zfs-test 0.7.5-1ubuntu16.4 (s390x binary) in ubuntu bionic

 The Z file system is a pooled filesystem designed for maximum data
 integrity, supporting data snapshots, multiple copies, and data
 checksums.
 .
 This package provides the OpenZFS test infrastructure for destructively
 testing and validating a system using OpenZFS. It is entirely optional
 and should only be installed and used in test environments.