I have tested /usr/platform/`uname -m`/sbin/prtdiag -v command with two solaris mahcine. Here below i give the output 

Machine 1 :
uname -a
SunOS nms-t1000 5.10 Generic_127127-11 sun4v sparc SUNW,SPARC-Enterprise-T1000

/usr/platform/`uname -m`/sbin/prtdiag -v

System Configuration: Sun Microsystems sun4v SPARC Enterprise T1000
System clock frequency: 200 MHz 
Memory size: 8184 Megabytes 
================================ Virtual CPUs ================================
CPU ID Frequency Implementation Status
------ --------- ---------------------- -------
0 1000 MHz SUNW,UltraSPARC-T1 on-line 
1 1000 MHz SUNW,UltraSPARC-T1 on-line 
2 1000 MHz SUNW,UltraSPARC-T1 on-line 
3 1000 MHz SUNW,UltraSPARC-T1 on-line 
......

출처 : http://www.unix.com/solaris/144405-how-get-solaris-system-information.html



그러니까 결론... prtdiag -v 를 하면 됨!

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