扩展SCCM2012架构失败，ExtADSch.log的报错如下，
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<12-03-2014 11:18:20> Modifying Active Directory Schema - with SMS extensions.
<12-03-2014 11:18:21> DS Root:CN=Schema,CN=Configuration,DC=contoso,DC=com
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-Site-Code. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=mS-SMS-Assignment-Site-Code. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-Site-Boundaries. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-Roaming-Boundaries. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-Default-MP. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=mS-SMS-Device-Management-Point. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-MP-Name. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-MP-Address. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=mS-SMS-Health-State. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=mS-SMS-Source-Forest. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-Ranged-IP-Low. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=MS-SMS-Ranged-IP-High. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=mS-SMS-Version. Error code = 8224.
<12-03-2014 11:18:21> Failed to create attribute cn=mS-SMS-Capabilities. Error code = 8224.
<12-03-2014 11:18:21> Failed to create class cn=MS-SMS-Management-Point. Error code = 8202.
<12-03-2014 11:18:21> Failed to create class cn=MS-SMS-Server-Locator-Point. Error code = 8202.
<12-03-2014 11:18:21> Failed to create class cn=MS-SMS-Site. Error code = 8202.
<12-03-2014 11:18:21> Failed to create class cn=MS-SMS-Roaming-Boundary-Range. Error code = 8202.
<12-03-2014 11:18:21> Failed to extend the Active Directory schema, please find details in "C:\ExtADSch.log".
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然后我发现，我有两台DC，其中一台关机了，把那台DC开机，等待同步完成后。再次运行SCCM安装光盘中的SMSSETUP\BIN\I386\EXTADSCH.EXE就可以了，如下，
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<12-03-2014 16:53:26> Modifying Active Directory Schema - with SMS extensions.
<12-03-2014 16:53:26> DS Root:CN=Schema,CN=Configuration,DC=contoso,DC=com
<12-03-2014 16:53:34> Defined attribute cn=MS-SMS-Site-Code.
<12-03-2014 16:53:34> Defined attribute cn=mS-SMS-Assignment-Site-Code.
<12-03-2014 16:53:34> Defined attribute cn=MS-SMS-Site-Boundaries.
<12-03-2014 16:53:35> Defined attribute cn=MS-SMS-Roaming-Boundaries.
<12-03-2014 16:53:35> Defined attribute cn=MS-SMS-Default-MP.
<12-03-2014 16:53:35> Defined attribute cn=mS-SMS-Device-Management-Point.
<12-03-2014 16:53:35> Defined attribute cn=MS-SMS-MP-Name.
<12-03-2014 16:53:35> Defined attribute cn=MS-SMS-MP-Address.
<12-03-2014 16:53:35> Defined attribute cn=mS-SMS-Health-State.
<12-03-2014 16:53:35> Defined attribute cn=mS-SMS-Source-Forest.
<12-03-2014 16:53:35> Defined attribute cn=MS-SMS-Ranged-IP-Low.
<12-03-2014 16:53:35> Defined attribute cn=MS-SMS-Ranged-IP-High.
<12-03-2014 16:53:35> Defined attribute cn=mS-SMS-Version.
<12-03-2014 16:53:35> Defined attribute cn=mS-SMS-Capabilities.
<12-03-2014 16:53:43> Defined class cn=MS-SMS-Management-Point.
<12-03-2014 16:53:45> Defined class cn=MS-SMS-Server-Locator-Point.
<12-03-2014 16:53:45> Defined class cn=MS-SMS-Site.
<12-03-2014 16:53:46> Defined class cn=MS-SMS-Roaming-Boundary-Range.
<12-03-2014 16:53:46> Successfully extended the Active Directory schema.
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谢谢！