The cluvfy (Cluster Verification Utility) is a tool provided by Oracle to verify the state of various components in an Oracle RAC (Real Application Clusters) environment before and after installation, patching, or other system changes. Here are the key points about the cluvfy utility:
The cluvfy utility performs system checks to ensure the required configuration and preinstallation steps have been completed successfully, so that the Oracle update or patch operation can complete without issues.
Some of the key checks performed by cluvfy include verifying node reachability, node connectivity, shared storage accessibility, free space in the CRS home, CRS integrity, and more.
To use cluvfy, you need to run the commands as the "grid" user. If the Grid Infrastructure is not yet installed, you can run cluvfy from the software files directory (e.g. /u01/orasw/grid). Otherwise, run it from the $ORACLE_HOME.
The cluvfy utility is included with the Grid Infrastructure installation, but you can also download the latest standalone version from My Oracle Support.
The standalone version is backward compatible and can be used with older Oracle RAC versions. Running cluvfy before and after patching Grid Infrastructure is recommended to ensure the patch can be applied successfully and the cluster is in a healthy state after the patch.
In summary, the cluvfy utility is an essential tool for verifying the readiness and health of an Oracle RAC environment and should be used regularly during the installation, configuration, and maintenance of the cluster.
Using the Cluster Verification Utility(CVU)
The CVU can verify the primary cluster components during an operational phase or stage. A component can be basic, such as free disk space, or it can be complex, such as checking Oracle Clusterware integrity. For example, CVU can verify multiple Oracle Clusterware subcomponents across Oracle Clusterware layers. Additionally, CVU can check disk space, memory, processes, and other important cluster components. A stage could be, for example, database installation, for which CVU can verify whether your system meets the criteria for an Oracle RAC installation. Other stages include the initial hardware setup and the establishment of system requirements through the fully operational cluster setup.
When verifying stages, CVU uses entry and exit criteria. In other words, each stage has entry criteria that define a specific set of verification tasks to be performed before initiating that stage.
This check prevents you from beginning a stage, such as installing Oracle Clusterware, unless you meet the Oracle Clusterware stage's prerequisites.
The exit criteria for a stage define another set of verification tasks that you need to perform after the completion of the stage. Post-checks ensure that the activities for that stage have been completed.
Post-checks identify stage-specific problems before they propagate to subsequent stages.
The node list that you use with CVU commands should be a comma-delimited list of host names without a domain. The CVU ignores domains while processing node lists. If a CVU command entry has duplicate node entries after removing domain information, then CVU eliminates the duplicate node entries. Wherever supported, you can use the -n all option to verify all of your cluster nodes that are part of a specific Oracle RAC installation. You do not have to be the root user to use the CVU and the CVU assumes that the current user is the Oracle user.
Cluster Verification Utility Requirements
The CVU requirements are:
- At least 30MB of free space for the CVU software on the node from which you run the CVU
- A location for the current JDK, Java 1.4.1 or later
- A working directory with at least 25MB of free space on each node
Verify the Post-installation Configuration of a Cluster
[oracle@collabn1 ~]$ cluvfy stage -post crsinst -n collabn1,collabn2
Performing post-checks for cluster services setup
Checking node reachability...
Node reachability check passed from node "collabn1"
Checking user equivalence...
User equivalence check passed for user "oracle"
Checking node connectivity...
Checking hosts config file...
Verification of the hosts config file successful
Check: Node connectivity using interfaces on subnet "192.168.78.0"
Node connectivity passed for subnet "192.168.78.0" with node(s) collabn2,collabn1
TCP connectivity check passed for subnet "192.168.78.0"
Check: Node connectivity using interfaces on subnet "172.16.100.0"
Node connectivity passed for subnet "172.16.100.0" with node(s) collabn1,collabn2
TCP connectivity check passed for subnet "172.16.100.0"
Checking subnet mask consistency...
Subnet mask consistency check passed for subnet "192.168.78.0".
Subnet mask consistency check passed for subnet "172.16.100.0".
Subnet mask consistency check passed.
Node connectivity check passed
Checking multicast communication...
Checking subnet "172.16.100.0" for multicast communication with multicast group "224.0.0.251"...
Check of subnet "172.16.100.0" for multicast communication with multicast group "224.0.0.251" passed.
Check of multicast communication passed.
Checking whether the ASM filter driver is active and consistent on all nodes
ASM filter driver library is not installed on any of the cluster nodes.
ASM filter driver configuration was found consistent across all the cluster nodes.
Time zone consistency check passed
Checking Cluster manager integrity...
Checking CSS daemon...
Oracle Cluster Synchronization Services appear to be online.
Cluster manager integrity check passed
UDev attributes check for OCR locations started...
UDev attributes check passed for OCR locations
UDev attributes check for Voting Disk locations started...
UDev attributes check passed for Voting Disk locations
Default user file creation mask check passed
Checking cluster integrity...
Cluster integrity check passed
Checking OCR integrity...
Checking the absence of a non-clustered configuration...
All nodes free of non-clustered, local-only configurations
Checking daemon liveness...
Liveness check passed for "CRS daemon"
Checking OCR config file "/etc/oracle/ocr.loc"...
OCR config file "/etc/oracle/ocr.loc" check successful
Disk group for ocr location "+OCRVOTE/collabn-cluster/OCRFILE/registry.255.934671619" is available on all the nodes
Checking OCR backup location "/u01/app/12.1.0/grid/cdata/collabn-cluster"
OCR backup location "/u01/app/12.1.0/grid/cdata/collabn-cluster" check passed
NOTE:
This check does not verify the integrity of the OCR contents. Execute 'ocrcheck' as a privileged user to verify the contents of OCR.
OCR integrity check passed
Checking CRS integrity...
Clusterware version consistency passed.
CRS 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
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 "collabn-cluster-scan.racattack"...
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 OLR integrity...
Check of existence of OLR configuration file "/etc/oracle/olr.loc" passed
Check of attributes of OLR configuration file "/etc/oracle/olr.loc" passed
WARNING:
This check does not verify the integrity of the OLR contents. Execute 'ocrcheck -local' as a privileged user to verify the contents of OLR.
OLR integrity check passed
Checking Oracle Cluster Voting Disk configuration...
Oracle Cluster Voting Disk configuration check passed
User "oracle" is not part of "root" group. 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 VIP configuration.
Checking VIP Subnet configuration.
Check for VIP Subnet configuration passed.
Checking VIP reachability
Check for VIP reachability passed.
Reference: https://docs.oracle.com/en/database/oracle/oracle-database/19/cwadd/cluster-verification-utility-reference.html#GUID-0CBB99C2-6F24-46E5-8A9B-A1A0C581E86A
Please feel free to ask. thank you 🙂
Toufique Khan
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