ACTi INR-410 INR-420 V3.0.09 - Manual (Page 26)

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INR-410/420 System Administrator’s Manual
26
Striped
( RAID 0 )
RAID 0 combines multiple hard drives into one larger volume. The data is split
between these disks. Under this configuration every
inserted disk will be used for storing data. No disks
are used for data backup purposes. Should one of
the disks be damaged, the recordings on all disks
will be lost and are not recoverable, and the use of
all remaining disks will be suspended until the
broken disk has been replaced and the whole RAID
configuration has been reset.
Mirrored
(RAID 1)
RAID 1 is a solution designed to make mirror copy of from one disk onto one
or more disks for recovery purposes. In case of ACTi Standalone NVR
servers, you need to have exactly 2 disks to configure RAID 1. Since the 2 nd
disk is used as a mirror of the first disk, the total
available storage will be twice smaller compared to
RAID 0. On the other hand, if one of the two disks
fails then the system will still keep running on
another disk without any problems. Once you
replace the damaged hard disk, all the information
will be copied from a healthy disk into the newly
added disk, to recover a healthy RAID 1 condition.
Volume Type Comparison
Volume Type Simple Spanned Striped Mirrored
Corresponding RAID Type JBOD RAID 0 RAID 1
Minimum Number of
Disks required
1 2 2 2
Capacity V V
1
+V
2
+
…
+V
N
V
min
x N V
min
*Storage Efficiency     
Fault Tolerance None None None 
Write Speed
      
Read Speed      
N = the number of disks
V
min
= the volume of the disk with the smallest volume in the array
*This result is obtained based on the assumption that the disks are of the same volume size.