3Ware 9550SXU16MLB10 User Guide - Page 86

Configuring Your Controller Auto-carving divides the available unit capacity into multiple chunks of 2 TB or smaller that can be addressed by the operating systems as separate volumes. These chunks are sometimes known as multiple LUNs (logical units), however through the 3ware documentation, they are referred to as volumes. 3ware firmware supports a maximum of 8 volumes per controller, up to a total of 16 TB. Note: Operating systems without this limitation include Linux 2.6 and FreeBSD 5.x. Microsoft plans to overcome this limitation in Win XP-64bit and Windows 2003, SP 1. You must turn on the 2TB Auto-Carving policy before creating the unit. Units created with this policy turned off will not be affected. If the policy is turned off later, units that have been carved into volumes will retain their individual volumes; existing data is not affected. To use auto-carving 1 Enable the 2 TB auto-carving feature. You can do so using 3DM, 3BM, or the 3ware CLI. In 3DM, enable 2TB auto-carving at the bottom of the Management > Controller Settings page. In 3BM, you enable auto-carving on the Policies page. In CLI, use the command tw_cli /cx set autocarve=on. For more information, see the 3ware 9000 Series Serial ATA RAID Controller CLI Guide. 2 Create a new unit or migrate an existing unit to include the drives you want to use. With auto-carving enabled, if the combined capacity of the drives exceeds 2 TB, up to 8 individual 2 TB volumes will be created from the unit. For example, a 5 TB unit would become 3 volumes; two 2 TB volumes and one 1 TB volume. 3 Verify the creation of the volumes through 3DM 2 or the CLI. In 3DM 2, the number of volumes is shown on the Unit Details page. 4 Verify that the volumes appear in the operating system. They will appear as additional drives. 80 3ware 9000 Series Serial ATA RAID Controller User Guide