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Glossary
DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
337
Protocol A system of rules and procedures governing communications between
two or more devices. Protocols vary, but communicating devices must
follow the same protocol in order to exchange data. The format of the
data, readiness to receive or send, error detection and error correction
are some of the operations that may be defined in protocols.
Redundant Not essential.
router A router is a device that enables connectivity between SCSI devices and
FC networks. It routes each data command to the appropriate SCSI
channel based on the address it is intended for.
SAM (Storage
Array Man-
ager)
For the EF2800 family of RAID products, provides a browser-based
interface for configuring, managing, and monitoring the EF2800. In
both the user interface and the documentation, it is often referred to as
SAM.
SCSI adapter A SCSI adapter is a 16-bit fast/wide or 8-bit narrow, single-ended or
differential physical connection between a router and SCSI devices.
Each SCSI adapter supports up to 16 (fast/wide) or 8 (narrow) SCSI
devices, including itself.
SCSI address-
ing
Each device supported by a SCSI adapter has its own unique SCSI
address, which dictates the device’s priority when arbitrating for
access to the SCSI bus. A SCSI address of 7 has the highest priority. For
a fast/wide SCSI adapter that supports up to 16 devices, the next
highest priority address is 6, then 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9,
and 8. A narrow SCSI adapter supports up to eight devices, including
itself. The SCSI address 7 has the highest priority, followed by 6, 5, 4, 3,
2, 1, and 0.
SCSI bus A SCSI bus provides a means of transferring data between SCSI
devices. A SCSI bus is either an 8- or 16-bit bus that supports up to 8 or
16 devices, including itself. The bus can consist of any mix of initiators
and targets, with the requirement that at least one initiator and one
target must be present.
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