HP XP20000/XP24000 Manuale di riferimento - Pagina 6

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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.

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.

Overview of SNMP