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Yes it does.
Any reference to the in-depth technical details? Any docs on how it is implemented would be useful.
The OpenSolaris source code is available. I dont know if IPS package system code is available?
Anyway, this rocks. Hard. Before every install, it gets snapshot. And each snapshot are shown in GRUB. I just choose which snapshot I want to boot into.
Also, Nexenta has this. It is Ubuntu, but with OpenSolaris kernel. You have ZFS, DTrace, etc with Ubuntu userland.