Installation guide

G-10 AcceleRAID Installation Guide
Stripe Order
The order in which SCSI disk drives appear within a drive group. This order
must be maintained, and is critical to the controller’s ability to ‘Rebuild’
failed drives.
Stripe Size
The stripe size is defined as the size, in kilobytes (1024 bytes) of a single I/O
operation. A stripe of data (data residing in actual physical disk sectors,
which are logically ordered first to last) is divided over all disks in the drive
group.
Stripe Width
The number of striped SCSI drives within a drive group.
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).