Hi, everyone!
        Nowadays, there are three issues confusing me recently when I  used the 
glusterfs to save huge datas. Like below:           1) Is there any reason for 
reserving 10% free space of each brick in the volume ? And Can I do not reserve 
the  10% free                    space of each brick in the volume?  You know, 
I will use the glusterfs to save huge surveillance videos,   so each brick will 
               be set a large disk space. If each brick will be reserved 10% 
free space, it must led to low usage of disk and waster many                  
disk spaces.           2) Will it appear some exceptions when the filesystem, 
like xfs, ext4, had been written fully?             3) Is it natural that a 
very high cpu usage when the directory quota is enabled ? (glusterfs 3.6.2)     
   And is there any solution to avoid it ?    I am very appreciate for your 
help, thanks very much.

    Best regards.

                                                                                
                                                                                
                                                                                
                                                            Louis               
                                                                                
                                                                                
                                                                                
                                          2015/6/25
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