snmpd

July 7th, 2009

The filer supports an SNMP version 1 (RFC 1157) compatible agent that provides support for both the MIB-II (RFC 1213) management information base for TCP/IP based internets as well as a Data ONTAP Custom MIB.

A number of user configurable options for the SNMP agent can be set and queried from the console using the snmp command (see snmp ).

Due to weak authentication in SNMP version 1, SetRequest commands that allow the remote setting of configuration variables have been disabled.

Access for snmp can be restricted by the options snmp.access command. Please see protocolaccess for details.

MIB-II

Under MIB-II, information is accessible for the system, interfaces, at, ip, icmp, tcp, udp and snmp MIBII groups. The transmission and egp groups are not supported.

The coldStart, linkDown, linkUp and authenticationFailure traps are implemented. Traps are configured using the snmp command.

DATA ONTAP CUSTOM MIB

The Data ONTAP Custom MIB provides a means to obtain detailed information about many aspects of filer operation via SNMP. The Custom MIB can be obtained from Network Appliance’s FTP site at ftp://ftp.netapp.com/pub/netapp/mib/netapp.mib, or by requesting the MIB on a floppy disk from Network Appliance Technical Support.

The following is a summary of the top-level groups in the Custom MIB and the information they contain:

product
Product-level information such as the software version string and system ID.

sysStat
System-level statistics such as CPU uptime, idle time and aggregate kilobytes received and transmitted on all network interfaces.

nfs
Statistics like those displayed by the nfsstat command (see nfsstat ), including statistics for each client if per-client NFS statistics have been enabled using the nfs.per_client_stats.enable option (see options ). The per-client NFS statistics are indexed by client IP addresses.

quota
Information related to disk quotas, including the output of the quota report command (see quota ). To access quota information, quotas must be turned on.

filesys
Information related to the file system, including the equivalent of the maxfiles and df commands, and some of the information from the snap list command (see df , maxfiles , snap ).

raid
Information on RAID equivalent to the output of the sysconfig -r command (see sysconfig ).

CLUSTER CONSIDERATIONS

In takeover mode, SNMP agents can continue to access the MIBs on both filers in a cluster. However, the counters reported by SNMP are combined counters from both filers. For example, in takeover mode, the SNMP agent can report the number of packets sent or received by both filers, but you cannot determine from the number how many packets are sent or received on each filer.

You can have an application on the network management station set an alarm when a filer has been taken over. The SNMP variable to check is the netapp.netapp1.sysStat.cf.cfSettings variable. If this variable is set to thisNodeDead, the filer has been taken over.