Starting with the Solaris 10 10/09 release, zones parallel patching enhances the standard Solaris 10 patch utilities. This feature improves zones patching performance by patching non-global zones in parallel.
For releases prior to the Solaris 10 10/09 release, this feature is delivered in the following patch utilities patches:
SPARC: patch 119254-66 or later revision
x86: patch 119255-66 or later revision
The global zone is still patched before the non-global zones are patched.
For more information, see the following documentation: