Manualshelf

User`s guide

ManualsBrandsDigital Equipment Corporation ManualsHome building and DecorStorage Works
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port
The hardware and software used to connect a host controller to a communication
bus, such as CI, DSSI, or SCSI bus. This term also is used to describe the
connect between the controller and SCSI storage devices.
PTL
Port-Target-LUN device notation. Where P designates the port (1 through 6), T
designates the target ID of the device (0 through 6 in a nonfailover configuration,
or 0 through 5 if the controller is in a failover configuration), and L designates
the LUN of the device (0 through 7).
qualified device
A device that has been fully tested in an approved StorageWorks configuration,
(that is, shelf, cabinet, power supply, cabling, and so forth) and is in complete
compliance with country-specific standards (for example, FCC, TUV, and so forth)
and with all Digital standards.
quiesce
To make a bus inactive or dormant. The operator must quiesce SCSI bus
operations, for example, during a device warm swap.
RAID
Redundant array of independent disks. The multiple storage access methods
devised for performance (RAID 0, striping) and/or various cost levels of
availability (RAID 1 through RAID 5).
RAIDset
Three or more physical disks that are configured to present an array of disks as a
single virtual unit to the host.
read cache
The cache is used to accelerate read operations by retaining data which has been
previously read, written, or erased, based on a prediction that it will be reread.
replacement policy
The firmware controller method by which a spare disk is selected to replace a
disk that has failed in a RAIDset.
SBB
StorageWorks building block. A modular carrier plus the individual mechanical
and electromechanical interface required to mount it into a standard shelf. Any
device conforming to shelf mechanical and electrical standards is considered an
SBB.
SBB shelf
StorageWorks building block shelf. A StorageWorks shelf, such as the BA350–Sx,
designed to house plug-in SBB modules.
SCS
System Communication Services. A delivery protocol for packets of information
(commands or data) to or from the host.
Glossary–6