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4.5. Gathering SNMP Statistics

The CSN includes an aggregate SNMP MIB called CARINGO-CASTOR-MGR-MIB with operational

and health status for all nodes in the associated DX Storage cluster, including:

• Cluster stats like total available capacity

• Cluster-wide settings like a cluster shutdown

• Individual node statistics including IP address and status

• Node-level actions like shutdown and retire

• Volume statistics including used and available capacity, operational activity and hardware status

information

The MIB is located in /usr/share/snmp/mibs. The SNMP agent collects statistics from the DX

Storage cluster at a default interval of 5 minutes. SNMP collection is only enabled on Primary CSNs.

The collection interval can be configured by overriding the default for the collectormain.sh line of

the /etc/cron.d/caringo_castormgr_snmp_collector file to any frequency greater than 2 minutes. If

queried, SNMP will report errors after the DX Storage nodes come online for the first time until data

is available when the first configured collection period has passed. DX Storage clusterState may

return as 'Unknown' or change frequently right after a cluster wide reboot or start until all nodes are

online and reporting their status.

The following example shows an snmpwalk command that will return all results for the CASTOR-

MGR-MIB:

snmpwalk -v 2c -c public -m +CARINGO-CASTOR-MGR-MIB 192.168.1.101

caringo.castorMgr

The following example demonstrates an snmpget command that retrieves the total GB of available

capacity for the cluster:

snmpget -v 2c -c public -m +CARINGO-CASTOR-MGR-MIB 192.168.1.101

caringo.castorMgr.stats.totalGBAvailable

The following example shows an snmpset command that sends a shutdown command to the 1st

node in the indexed list for the cluster:

snmpset -v 2c -c private -m +CARINGO-CASTOR-MGR-MIB 192.168.1.101

caringo.castorMgr.nodes.castorNodesActionTable.nodeActionEntry.

nodeShutdown.1 s shutdown

The following example shows an snmptable command that retrieves the data for all node-specific

actions:

snmptable -v2c -cpublic -OQs -m +CARINGO-CASTOR-MGR-MIB localhost

caringo.castorMgr.nodes.castorNodesActionTable

Version 2.0

December 2010