To check physical memory in Solaris, use the prtconf command. This command will display a list of all physical memory devices installed on the system, along with their size, speed, and other attributes.
Checking physical memory is important for several reasons. First, it allows you to verify that the system has enough memory to meet its needs. Second, it can help you identify any potential memory problems that could lead to system instability. Third, it can provide you with information about the type and speed of memory installed on the system, which can be useful for troubleshooting performance issues.