The database software upgrade is an out of place upgrade with role separation. Use orachk or cluvfy to check the pre upgrade status. Output from cluvfy is shown below.
cluvfy stage -pre dbinst -upgrade -src_dbhome /opt/app/oracle/product/12.1.0/dbhome_1 -dest_dbhome /opt/app/oracle/product/12.1.0/dbhome_2 -dest_version 12.1.0.2.0 Performing pre-checks for database installation Checking node reachability... Node reachability check passed from node "rhel12c1" Checking user equivalence... User equivalence check passed for user "oracle" Specify user name for database "rac12c1" [default "DBSNMP"] : system Specify password for user "system" in database "rac12c1" : Checking node connectivity... Checking hosts config file... Verification of the hosts config file successful Check: Node connectivity using interfaces on subnet "192.168.1.0" Node connectivity passed for subnet "192.168.1.0" with node(s) rhel12c2,rhel12c1 TCP connectivity check passed for subnet "192.168.1.0" Check: Node connectivity using interfaces on subnet "192.168.0.0" Node connectivity passed for subnet "192.168.0.0" with node(s) rhel12c2,rhel12c1 TCP connectivity check passed for subnet "192.168.0.0" Checking subnet mask consistency... Subnet mask consistency check passed for subnet "192.168.0.0". Subnet mask consistency check passed for subnet "192.168.1.0". Subnet mask consistency check passed. Node connectivity check passed Checking multicast communication... Checking subnet "192.168.1.0" for multicast communication with multicast group "224.0.0.251"... Check of subnet "192.168.1.0" for multicast communication with multicast group "224.0.0.251" passed. Check of multicast communication passed. Total memory check passed Available memory check passed Swap space check passed Free disk space check passed for "rhel12c2:/opt/app/oracle/product/12.1.0/dbhome_2,rhel12c2:/tmp" Free disk space check passed for "rhel12c1:/opt/app/oracle/product/12.1.0/dbhome_2,rhel12c1:/tmp" Check for multiple users with UID value 500 passed User existence check passed for "oracle" Group existence check passed for "oinstall" Group existence check passed for "dba" Group existence check passed for "asmdba" Membership check for user "oracle" in group "oinstall" [as Primary] passed Membership check for user "oracle" in group "dba" passed Membership check for user "oracle" in group "asmdba" passed Run level check passed Hard limits check passed for "maximum open file descriptors" Soft limits check passed for "maximum open file descriptors" Hard limits check passed for "maximum user processes" Soft limits check passed for "maximum user processes" There are no oracle patches required for home "/opt/app/oracle/product/12.1.0/dbhome_1". There are no oracle patches required for home "/opt/app/oracle/product/12.1.0/dbhome_2". System architecture check passed Kernel version check passed Kernel parameter check passed for "semmsl" Kernel parameter check passed for "semmns" Kernel parameter check passed for "semopm" Kernel parameter check passed for "semmni" Kernel parameter check passed for "shmmax" Kernel parameter check passed for "shmmni" Kernel parameter check passed for "shmall" Kernel parameter check passed for "file-max" Kernel parameter check passed for "ip_local_port_range" Kernel parameter check passed for "rmem_default" Kernel parameter check passed for "rmem_max" Kernel parameter check passed for "wmem_default" Kernel parameter check passed for "wmem_max" Kernel parameter check passed for "aio-max-nr" Package existence check passed for "binutils" Package existence check passed for "compat-libcap1" Package existence check passed for "compat-libstdc++-33(x86_64)" Package existence check passed for "libgcc(x86_64)" Package existence check passed for "libstdc++(x86_64)" Package existence check passed for "libstdc++-devel(x86_64)" Package existence check passed for "sysstat" Package existence check passed for "gcc" Package existence check passed for "gcc-c++" Package existence check passed for "ksh" Package existence check passed for "make" Package existence check passed for "glibc(x86_64)" Package existence check passed for "glibc-devel(x86_64)" Package existence check passed for "libaio(x86_64)" Package existence check passed for "libaio-devel(x86_64)" Check for multiple users with UID value 0 passed Current group ID check passed Starting check for consistency of primary group of root user Check for consistency of root user's primary group passed Default user file creation mask check passed Checking CRS integrity... Clusterware version consistency passed. CRS integrity check passed Checking Cluster manager integrity... Checking CSS daemon... Oracle Cluster Synchronization Services appear to be online. Cluster manager integrity check passed Checking node application existence... Checking existence of VIP node application (required) VIP node application check passed Checking existence of NETWORK node application (required) NETWORK node application check passed Checking existence of ONS node application (optional) ONS node application check passed Oracle Clusterware is installed on all nodes. CTSS resource check passed Query of CTSS for time offset passed CTSS is in Active state. Proceeding with check of clock time offsets on all nodes... Check of clock time offsets passed Oracle Cluster Time Synchronization Services check passed Checking integrity of file "/etc/resolv.conf" across nodes "domain" and "search" entries do not coexist in any "/etc/resolv.conf" file All nodes have same "search" order defined in file "/etc/resolv.conf" PRVF-5636 : The DNS response time for an unreachable node exceeded "15000" ms on following nodes: rhel12c1,rhel12c2 checking DNS response from all servers in "/etc/resolv.conf" Check for integrity of file "/etc/resolv.conf" failed Time zone consistency check passed Checking Single Client Access Name (SCAN)... Checking TCP connectivity to SCAN listeners... TCP connectivity to SCAN listeners exists on all cluster nodes Checking name resolution setup for "rhel12c-scan.rac.domain.net"... Checking integrity of name service switch configuration file "/etc/nsswitch.conf" ... All nodes have same "hosts" entry defined in file "/etc/nsswitch.conf" Check for integrity of name service switch configuration file "/etc/nsswitch.conf" passed Checking SCAN IP addresses... Check of SCAN IP addresses passed Verification of SCAN VIP and listener setup passed Checking VIP configuration. Checking VIP Subnet configuration. Check for VIP Subnet configuration passed. Checking stale database schema statistics... Database stale schema statistics check is passed ASM and CRS versions are compatible Database Clusterware version compatibility passed. OS user consistency check for upgrade successful Group existence check passed for "asmadmin" Membership check for user "grid" in group "asmadmin" passed Group existence check passed for "asmoper" Membership check for user "grid" in group "asmoper" passed Group existence check passed for "asmdba" Membership check for user "grid" in group "asmdba" passed Pre-check for database installation was unsuccessful on all the nodes.The failure is due to PRVF-5636 which is ignored in this case.
Once the pre-req checks are validated run the installer from the 12.1.0.2 installation media. Give a new home for Oracle database software (part of out of place upgrade).
Refer earlier posts (non-CDB upgrade,CDB+PDB upgrade) for additional information with regard to pre-reqs for upgrades using DBUA.
After running DBUA from the new 12.1.0.2 oracle home select upgrade option.
At the end of the database upgrade the release version will also reflect the new version
crsctl query crs releaseversion Oracle High Availability Services release version on the local node is [12.1.0.2.0]Apply the patch 19518079 so that database upgrade status is reflected on registry$history.
This conclude the upgrade of RAC database from 12.1.0.1 to 12.1.0.2.
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Useful metalink notes
Master Note For Oracle Database 12c Release 1 (12.1) Database/Client Installation/Upgrade/Migration Standalone Environment (Non-RAC) [ID 1520299.1]
Complete Checklist for DBUA Upgrade from 12.1.0.1 to 12.1.0.N [ID 1933011.1]
How to Download and Run Oracle's Database Pre-Upgrade Utility [ID 884522.1]
How to execute sql scripts in Multitenant environment (catcon.pl) [ID 1932340.1]
Complete checklist for 12c R1 PDB upgrade (Upgrading single/multiple PDB) [ID 1933391.1]
Complete checklist for manual upgrade from 12.1.0.1 to 12.1.0.N (Full CDB Upgrade) [ID 1932762.1]
Oracle Database 12c Release 1 (12.1) DBUA : Understanding New Changes with All New 12.1 DBUA [ID 1493645.1]
Complete Checklist for Upgrading to Oracle Database 12c Release 1 using DBUA [ID 1516557.1]
Updating the RDBMS DST version in 12c Release 1 (12.1.0.1 and up) using DBMS_DST [ID 1509653.1]
dba_registry_history Table On Newly Created 11.2.0.2 Database Shows PSU Entry[ID 1367065.1]
"VIEW INVALIDATE" In Action Column Dba_Registry_History During Upgarde To 11.2.0.2 [ID 1390402.1]
