#Volume is almost full at 700gb but has 1 qtree using 200 gb

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sly gull
#

I am encountering a problem where I wanted to increase a qtrees quota and it didnt have immediate effect. I checked the volume and saw it reached its capacity, so I added some more space to its hard limit.
A day later, i see the original capacity of the qtree where it was mounted has decreased and checked the volume again. I thought maybe theres another qtree there thats being used and taking space, but theres only one. I ran volume show-space in the netapp cluster and saw there was a snapshot spill of more than 450 gb. my questions are:
what is a snapshot spill?
how can this happen?
what can i do to fix it?