three shares,this means the grid do nothing after the file lost some shares,why will these happen ,can you help me ?
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