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1.2 Terminology
The document uses the following terms:
RAID
RAID is the abbreviation of
“R
edundant
A
rray of
I
ndependent
D
isks
”
. There are different RAID levels with different degree
of the data protection, data availability, and performance to
host environment.
PD
The
P
hysical
D
isk belongs to the member disk of one specific
RAID group.
RG
R
aid
G
roup. A collection of removable media. One RG
consists of a set of VDs and owns one RAID level attribute.
VD
V
irtual
D
isk. Each RD could be divided into several VDs. The
VDs from one RG have the same RAID level, but may have
different volume capacity.
CV
C
ache
V
olume. Controller uses onboard memory as cache.
All RAM (except for the part which is occupied by the
controller) can be used as cache.
LUN
L
ogical
U
nit
N
umber. A logical unit number (LUN) is a unique
identifier which enables it to differentiate among separate
devices (each one is a logical unit).
GUI
G
raphic
U
ser
I
nterface.
RAID width,
RAID copy,
RAID row
(RAID cell in
one row)
RAID width, copy and row are used to describe one RG.
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.
3. One RAID 10 volume over 3 4-disk RAID 1 volume:
Caution
Snapshot / rollback features need
512MB
RAM or more.
Please refer to RAM certification list in Appendix A for more
detail.
Summary of Contents for i8500
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