create storage failed: error during cfs-locked 'file-storage_cfg' operation: mkdir /mnt/pve/freenas_zfs_pool1/images: Permission denied at /usr/share/perl5/PVE/Storage/Plugin.pm line 1172. (500) OK

I tryied mount ZFS pool as NFS storage to Proxmox but got above error message.

Solution: Change directory rights on Truenas from 755 to 777.