How can I know which Solaris/hardware do I have - 32 or 64 bit? : Oracle FAQ

You can determine the currently running kernel with this command:

% isainfo -v
64-bit sparcv9 applications
32-bit sparc applications
%

As you can see, this machine is able to run 64 bit applications, thus it has a 64 bit kernel running. If you only saw a 32-bit response or even "Command not found" then you are running with a 32 bit kernel.

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