Parallel Zone Patching patch
One of the key issues at Solaris 10 deployments with many zones was the speed of patching. With the patches 119254-66 for Solaris SPARC and 119255-66 for Solaris x86 you can patch zones in parallel and thus reduce the time needed for this task:
While the performance gain is dependent on a number of factors, including the number of non-global zones, the number of on-line CPUs, the speed of the system, the I/O configuration of the system, etc., a performance gain of ca. 300% can typically be expected for patching the non-global zones - e.g. On a T2000 with 5 sparse root non-global zones.
You can find more informations about this new feature in the blog of the patching team at blogs.sun.com.