Proware DP-503-F4A3, Installation And User Manual

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DP-503-F4A3 RAID SUBSYSTEM
20 Installation and User Manual
A Raid Set is a group of disk drives containing one or more logical volumes called Volume Sets. It is
not possible to have multiple Raid Sets on the same disk drives.
A Volume Set must be created either on an existing Raid Set or on a group of available individual
disk drives (disk drives that are not yet a part of a Raid Set). If there are existing Raid Sets with
available raw capacity, new Volume Set can be created. New Volume Set can also be created on an
existing Raid Set without free raw capacity by expanding the Raid Set using available disk drive(s)
which is/are not yet Raid Set member. If disk drives of different capacity are grouped together in a
Raid Set, then the capacity of the smallest disk will become the effective capacity of all the disks in
the Raid Set.
1.5.2 Volume Set
A Volume Set is seen by the host system as a single logical device. It is organized in a RAID level
with one or more physical disks. RAID level refers to the level of data performance and protection
of a Volume Set. A Volume Set capacity can consume all or a portion of the raw capacity
available in a Raid Set. Multiple Volume Sets can exist on a group of disks in a Raid Set.
Additional Volume Sets created in a specified Raid Set will reside on all the physical disks in the
Raid Set. Thus each Volume Set on the Raid Set will have its data spread evenly across all the disks
in the Raid Set. Volume Sets of different RAID levels may coexist on the same Raid Set.
In the illustration below, Volume 1 can be assigned a RAID 5 level while Volume 0 might be assigned
a RAID 0+1 level.
1.5.3 Easy to Use Features
1.5.3.1 Instant Availability/Background Initialization