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The default segment size for Mylex RAID controllers is 8K. Caching Allows data to be stored in a pre-designated area of a disk or RAM. Caching speeds up the operation of RAID systems, disk drives, computers and servers, or other peripheral devices. CD-ROM Compact Disk-Read Only Memory, a removable read-only storage device, similar to an audio compact laser disk, holding up to 640MB of data. Channel Any path used for the transfer of data and control of information between storage devices and a storage controller or I/O adapter. Also refers to one Manual No. 775012 SCSI bus on a disk array controller. Each disk array controller provides at least one channel. Conservative Cache An operating mode in which system drives configured with the write-back caching policy are treated as though they were configured for write-through operation and the cache is flushed. Consistency Check A process that verifies the integrity of redundant data. A consistency check on a RAID 1 or RAID 0+1 configuration (mirroring) checks if the data on drives and their mirrored pair are exactly the same. For RAID Level 3 or RAID Level 5, a consistency check calculates the parity from the data written on the disk and compares it to the written parity. A consistency check from Mylex utilities such as Global Array ManagerTM (GAM) or RAID EzAssistTM give the user the ability to have a discrepancy reported and corrected. See also Parity Check. Data Transfer Rate The amount of data per unit of time moved through a channel or I/O Bus in the course of execution of an I/O load, usually expressed in MBps. DB-9 A type of connector used for serial interfaces. Device Driver A software program that controls a particular type of device attached to a computer, such as a RAID subsystem, printer, display, CD-ROM, disk drive, etc. DIMM Dual In-line Memory Module, a circuit board that has memory chips. Instead of installing two SIMMs for the 64-bit memory path on a Pentium processor, one DIMM can be installed. See also SIMM. Disk A non-volatile, randomly addressable, re-writable data storage device, including rotating magnetic and optical disks as well as solid-state disks or other electronic storage elements. DAC960PG and DAC960PJ Installation Guide Glossary Disk Array A collection of disks from one or more commonly accessible disk systems. Disk arrays, also known as RAID, allow disk drives to be used together to improve fault tolerance, performance, or both. Disk arrays are commonly used on servers and are becoming more popular on desktops and workstations. See also Array. Disk Drive A device for the electronic digital storage of information. Disk System A storage system capable of supporting only disks. Drive Groups, Drive Packs A group of individual disk drives (preferably identical) that are logically tied to each other and are addressed as a single unit. In some cases this may be called a drive “pack” when referring to just the physical devices. All the physical devices in a drive group should have the same size; otherwise, each of the disks in the group will effectively have the capacity of the smallest member. The total size of the drive group will be the size of the smallest disk in the group multiplied by the number of disks in the group. For example, if you have 4 disks of 400MB each and 1 disk of 200MB in a pack, the effective capacity available for use is only 1000MB (5x200), not 1800MB. Drivers A software routine that receives I/O requests from higher levels within the operating system and converts those requests to the protocol required by a specific hardware device. Dual Active A pair of components, such as storage controllers in a failure tolerant storage system, that share a task or set of tasks when both are functioning normally. When one component of the pair fails, the other takes the entire load. Dual active controllers (also called Active/Active controllers) are connected to the same set of devices and provide a combination of higher I/O performance and greater failure tolerance than a single controller. Manual No. 775012 ECC Error Correcting Code, a method of generating redundant information which can be used to detect and correct errors in stored or transmitted data. EDO Extended Data Output, a type of random access memory (RAM) chip designed to improve the time to read from memory on faster microprocessors such as the Intel® Pentium. EEPROM Electrically Erasable PROM, see EPROM. EISA Extended Industry Standard Architecture, a bus standard for PCs extending the ISA architecture to 32 bits and allowing more than one CPU to share the bus. Embedded Storage Controller An intelligent storage controller that mounts in a host computer’s housing and attaches directly to a host’s memory bus with no intervening I/O adapter or I/O bus. EPROM Erasable Programmable Read Only Memory, memory which can be erased and re-used. eXtremeRAID A family of Mylex RAID controllers which offer uncompromising fault tolerance, data availability, superior configura...
Este manual também é adequado para os modelos :Equipamento de rede - PCI to Ultra SCSI RAID Controllers DAC960PJ (1.34 mb)