The patch locations may vary, depending on the version of the operating system you are using. Let's first take a brief look at the two mechanisms that you may see.
Prior to Solaris 2.5, a mechanism known as “Progressive Instance Patching” was used to apply patches. For this, a new instance of a package was created whenever any patches were being applied that affected the package.
For example, if 101580-09 patched the package SUNWcsr, then after it had been applied we would find that there were two instances of the package. The first (and original) would be found in /var/sadm/pkg/SUNWcsr, while the second (patched) version would be found in /var/sadm/pkg/SUNWcsr.2.
The ancillary ...