Raid 1; Raid 5; Jbod; Stripe Size - Thecus IP Storage Appliance N3200PRO User Manual

RAID 1

RAID 1 mirrors all data from one hard disk drive to a sec
thus providing complete data redundancy. However, the cost of data storage
capacity is do ubled.
This is excellent for complete data security.

RAID 5

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.

JBOD

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 re merely concatenated together, end to beginning, so they appear to be a
single large disk.
As the data on JBOD is not protected, one drive failure could result total data l
Stripe Size
The length of the data segments being writte
wri tt en in stripes across the multiple hard disk
are cc a essed at the same time, disk striping enhances performance. The stripes
can va ry in size.
Disk Usage
When all 3 disks are of the same size, and used in RAID, N3200PRO disk usa
percen tage is listed below:
rity such as office automation and online
plications with high read requests but low
RAID Level Percentage Used
RAID 0
RAID 1
RAID 5
JBOD
95
ond one hard disk drive,
n across multiple hard disks. Data is
s of a RAID. Since multiple disks
100%
50%
66%
100%
ks
o
h
isks") is
oss.
ge