VMware - TrueNAS
https://www.truenas.com/docs/core/solutions/integrations/vmware19.10.2021 · VMware iSCSI initiators operating with unidirectional CHAP can be configured in two behavior modes. In “Required” mode, an iSCSI adapter will give precedence to non-CHAP connections, but if the iSCSI target requires it, the connection will use CHAP instead. Required mode is only supported by Software iSCSI and Dependent Hardware iSCSI adapters.