User Guide

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About RAID
In order to provide optimal storage space utilization and data protection, ADM supports
multiple RAID levels allowing you to select the appropriate level for your needs. The following
volume types levels are all supported by ADM:
Non-RAID Volume Types
Single:
Only uses a single disk in the creation of storage space. This configuration does not offer any
type of data protection.
JBOD:
An acronym for “just a bunch of disks”, JBOD uses a combination of two or more disks to
create storage space. The total storage capacity is the capacities of all the disks added together.
The advantage of this configuration is that it allows you to use different sized disks together and
provides a large amount of storage space. The downside is that it does not offer any sort of data
protection.
RAID Volume Types
RAID 0:
Uses a combination of two or more disks to create storage space. The total storage capacity is
the capacities of all the disks added together. The advantage of this configuration is that it
allows you to use different sized disks together and provides a large amount of storage space.
Also, data in RAID 0 volumes is accessed in parallel which provides improved performance. The
downside is that RAID 0 does not offer any sort of data protection.
RAID 1:
In RAID 1 your data is written identically on two disks, thereby producing a “mirrored set”.
Exactly the same data is stored on the two disks at all times. RAID 1 protects your data from loss
should one of your disks fail. RAID 1's advantage is that it offers protection for your data by
providing data redundancy. The downside of this configuration is that when combining two
disks of differing sizes, the total storage space will be equal to the size of the smaller disk.
Therefore, you will be unable to use a portion of the larger disk.
Total available storage space = (size of smaller disk) * (1)