1. If you removed /var/sadm/pkg/*, you’ll not be able to maintenance the normal patch process. Maybe you get an error:
Target boot environment not identified as solaris 10
The reason is missing of SUNWcsr and SUNWcsu
Solution: if you have the same OS with the same patch level, duplicate the /var/sadm/pkg/* to this server. Then install the recommended patch
2. Don’t put the unzipped patch cluster in a directory that the “nobody” cannot read. Otherwise you’ll not be able to install any patch.
3. If you want to save disk space of /var, you can remove /var/sadm/pkg/*/save. You’ll not be able to revert to previous patch version but doesn’t impact next patch