3x replicated rbd pool ssd data spread across 4 osd's

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If I have only one rbd ssd pool, 3 replicated, and 4 ssd osd's. Why are 
these objects so unevenly spread across the four osd's? Should they all 
not have 162G?


[@c01 ]# ceph osd status 2>&1
+----+------+-------+-------+--------+---------+--------+---------+-----
------+
| id | host |  used | avail | wr ops | wr data | rd ops | rd data |   
state   |
+----+------+-------+-------+--------+---------+--------+---------+-----
------+
| 19 | c01  |  133G |  313G |    0   |     0   |    0   |     0   | 
exists,up |
| 20 | c02  |  158G |  288G |    0   |     0   |    0   |     0   | 
exists,up |
| 21 | c03  |  208G |  238G |    0   |     0   |    0   |     0   | 
exists,up |
| 30 | c04  |  149G |  297G |    0   |     0   |    0   |     0   | 
exists,up |
+----+------+-------+-------+--------+---------+--------+---------+-----
------+

All objects in the rbd pool are 4MB not? Should be easy to spread them 
evenly, what am I missing here?



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