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Document Number: MAN-0057XX-000 Version 1.0
Hard drive A and B are concatenated into a single virtual volume in the Figure below with a
storage capacity that is equal to the sum of each of the physical hard drives A and B.
SteelVine
Drive B
Virtual BIG
volume
Port 0
Port 1
Capacity is Drive A
plus Drive B
Drive A
+
Figure 2 - BIG storage policy sample configuration
It is also possible to create a BIG volume using only a single hard disk drive connected to Port 0,
and then increase the storage capacity of the volume later by adding another hard disk drive (or
another SteelVine Storage Processor with at least one hard disk drive) to Port 1 and pressing the
Mode Change push-button. The new disk blocks of Port 1 will be concatenated to the end of the
disk blocks of Port 0, and any data that is stored on the existing BIG volume will be preserved.
However, it is not possible to expand an existing BIG volume by adding another hard disk drive
to Port 0 and still preserve any existing data on that volume.
JBOD
The JBOD (Just a Bunch of Disks) storage policy enables each hard drive to be seen separately
as one drive. When using a SATA host controller, JBOD should only be used if the SATA host
controller provides Port Multiplier (PM) support. If a host is not PM-aware, only a single drive
is presented (drive 0). No such limitation if using a USB host connection.
JBOD storage policy is available in the SteelVine Manager for a standalone (non-cascaded)
Storage Processor or the top-level node of a cascaded configuration, but not for subordinate
nodes. Even though you can
use the rotary switch to select JBOD mode for any node in a
cascaded configuration, only the first
JBOD volume of any subordinate node is detected by your
host. Therefore, selecting JBOD mode for any subordinate node is not recommended.
In a JBOD configuration, the SteelVine Storage Reference Design directly exposes each
physical drive.
SteelVine
Drive A Drive B
Port 0
Port 1
Figure 3 - JBOD storage policy sample configuration
57XX-Series SteelVine Manager User's Guide
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