Installation guide

Glossary
G-10 GAM Client v3.00 and WSAM User’s Manual
☛ Note
The host operating system drivers and software
utilities remain unchanged regardless of the level of
RAID installed. The controller makes the physical
configuration and RAID level implementation
transparent to the host operating system.
Replacement Table
A replacement table contains information regarding which devices have been
replaced by others through standby replacement.
Rotated XOR Redundancy
This term (also known as “parity” or “consistency data”) refers to a method
of providing complete data redundancy while requiring only a fraction of the
storage capacity of mirroring. In a system configured under RAID 3 or
RAID 5 (which require at least three drives), all data and parity blocks are
divided between the drives in such a way that if any single drive is removed
(or fails), the data on it can be reconstructed using the data on the remaining
drives. (XOR refers to the Boolean “Exclusive-OR” operator.) In any RAID
3 or RAID 5 array, the capacity allocated to redundancy is the equivalent of
one drive.
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.
Session
Refers to the period of time between any two consecutive system shutdowns.
System shutdown may be either a power off/on, or a hardware reset.
Simplex Mode
See “Single Controller (Simplex) Mode” .