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Introduction
Drive Organization
The Ultra S2S RAID Controller organizes the connected drives as drive groups
and logical units.
Drive Groups
When using the Ultra S2S RAID Controller, up to eight individual disk drives can
be used together to form a pack or drive group. These physical drives make up the
array's logical unit capacity. The controller supports up to eight drive groups. The
number of drives in a drive group determines the possible RAID levels available
when configuring the array.
A new feature of the controller is known as Drive Sizing. This solution allows the
user to define how much of the drive's total capacity should be used. This permits
the user to make differently sized drives appear to all be the same size from the
perspective of the controller.
Logical Units (LUNs)
A logical unit (system drive) is that portion of a drive group (or a combination of
up to four drive groups) seen by the host system as a single logical device. Each
logical unit is identified by its logical unit number (LUN). The Ultra S2S RAID
Controller supports up to eight LUNs (system drives).
Use the VT100 utility or the AdminiStor PC Utilities (RAIDfx) to configure the
logical units from one drive group. Use only the AdminiStor PC Utilities to
configure logical units that span more than one drive group.
Drive Management
The Ultra S2S RAID Controller functions that monitor and control the operation
of the physical drives and logical units are instrumental to the controller's ability
to perform RAID management and automated error recovery tasks.
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Drive Organization
A LUN can span up to four (4) drive groups
A LUN can span up to a maximum of 32 drives
A maximum of eight (8) LUNs per drive group
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