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What the RLM does

The commands in the RLM CLI enable you to remotely access and administer the storage system and diagnose error conditions. Also, the RLM extends AutoSupport capabilities by sending alerts and notifications through an AutoSupport message.

Using the RLM CLI commands, you can perform the following tasks:

The RLM extends AutoSupport capabilities by sending alerts and "down system" or "down filer" notifications through an AutoSupport message when the storage system goes down, regardless of whether the storage system can send AutoSupport messages. Other than generating these messages on behalf of a system that is down, and attaching additional diagnostic information to AutoSupport messages, the RLM has no effect on the storage system’s AutoSupport functionality. The AutoSupport configuration settings and message content behavior of the RLM are inherited from Data ONTAP.

Note: The RLM does not rely on the option to send notifications. The RLM uses the Simple Mail Transport Protocol (SMTP).

In addition to AutoSupport messages, the RLM generates SNMP traps to configured trap hosts for all "down system" or "down filer" events, if SNMP is enabled for the RLM.

The RLM has a nonvolatile memory buffer that stores up to 4,000 system events in a system event log (SEL) to help you diagnose system issues. The event list from the SEL is automatically sent by the RLM to specified recipients in an AutoSupport message. The records contain the following data:

The RLM monitors the storage system console regardless of whether administrators are logged in or connected to the console. When storage system messages are sent to the console, the RLM stores them in the console log. The console log persists as long as the RLM has power from either of the storage system’s power supplies. Because the RLM operates with standby power, it remains available even when the storage system is power-cycled or turned off.

Hardware-assisted takeover is available on systems that support the RLM and have the RLM modules set up. For more information about hardware-assisted takeover, see the Data ONTAP High Availability and MetroCluster Configuration Guide for 7-Mode.

The RLM supports the SSH protocol for CLI access from UNIX clients and PuTTY for CLI access from PC clients. Telnet and RSH are not supported by the RLM, and system options to enable or disable them have no effect on the RLM.