MTBF
Mean time between failures. The average time a component works without failure.
The larger the number, the longer the component will continue to operate.
MTTR
Mean time to repair. The average time it takes to repair a component.
NEBS
Network Equipment Building Standard. A stringent standard for durability,
grounding cables, and hardware interfaces specified by Telcordia Technologies
(formerly Bellcore) for equipment used in Telecom central offices.
RAID
Redundant Array of Independent Disks
Revenue services
Services for which an SP can collect payment from clients. Examples include: low−
end Web server, low−end hosting server, and application server.
SCSI
Small computer systems interface. Pronounced “scuzzy.” A hardware interface that
allows the connection of up to 15 peripheral devices to a single bus.
service provider (SP)
An organization that provides access to the Internet and offers a range of services
which include e−mail, Web site hosting, corporate firewalls, and virtual private
networks.
Sun Cluster
A Sun high availability software product that, when combined with redundant
hardware, provides failover protection and helps eliminate possible points of
failure.
Thin storage
Storage devices of two rack units (2 U) height or less.
Ultra SCSI single−ended
A SCSI interface that transfers 20 Mbytes/sec for 8−bit versions and 40 Mbytes/sec
for 16−bit versions. The maximum cable length is 9.8 feet (3 m) for up to four
devices and 4.9 feet (1.5 m) for five or more. Typically, up to 15 peripheral devices
can be connected to a single bus.
Ultra2 SCSI LVD
A SCSI interface that transfers 40 Mbytes/sec for 8−bit versions and 80 Mbytes/sec
for 16−bit versions. The maximum cable length is 39.4 feet (12 m). Backwards−
compatible with Ultra SCSI single−ended.
Ultra3 SCSI LVD
A SCSI interface that transfers 160 Mbytes/sec for 16−bit versions. The maximum
cable length is 39.4 feet (12 m). Backwards−compatible with Ultra SCSI single−
ended and Ultra2 SCSI.
Sun StorEdge S1 Array
26
Just the Facts 9/27/01
