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ZFS Pool Performance⚓︎

ZFS Takes a Performance Penalty During High Utilization⚓︎

ZFS Pools should be kept below 80% utilization for best I/O performance. Once a volume goes over 80% the file system writes slow down and performance will become an issue. If the volume is primarily read you may be able to take the volume up to 95% utilized, but writes will still be impacted.

Also note that this performance hit impacts resilvering. This means that if you attempt to add a larger disk to the pool to increase the size, you may impact the already degraded I/O on the volume further.