The big thing missing from the OSS implementations that Oracle 11 has got is FDE.
It's possible with dmcrypt and LUKS, but you void most of the reasons for using ZFS. encryptFS is also a possibility, but it's both much less secure (an attacker can run ls) and also drops a few ZFS features like dedup.
Meanwhile, Solaris 11 has FDE that actually works, and there seems to be no serious FOSS effort either to reverse engineer their work, or to design something better.
In 2013, no software developer should be storing things without FDE unless they have unusual physical security measures. That makes FOSS ZFS a non-starter for most of the people who would use it.
It's possible with dmcrypt and LUKS, but you void most of the reasons for using ZFS. encryptFS is also a possibility, but it's both much less secure (an attacker can run ls) and also drops a few ZFS features like dedup.
Meanwhile, Solaris 11 has FDE that actually works, and there seems to be no serious FOSS effort either to reverse engineer their work, or to design something better.
In 2013, no software developer should be storing things without FDE unless they have unusual physical security measures. That makes FOSS ZFS a non-starter for most of the people who would use it.