S10 zones vs IBM LPARs

- Platform Availability - Zones is SPARC, x86 and x64 - with
OpenSolaris, who knows what else, LPARs are extremely vendor specific

- Performance overhead - Zones offer 0 perf overhead for applications,
as there is no virtualization layer (ala hypervisor) that apps have to
punch through. The overall system overhead for Zones is minimal, due to
all the resource sharing. Contrast this architecturally against LPARs.

- Managebability - LPARs do nothing for manageability of the datacenter,
all they do is consolidate the hardware footprint. For a large %age of
apps, Zones resolve a large part of the management headache

- Obserability - this is *key*. If an app in a LPAR is not behaving,
there is no way for someone inside that OS instance to see whats going
on around itself. You cant call someone up who can check the entire
platform to try and diagnose the problem. With Zones, the global zone
admin has full visibility into all the local zones, and into the entire
hardware platform, no virtualization.