"It has been possible to use ZFS as the root file system since
Solaris 10 10/08 release in 2008. However, some Solaris users
missed the ability to be able to build and deploy "flash archive"
images -- which they could do with UFS and not ZFS What Oracle is
saying now is that the last barrier to using ZFS instead of UFS as
the root file system has gone away.
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