I'm currently running oVirt 4.1 (with gluster 3.8.15) and as this is a cluster 
which has been upgraded from (I believe) oVirt 3.5 originally, the storage 
volumes use old "Optimize for Virt Store" configuration of not enabling 
sharding. I see now that the oVirt 4.1 "optimize" configuration does enable 
sharding, but I am a bit wary after seeing some horror stories from about a 
year ago about corruptions and data loss caused by sharding in earlier gluster 
versions. Is the gluster associated with oVirt 4.1 now at a stable point that I 
can and should trust sharding?

I plan on doing some simple experimenting first, but I see a great benefit to 
balancing distributed-replicated volumes and for healing times and I would like 
to take advantage of these benefits now. Since the ovirt engine is now 
'recommending' the use of sharding for disk store volumes, this leads me to 
believe that it is trusted by the oVirt crew. Does this seem accurate?
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