HP XP20000/XP24000 HP StorageWorks XP24000/XP20000 SNMP Agent Reference Guide - Page 6

Management Information Base (MIB), SNMP Agent Overview, System Configuration

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• SNMP uses the TCP/IP UDP. If the SNMP agent does not respond within a specified time period, the SNMP manager re-sends the request packet. That time period is set by the system administrator, taking into account the network traffic and operation policy. • If an SNMP agent again does not respond to the re-sent packet, the SNMP manager assumes that an error has occurred. Depending on the times set for polling and response, this can take several seconds. If an SNMP agent detects an abnormal event, it sends a trap to the SNMP manager. However, if a trap is dropped in transmission, the SNMP manager does not know that it was sent. For this reason, you should use both polling and traps to determine whether an abnormal event has occurred. Management Information Base (MIB) Each managed device has certain types of information, including the configuration information, the status information for device, and statistical, which is known collectively as a Management Information Base (MIB). Each parameter is called a managed object, and it consists of the parameter name, one or more parameter(s), and a group of operations that can be executed with the object. The MIB defines the type of information that can be obtained from a managed device, and the device settings that can be controlled from a management system. SNMP Agent Overview System Configuration The SNMP agent for the HP storage system is on the SVP, which is the computer within the storage array that manages the storage system. The storage system has an exclusive LAN for communications between a disk controller and a service processor, and a separate LAN for SNMP. The configuration of each Network Management Station is determined by the type of SNMP Manager. The following figure illustrates the SNMP environment. Figure 2 SNMP Environment Architecture The following figure shows an example of SNMP operations by using an SNMP manager. 6 Overview of SNMP

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SNMP uses the TCP/IP UDP. If the SNMP agent does not respond within a specified time
period, the SNMP manager re-sends the request packet. That time period is set by the system
administrator, taking into account the network traffic and operation policy.
•
If an SNMP agent again does not respond to the re-sent packet, the SNMP manager assumes
that an error has occurred. Depending on the times set for polling and response, this can take
several seconds.
If an SNMP agent detects an abnormal event, it sends a trap to the SNMP manager. However, if
a trap is dropped in transmission, the SNMP manager does not know that it was sent. For this
reason, you should use both polling and traps to determine whether an abnormal event has
occurred.
Management Information Base (MIB)
Each managed device has certain types of information, including the configuration information,
the status information for device, and statistical, which is known collectively as a Management
Information Base (MIB). Each parameter is called a managed object, and it consists of the parameter
name, one or more parameter(s), and a group of operations that can be executed with the object.
The MIB defines the type of information that can be obtained from a managed device, and the
device settings that can be controlled from a management system.
SNMP Agent Overview
System Configuration
The SNMP agent for the HP storage system is on the SVP, which is the computer within the storage
array that manages the storage system. The storage system has an exclusive LAN for communications
between a disk controller and a service processor, and a separate LAN for SNMP. The configuration
of each Network Management Station is determined by the type of SNMP Manager. The following
figure illustrates the SNMP environment.
Figure 2 SNMP Environment Architecture
The following figure shows an example of SNMP operations by using an SNMP manager.
6
Overview of SNMP