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OneFS SNMP monitoring feature only supports SNMPv2c and SNMPv3. Compared with SNMPv2c, SNMPv3 adds both authentication and encryption features. Table 8 lists the supportability for OneFS SNMP monitoring.
Protocol version | Configuration | Configuration description | Supportability | Note |
SNMPv2c | N/A | N/A | Supported | By default, SNMPv2c is enabled |
SNMPv3 | AuthPriv | Both authentication and encryption are enabled | Not supported | By default, SNMPv3 is disabled |
AuthNoPriv | Authentication is enabled but encryption is disabled | Supported (default, if you enable SNMPv3 and it is recommended) | ||
noAuthNoPriv | Both authentication and encryption are disabled | Supported |
The architecture of the SNMP monitoring feature is shown in Figure 19:
SNMP applications run in a network management system (NMS) and issue queries (SNMP GET/GET NEXT) to the SNMP service on PowerScale to gather information. snmpd – the SNMP daemon on the cluster responds to the queries and sends the corresponding statistics to the SNMP applications. An SNMP community is a logical relationship between the SNMP service on the OneFS side and the NMS on the client side. The community has a name, and the default name for PowerScale OneFS is I$ilonpublic.
Elements in an SNMP hierarchy are arranged in a tree structure, similar to a directory tree. As with directories, identifiers move from general to specific as the string progresses from left to right. Unlike a file hierarchy, each element is not only named, but also numbered.
For example, the SNMP entity .iso.org.dod.internet.private.enterprises.isilon.oneFSss.ssLocalNodeId maps to the object id (OID) .1.3.6.1.4.1.12124.3.2 as shown in Figure 20. The part of the name that refers to the OneFS SNMP namespace is the 12124.3 element. Anything further to the right of that number is related to OneFS specific monitoring.
Management Information Base (MIB) documents define human-readable names for managed objects and specify their data types and other properties. You can download MIBs that are created for SNMP monitoring of aa PowerScale cluster from the OneFS web administration interface or manage them using CLI. MIBs are stored in /usr/share/snmp/mibs/ on a OneFS node. The OneFS MIBs serve two purposes:
A PowerScale cluster has two separate MIBs: