![]() ![]() The process of encoding data to reduce its size. The state indicates that the source LUN data is being synchronized to the target LUN. It is the core component of a storage system and generally consists of components, such as controllers, power supplies, and fans.Ī pair state. The control logic in a storage subsystem that performs command transformation and routing, aggregation (RAID, mirroring, striping, or other), high-level error recovery, and performance optimization for multiple storage devices.Īn enclosure that accommodates controllers and provides storage services. ![]() ![]() The control logic in a disk or tape that performs command decoding and execution, host data transfer, serialization and deserialization of data, error detection and correction, and overall management of device operations. Files with expired protection periods can be deleted but not changed by the file user or the system administrator. In compliance mode, files within their protection period cannot be changed or deleted by either the file user or by the system administrator. It is used to store the mission-critical data of the system.Ī protection mode of WORM. A hash of the supplied password with the challenge is sent for comparison so the cleartext password is never sent over the connection.Ī technology for ensuring data security and integrity in a storage system. Specially designed to lock into place on a parent board or motherboard, allowing for easy installation and removal of attached pieces without release of the screw.Ĭhallenge Handshake Authentication ProtocolĪ password-based authentication protocol that uses a challenge to verify that a user has access rights to a system. The ratio of the number of cache hits to the number of all I/Os during a read task, usually expressed as a percentage. It indicates errors on the built-in FRUs of a controller, such as errors on fans or memory modules. The browser is the service request party and the server is the service provider. The system is defined under IEEE standard 1149.1 and is also known as Joint Test Action Group (JTAG).Īrchitecture that defines the roles of the browser and server. A data pattern is passed through the chain and the observed returned data stream affected by the circuit conditions gives an indication of any faults present. One IC is often connected to the next IC. BER is typically expressed as a negative power of 10.īonding of multiple independent physical network ports into a logical port, which ensures the high availability of server network connections and improves network performance.Ī test methodology that uses shift registers in the output connections of integrated circuits (ICs). The bit error rate (BER) is measured by counting the number of bits in error at the output of a receiver and dividing by the total number of bits in the transmission. The probability that a transmitted bit will be erroneously received. It is also possible for signal state changes to correspond to more than one code bit, so the baud rate may be lower than the code bit rate.Īn incompatibility between a bit in a transmitted digital signal and the corresponding bit in the received digital signal. If each signal state change corresponds to a code bit, then the baud rate and the bit rate are the same. The maximum rate of signal state changes per second on a communications circuit. A deprecated synonym for data transfer capacity that is often incorrectly used to refer to throughput. The numerical difference between the upper and lower frequencies of a band of electromagnetic radiation. The act of creating a backup.Īn interval of time during which a set of data can be backed up without seriously affecting applications that use the data. To be useful for recovery, a backup must be made by copying the source data image when it is in a consistent state. It optimizes the ventilation channels and improves the heat dissipation capability of the system.Ī collection of data stored on (usually removable) non-volatile storage media for purposes of recovery in case the original copy of data is lost or becomes inaccessible also called a backup copy. In this way, performance is not reduced due to data mirroring. When the data at the primary site is updated, the data does not need to be updated synchronously at the mirroring site to finish the update. ![]() Application programs of data services run on the application server.Ī kind of remote replication. The module that transfers the external AC power supply into the power supply for internal use.Ī service processing node (a computer device) on the network. ![]()
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