2 –Glossary
SBB
StorageWorks building block. A device housed in a standard StorageWorks SBB carrier. An
SBB has a standard physical and electrical interface that is compatible with those of
StorageWorks shelves and enclosures.
SCSI
Small computer system interface. An ANSI interface defining the physical and electrical
parameters of a parallel I/O bus used to connect hosts to a maximum of seven devices. The
StorageWorks device interface is implemented according to the SCSI–2 standard, allowing the
synchronous transfer of 8-bit data at rates of up to 10 MB/s.
SCSI address
The decimal representation of the unique address assigned to a SCSI device, for example,
SCSI address 6.
SCSI id
The bit-significant representation of the unique address assigned to a SCSI device, for
example, SCSI id 011.
single-ended SCSI bus
A bus in which the voltage of a single wire in relation to ground determines each signal's logic
level.
small computer system interface
See SCSI.
split bus
Configuring a single SBB shelf SCSI bus as two individual buses (a four device bus and a
three device bus) creates a split bus.
spin-down
Removing power and halting data transfer starts the spin-down process. When the device is
no longer rotating and you can move the device, the spin-down is complete. In the case of
disk drives, the heads are retract and the media stops rotating.
spin-up
Applying power initiates the spin-up process. When the device is operational and ready for
data transfer operations spin-up is complete.
storage array subsystem
The controllers, storage devices, shelves, cables, and power supplies that form a mass storage
subsystem.
StorageWorks
Digital's family of modular data storage products that allows customers to design and
configure their own storage subsystems. Components include power supplies, packaging,
cabling, devices, controllers, and software. Customers can integrate devices and array
controllers in StorageWorks enclosures to form storage subsystems.
StorageWorks building block
See SBB.
target id
See SCSI id.
warm swap
Adding, removing, or replacing devices while the system remains operational is a controller
function. It is necessary to halt all activity on the device's SCSI bus for the duration of the
warm swap operation.
See also cold-swap and hot-swap.
Summary of Contents for BA346-K Series
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