Undersized fix for small cluster, other than adding a 4th node?

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I added an erasure k=3,m=2 coded pool on a 3 node test cluster and am 
getting these errors. 

   pg 48.0 is stuck undersized for 23867.000000, current state 
active+undersized+degraded, last acting [9,13,2147483647,7,2147483647]
    pg 48.1 is stuck undersized for 27479.944212, current state 
active+undersized+degraded, last acting [12,1,2147483647,8,2147483647]
    pg 48.2 is stuck undersized for 27479.944514, current state 
active+undersized+degraded, last acting [12,1,2147483647,3,2147483647]
    pg 48.3 is stuck undersized for 27479.943845, current state 
active+undersized+degraded, last acting [11,0,2147483647,2147483647,5]
    pg 48.4 is stuck undersized for 27479.947473, current state 
active+undersized+degraded, last acting [8,4,2147483647,2147483647,5]
    pg 48.5 is stuck undersized for 27479.940289, current state 
active+undersized+degraded, last acting [6,5,11,2147483647,2147483647]
    pg 48.6 is stuck undersized for 27479.947125, current state 
active+undersized+degraded, last acting [5,8,2147483647,1,2147483647]
    pg 48.7 is stuck undersized for 23866.977708, current state 
active+undersized+degraded, last acting [13,11,2147483647,0,2147483647]

Mentioned here 
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-May/009572.html 
is that the problem was resolved by adding an extra node, I already 
changed the min_size to 3. Or should I change to k=2,m=2 but do I still 
then have good saving on storage then? How can you calculate saving 
storage of erasure pool?




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