Is the 41% - 0% your cache miss ratio?(IMAGE BELOW)
or is it 41% active and 0% replica.(IMAGE BELOW)
Your showing about 100GB used vs 62 GB of Data.
If you have a high mutation rate the 100GB vs 62GB could be b/c of memory fragmentation is memcached which is normal.
Also is 62GB active data only or Active + Replica Data ???