How to get the serial number of a SunFire V20Z Server

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If you need to get the serial number of an old SunFire v20Z server, use ipmi:

yourhost# ipmitool fru
FRU Device Description : Builtin FRU Device (ID 0)
Error receiving message: Input/output error
 Chassis Type                    : Rack Mount Chassis
 Chassis Part Number     : 602-2844-01
 Chassis Serial                  : XG123456789
 Board Mfg Date        : Mon Jan 24 00:00:00 2005
 Board Mfg             : S-SCI448
 Board Product         : NWSBIDff
 Board Serial          : M123M45E
 Board Part Number     : S02035
 Product Manufacturer  : Sun Microsystems
 Product Name          : Sun Fire(tm) V20z
 Product Part Number   : 602-2844-01
 Product Version       : A02
 Product Serial        : XG123456

FRU Device Description : cpu0.mem0.vpd (ID 1)
 Board Mfg Date        : Sat Jan 15 00:00:00 2005
 Board Mfg             : ce00000000000000
 Board Product         : 1GB DDR333 (PC2700) ECC
 Board Serial          : 02013815
 Board Part Number     : M3 12L2820EG0-CB3
 Product Manufacturer  : ce00000000000000
 Product Name          : 1GB DDR333 (PC2700) ECC
 Product Part Number   : M3 12L2820EG0-CB3
 Product Version       : 3045
 Product Serial        : 02123456

FRU Device Description : cpu0.mem1.vpd (ID 2)
 Board Mfg Date        : Sat Jan 15 00:00:00 2005
 Board Mfg             : ce00000000000000
 Board Product         : 1GB DDR333 (PC2700) ECC
 Board Serial          : 02053817
 Board Part Number     : M3 12L2820EG0-CB3
 Product Manufacturer  : ce00000000000000
 Product Name          : 1GB DDR333 (PC2700) ECC
 Product Part Number   : M3 12L2820EG0-CB3
 Product Version       : 3045
 Product Serial        : 02123456

[...]

This works at least on FreeBSD.

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