Determines the minimum size of the ZFS Adaptive Replacement Cache (ARC). See also zfs_arc_max.
Unsigned Integer (64-bit)
64 MB to zfs_arc_max
Yes, the range is validated.
When a system's workload demand for memory fluctuates, the ZFS ARC caches data at a period of weak demand and then shrinks at a period of strong demand. However, ZFS does not shrink below the value of zfs_arc_min. Generally, you do not need to change the default value.