User manual

1.2 Terminology

The document uses the following terms:

RAID

RAID is the abbreviation of “Redundant Array of Independent

Disks”. There are different RAID levels with different degree

of data protection , data availability, and performance to the

host environment.

The Physical Disk is a member disk of one specific volume

group.

VG Volume Group. A collection of removable media . One VG

consists of a set of UDVs and owns one RAID level attribute.

UDV

User Data Volume. Each VG could be divided into several

UDVs. The UDVs from one VG share the same RAID level,

but may have different volume capacity.

Cache Volume. ISC8P2G -S uses t he on board memory as

cache. All RAM (except for the part which is occupied by the

controller) can be used as cache. User can divide the cache

for one UDV or share among all UDVs. Each UDV will be

associated with one CV for data transaction. Each CV could

be assigned different cache memory sizes.

LUN Logical Unit Number. A logical unit number (LUN) is a unique

identifier used on an iSCSI connection which enables it to

differentiate among separate devices (each of which is a

logical unit).

GUI Graphical User Interface.

RAID width,

RAID copy,

RAID row

(RAID cell in

one row)

RAID width, copy and row are used to describe one VG.

E.g.:

1. One 4-disk RAID 0 volume: RAID width= 4; RAID

copy=1; RAID row=1.

2. One 3-way mirroring volume: RAID width=1; RAID

copy=3; RAID row=1.