HP Multi-Site Traffic Director sa9200 - Manual (Page 201)

G L O S S A R Y HP Multi-Site Traffic Director Server Appliance SA9200 User Guide
195
Load Balancer HP SA7200, SA7220, SA8200, or SA8220
Load Balancing The distribution of processing and communications activity across a
computer network so that no single device is overwhelmed. Load
balancing is particularly important for networks on which it is
difficult to predict the volume of requests likely to be issued to a
server. Busy Web sites typically employ two or more Web servers in
load balancing roles.
MIB Management Information Base. A repository of characteristics and
parameters managed in a network device, such as a NIC, hub, switch,
or router.
NAT Network Address Translation. This function is usually performed by
firewalls to hide internal network addresses from the outside world.
This technique is often used when a large pool of users on a local
network are sharing a small pool IP addresses that are valid to the
outside world. Firewalls performing NAT are unable to determine the
proper translation for packets originating from outside that they have
no knowledge of an internal packet being sent to.
NIC Network Interface Card. The attachment that connects a device to a
network by executing the code needed by the connected device to
share a cable or some other media with other stations.
Port The service port associated with a service.
Primary and
Secondary SA9200s
The initial SA9200 configuration is performed on a primary SA9200,
and is then automatically transferred (copied) to any SA9200s
designated as secondaries. This process is called Global Sync.
Peer A secondary SA9200 that has been committed.
Service A service is an application protocol that is offered on a network. The
device where the service is running is identified by an IP address. A
port is used to identify the protocol at the designated IP address.
Services contain an IP address and a port. For example,
10.54.67.6:80 describes a service consisting of a server’s HTTP
application listening on port 80 .
Server Response Time This algorithm directs requests to the site with the fastest aggregate
(i.e., across all servers) response time for the requested VIP. The
SA9200 knows about all of the VIPs for a particular site and knows
which one is performing best at that moment.
SNMP Simple Network Management Protocol.