3DM 2 Online Help

Exporting JBOD Disks
By default, JBOD disks (unconfigured disks) connected to the 3ware RAID controller are not exported to the operating system. This means that any drives you leave unconfigured are not seen by the operating system, and cannot be used for storage. When Export JBOD Disks is set to No, you make individual disks available for use by configuring them as Single Disks.
If you want unconfigured disks to be available on your computer, you can change this setting in 3BM or using the CLI.

Note: It is recommended that JBODs not be made available to the operating system. The advantages of working with configured Single Disks over JBOD are:
If interrupted, a single disk media scan will continue from where it left off, while a JBOD media scan must restart from the beginning.
Single disks can take advantage of the controller caching and configuration is persistent.
Single disks will be able to be migrated to redundant units in the future (e.g. A single disk will be able to be mirrored to another drive, creating a RAID 1 array).

Related Topics
  If JBOD disks are not exported to the operating system, they will appear as available drives in 3DM, and can be configured as single disks or spares, and included in other RAID configurations. If you change the policy to allow JBOD disks to be exported to the operating system, they will appear as units in 3DM if those drives were previously used as JBODs on another controller. AMCC recommends that new drives be configured as Singles and not JBODs.Viewing Controller Policies
  Setting the Auto Rebuild Policy
  Using Auto-Carving for Multi LUN Support
  Setting the Size of Volumes Created with Auto-Carving
  Enabling and Setting Up Staggered Spin-up

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