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A stack of external SCSI devices displaying various SCSI connectors. Parallel SCSI (SCSI Parallel Interface SPI) allows for attachment of up to 8 devices (8-bit Narrow SCSI) or 16 devices (16-bit Wide SCSI) to the SCSI bus. The SCSI Host controller takes up one slot on the SCSI bus, which limits the number of devices allowed on the bus to 7 or ...
On a parallel SCSI bus, a device (e.g. host adapter, disk drive) is identified by a "SCSI ID", which is a number in the range 0–7 on a narrow bus and in the range 0–15 on a wide bus. On earlier models a physical jumper or switch controls the SCSI ID of the initiator (host adapter).
Diagrams of different Parallel SCSI symbols [1]. Parallel SCSI is not a single standard, but a suite of closely related standards. There are a dozen SCSI interface names, most with ambiguous wording (like Fast SCSI, Fast Wide SCSI, Ultra SCSI, and Ultra Wide SCSI); three SCSI standards, each of which has a collection of modular, optional features; several different connector types; and three ...
A VHDCI connector. A very-high-density cable interconnect (VHDCI) is a 68-pin connector that was introduced in the SPI-2 document of SCSI-3. [1] The VHDCI connector is a very small connector that allows placement of four wide SCSI connectors on the back of a single PCI card slot. Physically, it looks like a miniature Centronics type connector ...
The ASPI manager software provides an interface between ASPI modules (device drivers or applications with direct SCSI support), a SCSI host adapter, and SCSI devices connected to the host adapter. The ASPI manager is specific to the host adapter and operating system ; its primary role is to abstract the host adapter specifics and provide a ...
The relationship between SCSI devices is described by a client-server service-delivery model. The client is called a SCSI initiator and the server is called a SCSI target. A SCSI domain consists of at least one SCSI device, at least one SCSI target and at least one SCSI initiator interconnected by a service delivery subsystem.
In SAS, both SCSI port identifiers and SCSI device names take the form of a SAS address, which is a 64 bit value, normally in the NAA IEEE Registered format. People sometimes refer to a SCSI port identifier as the SAS address of a device, out of confusion. People sometimes call a SAS address a World Wide Name or WWN, because it is essentially ...
Commodore Amiga, and Apple Macintosh deployed SCSI drive through the mid-1990s, by which time most models had been transitioned to ATA (and later, SATA) family disks. Only in 2005 did the capacity of SCSI disks fall behind ATA disk technology, though the highest-performance disks are still available in SCSI, SAS and Fibre Channel only.