95
RAID 1
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.
Stripe
n across multiple hard disks. Data is
wri
s of a RAID. Since multiple disks
are cc
can va
Disk
When
ge
percen
RAID Level
Percentage Used
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
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
single large disk.
data on JBOD is not protected, one drive failure could result total data l
Size
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.
Usage
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%