Glossary
A
active/standby switchover |
A switchover of data and status of the active and standby boards in a two-node system. After the switchover, the original active board changes to the standby board, and the original standby board changes to the active board. The active/standby switchover enhances system availability and ensures normal system operating if a fault occurs. |
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B
Baseboard Management Controller (BMC) |
As the core of the Intelligent Platform Management Interface (IPMI) standards, the BMC is responsible for collecting, processing, and storing sensor signals, and monitoring the operating status of components of a server. The BMC also provides the hardware status and alarm information about the managed objects to the management module to implement central management. |
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board-level liquid cooling cabinet |
Only the CPUs and memory of the servers in the cabinet use liquid cooling, and other components (such as drives and NICs) still use air cooling for heat dissipation. |
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C
captive screw |
A threaded screw which is held captive to a panel. When being unscrewed from its main nut, it remains fixed to the panel. |
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chassis |
A chassis houses the subrack, slots, backplane, cooling devices, power supply devices, and management modules of a server. It houses the internal components, allows interconnection between these components, and protects the internal components from pollution or damaged due to external forces. |
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profile |
A file that stores board configuration made by users and records the complete configuration process in command text format. It allows users to check and view the configurations conveniently. |
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configuration restoration |
An operation that restores the configuration of a newly installed switch module by using the profile of the switch module stored in the management module. |
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critical alarm |
An alarm for a critical fault. A threshold for generating a critical alarm can be set. |
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E
Ethernet |
A baseband local area network (LAN) architecture developed by Xerox Corporation by partnering with Intel and DEC. Ethernet uses the Carrier Sense Multiple Access/Collision Detection (CSMA/CD) access method and allows data transfer over various cables at 10 Mbit/s. The Ethernet specification is the basis for the IEEE 802.3 standard. |
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F
Fiber Channel (FC) |
A high-speed transmission technology used for a storage network. Optical fiber channels can be used to support common networks such as ATM and IP. They are mainly used to transmit small computer system interface traffic from servers to disk arrays. Optical fiber channels support single-mode and multi-mode optical fiber connections and coaxial cable and twisted pair connections. FC can provide connection-oriented and connectionless services. |
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Fibre Channel over Ethernet (FCoE) |
The FCoE technology maps fiber channels to Ethernet so that SAN data can be transmitted over the Ethernet. It can provide an I/O integration solution based on the FC storage protocols and protects the existing FC-SAN investment of customers. |
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Fast Ethernet (FE) |
Extended and enhanced Ethernet standards against traditional sharing media, which transfers data at the rate of 100 Mbit/s and complies with IEEE 802.3u. |
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floating IP address |
IP address used by the two-node cluster to communicate with external systems. The active and standby nodes have an IP address each. For example, the active node uses IP address 1, and the standby node uses IP address 2. When communicating with an external client, another IP address (for example, IP address 3) is used. IP address 3 is bound to the network adapter of the active node (the host has two IP addresses IP 1 and IP 3). The external client communicates with the host whose IP address is IP 3. The standby node has only IP2 and does not provide services externally. When an active/standby switchover occurs, IP3 is released from the original active node and bound to the network adapter of the new active node (original standby node). That is why the IP address is called floating IP address. |
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Field Replaceable Unit (FRU) |
A module or component that can be replaced in its entirety as part of a field service repair operation. Examples of this type of FRUs include: power supply modules, fan modules, compute nodes, storage nodes, switch modules, pass through modules, and management modules. Not all FRUs support hot swap. |
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full liquid cooling cabinet |
The CPUs and memory of the servers in the cabinet use liquid cooling, and other components (such as drives and NICs) still use air cooling for heat dissipation. An air/liquid heat exchanger is added to the cabinet to implement liquid cooling for the entire cabinet. |
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H
hard disk monitoring |
The function of monitoring the status of hard disks. If a hard disk is damaged, an alarm is generated to ask you to back up the data on the hard disk. This helps to find and eliminate the hidden risk. |
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hot swap |
A feature wherein insertion or removal of a board, when the system is running, does not affect normal running of the system. |
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HyperTerminal |
A program that can be called to connect to other computers, or log in to a remote site, bulletin board system (BBS), online services, and hosts by using modem or NULL modem cables. |
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I
Inter-Integrated Circuit (I2C) |
Philips launched the inter-chip serial transmission bus. It implements half-duplex synchronous data transmission by using two lines. |
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InfiniBand (IB) |
The InfiniBand architecture is a conversion cable technology that supports multiple concurrent connections. In this technology, each link can reach the speed of 2.5 Gbps. In this architecture, the speed of a link is 500 MB/s, the speed of four links is 2 GB/s, and the speed of 12 links can reach 6 GB/s. |
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Intelligent Platform Management Interface (IPMI) |
An open-standard hardware management interface specification, which defines a specific method for communication between embedded management subsystems. |
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M
major alarm |
An alarm for a major fault. A threshold for generating a major alarm can be set. |
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mezzanine card |
A printed circuit board (PCB) that is directly installed on another card. For example, the Mezz card can be installed on the VME bus card, Compact PCI card, and PCI card for function expansion. By using an adapter, the Mezz card can be installed on a bus slot. The mezz card is designed for robust applications. It is smaller than the standard expansion card and needs to be fixed by bolts. Mezz card types include IndustryPack, PMC, PC*MIP, and PC/104+. |
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midplane |
A passive circuit board in the chassis, used for device interconnection and provides support for power distribution and management, and auxiliary signal connections. |
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midrange computer |
A high-performance 64-bit computer that uses eight to 32 CPUs and fall in between mainframe computers and microcomputers in performance and price. |
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minor alarm |
An alarm for a minor fault. A threshold for generating a minor alarm can be set. |
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Millions of Packets Per Second (MPPS) |
Indicates the packet forwarding rate, that is, the port throughput. It is an important performance indicator of routers, firewalls, and switches. |
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O
out-of-band |
A channel independent of services. |
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P
Panel |
The front-most element of a board, perpendicular to the PCB, which serves to mount connectors, indicators, controls and mezzanines, and also seals the front of the subrack for airflow and electromagnetic compatibility (EMC). |
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Peripheral Component Interconnect Express (PCIe) |
A new bus standard, which can replace PCI and AGP interface specifications. Through the point-to-point and bi-directional interconnection technology, PCI or AGP parallel data transmission is changed into serial data transmission. This standard significantly increases the data transmission speed between devices. |
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Preboot Execution Environment (PXE) |
It is a technology that enables computers to boot from the network. This technology is the successor of Remote Initial Program Load (RPL). The PXE works in client/server mode. The PXE client resides in the ROM of a network card. When the computer is booted, the BIOS invokes the PXE client to the memory. The PXE client obtains an IP address from the DHCP server and downloads the operating system from the remote server through TFTP. |
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S
Sensor Data Record (SDR) |
A platform management data record that provides the sensor type, location, event generation, and access information. |
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System Event Log (SEL) |
A nonvolatile storage area and associated interfaces for storing system platform events for fault diagnosis and system recovery. |
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sensor |
A device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. Typically, a sensor consists of a sensitive component that measures a property, a component that converts the property into a signal, and auxiliary electronic circuits. |
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short-term operating condition |
A period less than or equal to 48 consecutive hours, or a total of less than or equal to 15 consecutive days in a year. |
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slot |
A position that hosts one module and determines the position of a module. |
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Simple Network Management Protocol (SNMP) |
Simple Network Management Protocol. The popular industry standard and the network management protocol that is used mostly on Transmission Control Protocol (TCP)/IP networks. SNMP ensures management information transmission between any two nodes, implementing the functions such as monitoring network devices, managing configurations, and collecting statistics. |
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Shock Response Spectrum (SRS) |
It specifies the maximum acceleration response curve generated by the device incited by the prescribed shock. Shock response spectrum II indicates that the half-sine pulse duration is 6 ms. |
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Solid-State Drive (SSD) |
A hard disk made of a solid-state electronic storage chip array consists of a control unit and a storage unit (DRAM or flash chip). The storage unit is used to store data, and the control unit is used to read and write data. |
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static IP address |
A four-byte TCP/IP network address permanently assigned to an individual machine or account. |
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static load |
Represents the capability of the packed equipment (in a specified stacking method) to bear the pressure from the top. |
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T
Telecommunication Network Protocol (Telnet) |
The standard terminal emulation protocol of TCP/IP, which is used for remote terminal connection and to access local system resources. |
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U
U |
A unit defined in International Electrotechnical Commission (IEC) 60297-1 to measure the height of a cabinet, chassis, or subrack. 1 U = 44.45 mm |
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