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External RAID Controllers
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External RAID controllers are external devices for higher-end design systems. In this case, the RAID controller is removed completely from the system to a separate box. Within the box the external RAID controller manages the drives in the array, typically using SCSI, and then presents the logical drives of the array over a standard interface (again, typically a variant of SCSI) to the server using the array. The server sees the array or arrays as just one or more very fast hard disks; the RAID is completely hidden from the machine. In essence, one of these units really is an entire computer unto itself, with a dedicated processor that manages the RAID array and acts as a conduit between the server and the array. Products & Services
RAID products include component within a RAID system, such as RAID controllers and RAID disk arrays. RAID is an acronym for redundant array of independent (or inexpensive) disks.
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RAID controllers are computer boards that control RAID systems.
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RAID disk arrays are collections of storage disks with integrated controllers to manage the storage of data.
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Fibre Channel products include hubs, directors, servers, adapters, etc.
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SCSI switches connect test points or devices to instruments for the testing, measuring, or monitoring industrial systems. Small computer system interface (SCSI) is an intelligent peripheral bus with a standard, device-independent protocol that allows many peripheral devices to be connected to the SCSI port.
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Topics of Interest
Bus-based RAID controllers are computer boards that are installed in a personal computer (PC) or server and connected to the array drives. They take the place of the SCSI host adapter or IDE/ATA...
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Overview
In 1993, the first edition of The RAIDbook was published by the RAID Advisory Board. This book formed part one of the RAID Advisory Board's objectives the standardization of terminology for...
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2.5 Hardware Tuning
The world would be much simpler if tuning the hardware could be done independently from tuning the software. Unfortunately, the two are intimately related. Although expert tuners...
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3.2 Redundant Array of Independent Disks
In the 1980's, when disk drives began to come down in price and improve in reliability, a group of three University of California at Berkeley professors...
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Overview
Clusters in Tru64 UNIX 5.x require shared operating system disks. These can be either SCSI or Fibre Channel. This document covers the Compaq Fibre Channel controller, StorageWorks HSG80. It...
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