Thecus Technology i Series User Manual

 

 
The document uses the following terms: 
 

 

RAID is the abbreviation of “Redundant Array of Independent 
D

isks”.  There are different RAID levels with different degree 

of the data protection, data availability, performance to host 
environment. 

 

The Physical Disk belongs to the member disk of one specific 
volume group. 

 

olume  Group. A collection of removable media. One VG 

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

 

 

ser  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. 

 

 

ache Volume. i Series uses the 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 sharing among all UDVs. Each UDV will be 
associated with one CV for data transaction. Each CV could 
be assigned different cache memory size. 

 

ogical  Unit  Number. A logical unit number (LUN) is an 

unique identifier used on a iSCSI connection which enables it 
to differentiate among separate devices (each of which is a 
logical unit). 

raphic User Interface. 

 

(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. 

3.  One RAID 10 volume over 3 4-disk RAID 1 volume: 

RAID width=1; RAID copy=4; RAID row=3. 

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