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硬件需求：系统内存最少8g,swape空间至少8g，OCR磁盘组最少39g。需要额外执行操作su-oracleulimit-s10240--对当前会话生效，但对同一时间的其他会话不生效，除新会话之外ulimit-a校验(-s选项值)su-gridulimit-s10240ulimit-a校验(-s选项值)安装前grid的环境变量中不需要设置ORACEL_HOME，安装成功后，再次添加ORACLE_HOME变量。节点一：将grid压缩包解压到ORACLE_HOME中，节点二：无须解压grid的zip文件，保证ORACLE_HOME下没有文件或文件夹。与11gRAC安装不同的是，11gRAC中可以自己选择grid用户的ORACLE_HOME，而12cRAC安装时，强制指定ORACLE_HOME为软件解压位置，且无法修改。虚拟机vmware，除增加磁盘共享配置(disk.locking="FALSE")外，还需要添加disk.EnableUUID="TRUE"如果不加，会导致rac环境安装前的检查报错(VerificationWARNINGresultonnode:12c-rac01Details:-PRVG-0805:Signatureforstoragepath"/dev/oracleasm/disks/OCR"couldnotbedeterminedonnode"12c-rac01".-Cause:Anerroroccurredwhileattemptingtodeterminethestoragesignatureoftheindicatedpath.Accompanyingmessagesprovidefurtherdetails.-Action:Resolvetheissuesdescribedinanyaccompanyingmessagesandretry.-PRVG-2078:Executionofcommand"/usr/sbin/cvuqdisk-sign2"onnode"12c-rac01"fordisk"/dev/sdb1"showedtherewasnoUUIDinthedisklabel.-Cause:AnattempttoretrievetheuniversallyuniqueID(UUID)fortheindicateddiskonthenodeshownusingtheindicatedcommandinordertocheckforsharednessacrossnodesdeterminedthatthediskdidnothaveaUUID.Sharednesscouldnotbecheckedforthisdevice.-Action:Tochecksharednessfortheindicateddevice,assigneditaUUIDusingthecommandsspecifictotheplatformandretrythesharednesscheck.Alternatively,selectadifferentdevicewithaUUIDforsharedaccessandverifysharednessforthatdisk.-PRVG-2078:Executionofcommand"/usr/sbin/cvuqdisk-sign"onnode"12c-rac01"fordisk"/dev/sdb1"showedtherewasnoUUIDinthedisklabel.-Cause:AnattempttoretrievetheuniversallyuniqueID(UUID)fortheindicateddiskonthenodeshownusingtheindicatedcommandinordertocheckforsharednessacrossnodesdeterminedthatthediskdidnothaveaUUID.Sharednesscouldnotbecheckedforthisdevice.-Action:Tochecksharednessfortheindicateddevice,assigneditaUUIDusingthecommandsspecifictotheplatformandretrythesharednesscheck.Alternatively,selectadifferentdevicewithaUUIDforsharedaccessandverifysharednessforthatdisk.-PRVG-2078:Executionofcommand"/sbin/udevadminfo-n/dev/sdb1-qall"onnode"12c-rac01"fordisk"/dev/sdb1"showedtherewasnoUUIDinthedisklabel.-Cause:AnattempttoretrievetheuniversallyuniqueID(UUID)fortheindicateddiskonthenodeshownusingtheindicatedcommandinordertocheckforsharednessacrossnodesdeterminedthatthediskdidnothaveaUUID.Sharednesscouldnotbecheckedforthisdevice.-Action:Tochecksharednessfortheindicateddevice,assigneditaUUIDusingthecommandsspecifictotheplatformandretrythesharednesscheck.Alternatively,selectadifferentdevicewithaUUIDforsharedaccessandverifysharednessforthatdisk.-PRVG-0805:Signatureforstoragepath"/dev/oracleasm/disks/OCR"couldnotbedeterminedonnode"12c-rac01".-Cause:Anerroroccurredwhileattemptingtodeterminethestoragesignatureoftheindicatedpath.Accompanyingmessagesprovidefurtherdetails.-Action:Resolvetheissuesdescribedinanyaccompanyingmessagesandretry.-)报错大致意思为，检查磁盘时，运行如下命令</usr/sbin/cvuqdisk-sign2/dev/sdb1/usr/sbin/cvuqdisk-sign/dev/sdb1/sbin/udevadminfo-n/dev/sdb1-qall>都无法获取添加磁盘的uuid，导致的报错。

GI安装时，在添加OCR磁盘组时，图形界面无法识别到磁盘

选中change discovery path

修改其中的路径为/dev/oracleasm/disks/*

重新发现即可。

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