this is old but interesting blog on sparse zone in opensolaris / solaris 11

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Hung-Sheng Tsao ( LaoTsao) Ph.D

On Sep 7, 2011, at 7:42, Paul Kraus <> wrote:

> On Tue, Sep 6, 2011 at 5:11 PM, Mike Gerdts <> wrote:
>>> 3)zfs dataset requirement
>> How does this negatively impact you or other users?  As of Solaris 11
>> Express, this requirement means that you have to run 'zfs create' once
>> to create a ZFS filesystem that will be the parent of an arbitrry number
>> of zones.
>> I personally would not advocate a configuration where each zone is not
>> on its own file system because a disk hog in one zone can deny service
>> to other zones.
>    Be very careful here. If you allocate all of your Zones from a
> single zpool and do NOT use quotas (and reservations) you can have one
> Zone run the others out of disk space. Does the automatic (under the
> covers) zfs create in Solaris 11 also automate setting reasonable
> quotas and reservations ?
>    I don't want folks who are less familiar with ZFS to make that mistake.
>>  While I was working for a Fortune 10 company and
>> introduced zones early in Solaris 10's life, I ensured that every zone
>> had its own file system on a SVM soft partition.  This approach worked
>> well for many years, but took a significant amount of effort to
>> automate.  The integration of ZFS and Zones simplifies this type of
>> architecture greatly.
>    We have used almost exclusively sparse root zones; for the space
> efficiency, the global patching model, and the security of a read only
> OS. I will be sorry to see the option of a sparse root zone go away.
> -- 
> {--------1---------2---------3---------4---------5---------6---------7---------}
> Paul Kraus
> -> Senior Systems Architect, Garnet River ( )
> -> Sound Designer: Frankenstein, A New Musical
> (
> -> Sound Coordinator, Schenectady Light Opera Company (
> )
> -> Technical Advisor, RPI Players
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