Thecus Technology IP Storage Appliance N3200PRO Manuale Utente

 

 
 

95 

ond one hard disk drive, 

thus providing complete data redundancy. However, the cost of data storage 

ubled.  

ks 

rity such as office automation and online 

plications with high read requests but low 

o 

h 

isks") is 

re merely concatenated together, end to beginning, so they appear to be a 

 
As the

oss. 

 

n across multiple hard disks. Data is 

wri

s of a RAID. Since multiple disks 

are cc

can va

When 

ge 

percen

 

RAID 1 mirrors all data from one hard disk drive to a sec

capacity is do
 

This is excellent for complete data security. 

RAID 5 offers data security and good performance. It is best suited for networ

that perform many small I/O transactions at the same time, as well as 
applications that require data secu

customer service. Use it also for ap
write requests. 
 

RAID 5 includes disk striping at the byte level and parity information is written t
several hard disk drives. If a hard disk fails the system uses parity stored on eac

of the other hard disks to recreate all missing information. 

Although a concatenation of disks (also called JBOD, or "Just a Bunch of D

not one of the numbered RAID levels, it is a popular method for combining 
multiple physical disk drives into a single virtual one. As the name implies, disks 

a
single large disk. 

 data on JBOD is not protected, one drive failure could result total data l

The length of the data segments being writte

en in stripes across the multiple hard disk

tt

 a essed at the same time, disk striping enhances performance. The stripes 

ry in size.   

all 3 disks are of the same size, and used in RAID, N3200PRO disk usa

tage is listed below: 

RAID 0 

100% 

RAID 1 

50% 

RAID 5 

66% 

JBOD 100%