Installation guide

G-10 AcceleRAID 150 Installation Guide
Striping
Refers to the storing of a sequential block of incoming data across multiple
SCSI drives in a group. For example, if there are 3 SCSI drives in a group,
the data will be separated into blocks and block 1 of the data will be stored
on SCSI drive 1, block 2 on SCSI drive 2, block 3 on SCSI drive 3, block 4
on SCSI drive 1, block 5 on SCSI drive 2 and so on. This storage method
increases the disk system throughput by ensuring a balanced load among all
drives.
System Drives
A system drive is equivalent to a “logical” drive. System drives are presented
to the operating system as available disk drives, each with a capacity
specified by the DAC960 Series controller.
Target ID
A target ID is the SCSI ID of a device attached to a DAC960 controller. Each
SCSI channel can have up to 15 attached SCSI devices (target ID from 0 to
6, and 8 to 15).
Ultra SCSI
Ultra SCSI, or Fast 20 SCSI is a high performance SCSI protocol that has a
bus speed of 20 MegaBytes per second in the Narrow SCSI configuration
and 40 MegaBytes in the Wide SCSI (Fast 20 Wide SCSI) configuration.
Ultra2 SCSI
Ultra2 SCSI, or Fast 40 SCSI is a higher performance SCSI protocol than
Ultra SCSI. Ultra2 SCSI has a bus speed of 40 MegaBytes per second in the
Narrow SCSI configuration and 80 MegaBytes in the Wide SCSI (Wide
Ultra2 SCSI) configuration.