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List:       opensolaris-discuss
Subject:    Re: [osol-discuss] Merge other distros to OpenIndiana?
From:       seeger () cise ! ufl ! edu (Charles Seeger)
Date:       2010-09-17 4:14:45
Message-ID: 201009170414.AAA03561 () rain ! cise ! ufl ! edu
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+------ Ian Collins wrote (Fri, 17-Sep-2010, 14:28 +1200):
|     
| OpenSolaris doesn't have sparse zones, so there nothing to support.
| 
| If I remember the threads at the time, they were (rightly) considered 
| unnecessary now we use ZFS for zone roots.

I have yet to find those discussions or any recent roadmaps (cough),
but I have found this FAQ entry:

http://hub.opensolaris.org/bin/view/Community+Group+zones/faq#HQWhycantIusesparserootzones

Q: Why can't I use sparse root zones?

A: The sparse root type of zone describes a fundamental interaction
   between zones and the package management system, and IPS doesn't
   support this concept.  BUT, we're working on providing the positive
   attributes of sparse root zones in different ways:

     * reduced memory footprint
     * reduced disk footprint
     * centralized control of zone's software
     * security due to read-only mounts
     * faster install/upgrade times
     * fewer bits to migrate across systems

  [Added June 2009]


I presume that some of these will depend on ZFS features.

Regards,
Chuck

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