MAX AVAIL in ceph df

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Hi,

 

How is the MAX AVAIL calculated in ‘ceph df’? Since I am missing some space…

 

I have 26 OSD's, each is 1484GB (according to df). I have 3 replica's. Shouldn't the MAX AVAIL be: (26*1484)/3 = 12.861GB?

Instead ‘ceph df’ is showing 7545G for the pool that is using the 26 OSD’s.

 

What is wrong with my calculation?

 

Thanks!

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