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The following two sections will provide some guidelines and configuration considerations on the SNMP monitoring feature in OneFS.
By default, the SNMP monitoring feature is enabled and can be configured from both the CLI (isi snmp settings modify) and the web UI (SNMP Monitoring under General Settings of Cluster Management). You can enable or disable SNMP monitoring, allow SNMP access by version, and configure other settings, some of which are optional. All SNMP access is read-only.
There is one major difference between the CLI and the web UI. In CLI, it allows you to send the passphrase for encryption through the parameter –set-snmp-v3-priv-password, meanwhile there is no such option in the web UI. The recommendation is to not modify this passphrase. In case you modified this and met with an error, open a service request with Dell Support.
For step-by-step configuration details for the SNMP monitoring feature, see the CLI Administration Guide.
After the configuration is completed, you can use snmpwalk to validate if the configuration is good or not. This tool can be run either on a remote host or on a PowerScale node itself.
Note: This tool is pre-installed on the PowerScale system.
For SNMPv2c, the following is an example of using local snmpwalk running on the PowerScale to validate the configuration.
f800eth-1# snmpwalk -v2c -c I\$ilonpublic -m all localhost ifsFilesystem
ISILON-MIB::ifsTotalBytes.0 = Counter64: 189940499251200
ISILON-MIB::ifsUsedBytes.0 = Counter64: 22635765792768
ISILON-MIB::ifsAvailableBytes.0 = Counter64: 160600454995968
ISILON-MIB::ifsFreeBytes.0 = Counter64: 167304733458432
ISILON-MIB::ifsFilesystem.5.0 = INTEGER: 0
ISILON-MIB::ifsFilesystem.6.0 = Gauge32: 86400000
For SNMPv3, use the following example to validate the configuration.
snmpwalk -m all -c I\$ilonpublic -v 3 -l authnopriv -u general -a md5 -A 'password' localhost ifsFilesystem
ISILON-MIB::ifsTotalBytes.0 = Counter64: 400611948904448
ISILON-MIB::ifsUsedBytes.0 = Counter64: 10623134490624
ISILON-MIB::ifsAvailableBytes.0 = Counter64: 381578066165760
ISILON-MIB::ifsFreeBytes.0 = Counter64: 389988814413824
ISILON-MIB::ifsFilesystem.5.0 = INTEGER: 0
ISILON-MIB::ifsFilesystem.6.0 = Gauge32: 86400000
For details on how to use snmpwalk, see the section snmpwalk.
If you plan to monitor cluster statistics, SNMPv3 is recommended. When SNMPv3 is used, OneFS requires the SNMP-specific security level of AuthNoPriv as the default value when querying the PowerScale cluster. At the same time, it is recommended to disable SNMPv1 and SNMPv2c access.
Note: OneFS does not support SNMPv1. Although an option for –snmp-v1-v2c-access exists in the OneFS CLI command. If you turn on that parameter, OneFS will only monitor through SNMPv2c.
To do this, use the following CLI command line:
isi snmp settings modify –snmp-v3-access=yes
isi snmp settings modify –snmp-v1-v2c-access=no
For security, it is recommended to disable the SNMP service if SNMP monitoring is not required. Disabling SNMP on the cluster does not affect the sending of SNMP TRAP alerts from the cluster to an SNMP management server.
To disable the SNMP monitoring feature in OneFS, use the following CLI command line:
isi services snmp disable