A function to automatically fail back without any operator when the failed LAN recovered. See a standby patrol function (automatic fail-back if a failure occurs) or a standby patrol function (immediate automatic fail-back) for the detail.
Cluster failover function (failover function)
A function to fail over between clusters if all physical interfaces bundled by a virtual interface caused an error or if an active node panicked or hung when operating clusters.
A function to switch to a standby interface while an active interface is active.
Fast switching mode keeps the communication alive during transfer route failure and increases the total throughput by multiplexing transfer routes between servers on the same network.
A method that provides high-reliability by multiplexing transfer routes between GS (Global Server) and GLS, and switching to a normal route during transfer route failure.
A function to monitor from an active interface to a HUB connected to an active interface. It switches to a standby interface if detected an error.
[Related article] HUB-to-HUB monitoring function, Line monitoring
HUB-to-HUB monitoring function
A function to monitor an error in the connection between the HUBs (cascade connection). The monitoring range is from an active interface to a HUB connected to an active interface, and to the one connected to a standby interface. This function includes the monitoring range of a HUB monitoring function. However, it does not monitor a standby interface.
[Related article] HUB monitoring function
This structure employs the Linux kernel itself as a hypervisor, with total virtualization providing a virtualized OS environment.
The same meaning as that of HUB monitoring function.
[Related article] Inter-HUB monitoring function
Link status monitoring function
This function monitors the Ethernet link statuses of all duplicated LAN cards. When a link down occurred with a LAN card on the active side, a failover to a LAN card on the standby side is performed.
A load sharing configuration connects multiple GSs for distributing processing and thereby balancing load, intended to improve processing efficiency and reliability.
A logical interface created in a different name to the same one physical interface. For instance, a logical interface to a physical interface eth0 is eth0:X (X is 0, 1, 2...)
[Related article] Logical IP address
Logical IP address (logical IP)
An IP address assigned to a logical interface.
[Related article] Logical interface
Logical IP address takeover function
A function to take over a logical IP address from cluster to cluster. It is possible to take over a logical IP address if switching from an active node to a standby node occurred between clusters. A physical IP address is not taken over in this case.
Logical virtual interface is a logical interface created as distinguished name for a virtual interface. For example, a logical virtual interface for the virtual interface sha0 is represented as sha0:X (X refers to 2,3..64).
Note that if X becomes larger than 65, they are then used as a takeover virtual interface on a cluster environment.
A Monitoring frame is a unique frame GLS handles to monitor the transfer paths. Fast switching mode uses this feature to monitor associate host. For NIC switching mode, it uses this feature as standby patrol function to monitor standby interfaces.
[Related article] Standby patrol function, HUB monitoring function, Inter-HUB monitoring function
This function uses two methods (HUB monitoring and standby patrol) to monitor statuses of networks to which virtual interfaces are connected.
A function to create more than one piece of configuration information by sharing the NIC if the adding physical IP address is the same in all NICs and configuration information. Use this function to assign more than one IP to a pair of the redundant NICs. Use this to execute cluster mutual standby operation as well.
A mode to realize high reliability by exclusively using a redundant NIC and switching when an error occurred. It is necessary to connect a redundant NIC in the same network in this mode.
An interface created for the NIC equipped with in a system.
[Related article] Physical interface
Physical IP address (physical IP)
An IP address assigned to a physical interface.
[Related article] Physical interface
Physical IP address takeover function
Physical IP address takeover function is a function that takes over physical IP addresses between redundant NICs. On a cluster operation, it consists with two separate functions, they are Physical IP address takeover function I and IP address takeover function II.
Physical IP address takeover function I
This function takes over physical IP addresses between a cluster environment. Apply hanetconfig command with -e option before creating a virtual interface. It could takeover the physical IP address when switching occurs from operation node and standby node on cluster environment. Moreover, it activates physical interface on standby node of the cluster.
Physical IP address takeover function II
This function takes over physical IP addresses between a cluster environment. Apply hanetconfig command without -e option before creating a virtual interface. It could takeover the physical IP address when switching occurs from operation node and standby node on cluster environment. Moreover, it does not activate physical interface on standby node of the cluster.
An interface to use for communication initially in NIC switching mode.
[Related article] Secondary interface
Redundant Line Control function
A function to realize high reliability of communication by making a network line redundant.
A software package composed of various configuration and administration tools used to create and manage applications in an RMS configuration. For details, see "PRIMECLUSTER Installation and Administration Guide".
An interface initially standing by in NIC switching mode. It switches from a standby interface to an active interface if an error occurred in a primary interface.
Sharing transfer route monitoring
This refers to the case where multiple virtual interfaces specifies the same polling target. All of the virtual interfaces specified with the same polling target will simultaneously switch over when a failure occurs on the transfer route.
[Related article] NIC switching mode
An interface currently not used for communication, but to be used after switched.
[Related article] Active interface
A function to monitor the status of a standby interface in NIC switching mode. Monitoring a standby interface regularly detects a failure of NIC switching in advance. Standby patrol is to send a monitoring frame from a standby interface to an active interface and monitor its response. The monitoring range is from a standby interface to a HUB connected to a standby interface, a HUB connected to an active interface, and an active interface. This includes the monitoring range of an inter-HUB monitoring function. Therefore, it is not necessary to use an inter-HUB monitoring function when using a standby patrol function. The monitoring range of inter-HUB monitoring is from an active interface to a HUB connected to an active interface and the one connected to a standby interface, without including a standby interface.
[Related article] Standby patrol function (automatic fail-back if a failure occurs), Standby patrol function (immediate automatic fail-back)
Standby patrol function (automatic fail-back if a failure occurs)
A standby patrol function to automatically incorporate the failed interface as a standby interface when it recovered. This function automatically incorporates the failed primary interface as a standby interface when it recovered. This makes it possible to fail back to a primary interface if an error occurred in a secondary interface.
[Related article] Standby patrol function, Standby patrol function (immediate automatic fail-back)
Standby patrol function (immediate automatic fail-back)
A standby patrol function to fail back immediately after the failed interface recovered. When the failed primary interface recovered, this function immediately fails it back as an active interface. A secondary interface is incorporated as a standby interface in this case.
[Related article] Standby patrol function, Standby patrol function (automatic fail-back if a failure occurs)
Tagged VLAN attaches an identifier called a "tag" to communication packets of each network allow to build multiple virtual networks on the same physical line.
Tagged VLAN interface is a interface generated from a VLAN module that supports Tagged VLAN functionality (IEEE 802.1Q).
Takeover virtual interface is an interface of GLS, which takes over an interface between the cluster nodes. Takeover virtual interface is configured with a logical virtual interface containing logical number of 65 or later.
User command execution function
This refers execution of a command manually operated by the user.
[Related article] NIC switching mode, GS linkage mode
One of elements constituting a virtual network. It consists of bridge modules on the host OS (Linux).
An interface created for a Redundant Line Control Function to deal with a redundant NIC as one virtual NIC. The virtual interface name is described as shaX (X is 0, 1, 2...)
[Related article] Virtual IP address
Virtual IP address (virtual IP)
An IP address assigned to a virtual interface.
[Related article] Virtual interface
Communication method generating virtual interfaces for making multiple physical NICs (LAN cards) connected on the same network logically look like a single one. This mode controls switching of transfer paths by exclusively using redundant NICs. Without any limitations on communication targets, this mode also enables to communicate with hosts on other networks via routers.
