Glossary
Manual No. 775029
G-25
enclosures, making it easier for a LAN administrator to obtain base-level
fault-tolerant alert notification and status information. All Mylex RAID
controllers feature SAF-TE.
SCA – Single Connector Attachment
A 80 pin disk drive/enclosure backplane connector standard designed to
support device hot swap. SCA drives connect to a SCSI backplane that also
provides power and SCSI ID selection. There are no TERMPWR lines
included ; it is assumed that termination circuit are on the backplane.
SCSI
SCSI is an acronym for “Small Computer Storage Interface,” although it is
often used in high performance systems. The SCSI interface supports disk
drives, tape drives, and CD-ROM drives. Narrow SCSI supports up to 7
devices on a channel, and Fast-Wide SCSI, Ultra-Wide SCSI, and Ultra2-
Wide SCSI support up to 15 devices on a channel.
SCSI Adapters
Storage controllers for managing SCSI devices
SCSI Drive
A disk drive equipped with a SCSI interface (sometimes referred to as a
SCSI Disk). Each disk drive will be assigned a SCSI address (or SCSI ID),
which is a number from 0 to 7 (0 to 15 under wide or Ultra SCSI). The SCSI
address uniquely identifies the drive on the SCSI bus or channel.
SCSI Drive States
Refers to a SCSI drive’s current operational status. At any given time, a SCSI
drive can be in one of five states: READY, ONLINE, STANDBY, DEAD, or
REBUILD.
The controller stores the state of the attached SCSI drives in its non-volatile
memory. This information is retained even after power-off. Hence, if a SCSI
disk is labeled DEAD in one session, it will stay in the DEAD state until a
change is made either by using a system level utility or after a rebuild. Each
of the states is described below:
