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How to Downgrade 19C Grid Infrastructure to 12.1.0.2

ENVIRONMENT DETAILS: 2 NODES – ambeth01 and ambeth02 Grid owner – oragrid 19C ORACLE_HOME(current) – > /u01/app/19.0.0.0/grid 12C ORACLE_HOME (old) -> /u01/app/12.1.0.2/grid/bin Check the current grid version:( check on both the nodes) [oragrid@ambeth01 ~]$ crsctl query crs activeversion Oracle Clusterware active version on the cluster is [19.0.0.0.0] [oragrid@ambeth01 ~]$ crsctl query crs softwareversion -all Oracle Clusterware version on node [ambeth01] is [19.0.0.0.0] Oracle Clusterware version on node [ambeth02] is [19.0.0.0.0] [oragrid@ambeth01 ~]$ 1. As the first step for downgrade, remove the MGMTDB. Move the MGMTDB database on node1, if its running on node2. [oragrid@ambeth01 ~]$ ps -ef|grep pmon oragrid    952 21344  0 19:38 pts/0    00:00:00 grep --color=auto pmon oragrid   8102     1  0 14:32 ?        00:00:02 asm_pmon_+ASM1 oragrid   8609     1  0 14:33 ?        00:00:02 apx_pmon_+APX1 oracle    9025     1  0 14:33 ?        00:00:03 ora_pmon_depuat1 [oragrid@ambeth01
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ASM disk resizing in supercluster

Steps : 1 # login the global DB domain as root user and verfiy the ASM disk size dcli -l root -g /root/cell_group "cellcli -e list griddisk attributes name,size where name like \'DATAC3.*\'" Steps 2: # login the global DB domain as a root user and verify the all griddisk status. dcli -l root -g /root/cell_group 'cellcli -e "list griddisk attributes name,asmmodestatus,asmdeactivationoutcome,status"' Steps 3: # check the physical disk size and free space. cellcli -e "list celldisk where name like 'CD.*' attributes name, size, freespace" # check particular asm diskgroup disk size. cellcli -e "list griddisk where name like 'DATAC3.*' attributes name, size" Steps 4: # resize the ASM LUN's node by node. Please check below attached output values. as root user. # ssh sscceladm01 # cellcli -e alter griddisk DATAC3_CD_00_sscceladm01,DATAC3_CD_01_sscceladm01,DATAC3_CD_02_sscceladm01,DATAC3_CD_03_sscceladm01,DATAC3_CD_04_s
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Bare Metal Restore Procedure for Compute Nodes on an Exadata Environment

Remove the Failed Database Server from the Cluster 1. Disable the listener that runs on the failed database server: [oragrid@surviving ~]$ srvctl disable listener -n dm01db01 [oragrid@surviving ~]$ srvctl stop listener -n dm01db01 PRCC-1017 : LISTENER was already stopped on dm01db01 PRCR-1005 : Resource ora.LISTENER.lsnr is already stopped [oragrid@surviving ~]$ 2. Delete the Inactive Instance using DBCA via ( Instance management ) and Oracle Home from the Oracle inventory: [oracle@surviving ~]$ dbca ( vncserver ) [oracle@surviving ~]$ cd $ORACLE_HOME/oui/bin [oracle@surviving bin]$ ./runInstaller -updateNodeList ORACLE_HOME=/u01/app/oracle/product/11.2.0.4/dbhome_1 "CLUSTER_NODES=dm01db02" Starting Oracle Universal Installer... Checking swap space: must be greater than 500 MB.   Actual 23984 MB    Passed The inventory pointer is located at /etc/oraInst.loc The inventory is located at /u01/app/oraInventory 'UpdateNodeList' was successful. [ora
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