Raid 0 (Striping) - Xtore NASolution NP1040 User Manual

RAID level
t r e a t s m u l t i p l e d i s k s a s o n e v i r t u a l disk to increase
a c c e s s s p e e d . I t u s e s p a r i t y m o d e t o s t o r e
redundant data on a space equal to the size of one
disk for later data recovery. The actual available
s t o r a g e s p a c e i n a s y s t e m w i t h n d i s k s i s t h u s n -1
h a r d d i s k s .
RAID 5 RAID 5 w i t h h o t s p a r e a d d s o n e s p a r e d i s k t o t h e
with hot RAID 5 array, allocating one for redundancy and
spare t h e s e c o n d o n e a s a s p a r e . T h e a c t u a l a v a i l a b l e
s t o r a g e s p a c e i n a s y s t e m w i t h n d i s k s i s t h u s n -2
h a r d d i s k s .
Each of the RAID configurations offers a different disk capacity and
level of safety. When making your choice, consider the following:
1. The bigger the available space, the fewer safeguards the
system has.
2. In any RAID array, the logical capacity of the array is
determined by the hard disk with the smallest capacity. For
example, in a RAID 5 configuration with one 20 GB and three
30 GB hard disks, the total capacity available is equal to four 20
GB hard disks. Therefore you should always choose to combine
hard disks of equal size in the same array.
RAID 0 (strip ing)
In a RAID 0 array, data is split and stored in different locations, but
without fault tolerance. The server treats the array as one big disk,
with a size of almost all individual disks combined. The parallel access
to multiple disks allows for faster read and write, making the array
faster than individual disks. Because of that, this configuration is ideal
for applications where large amounts of streaming data have to be
Windows access to NP1040
NFP Storage Manager 1.1 User's Manual
Functionality
147