Configuring an Immutable Global Zone
To configure an immutable global zone is similar to configuring an immutable non-global zone.
The MWAC security policy is set with the zonecfg command, as Setting the MWAC Security Policy describes. After committing the
zone configuration, the boot information is written and the boot archive is updated. The global zone
becomes immutable immediately. No reboot is necessary. 
               
The following information is specific to immutable global zones:
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                     If the global zone uses DHCP to set network interfaces, the flexible-configurationMWAC policy must be selected.
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                     The rpooldataset is restricted.You can add an unrestricted sub-dataset by using the zonecfg add datasetcommand. An immutable global zone can only run zones in unrestricted datasets. All the children of an unrestricted dataset are also unrestricted.