ACTi XNR-4200 V1.02.13 User Manual
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XNR-4200 User’s Manual 1.02.13
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.
RAID 5
RAID 5 is probably the most popular configuration of all because it provides both disk recovery
options and quite efficient use of storage space. Furthermore, the more hard disks you add
into RAID 5 configuration, the faster will be the writing and reading speed, for the similar
reason as in case of RAID 0. In RAID 5 configuration, the
data blocks are considered the same data group or a stripe.
Certain special portion of data that is created based on the
values of other data blocks for recovery purposes. Such
value is called parity. The parity information is distributed
and stored across each hard drive. If any of the hard drive
fails, the array enters downgrade mode, all that you need to
do is replace the failed disk with a new one.
RAID 10
RAID 10 (also called 1+0) combines RAID 1 and RAID 0
configurations
– think of it as a group of mirrored disks. From
that it is possible to conclude that there has to be even
number of disks and at least two pairs, which means that you
can use 4 or 6 disks for XNR-4200.