Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 105)

Using Auto-Carving for Multi LUN Support
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Each volume can be treated as an individual disk with its own file system. The
default carve size is 2 TB; you can change this to a setting in the range of
1 TB to 32 TB (1024 GB to 32768 GB). 3ware firmware supports a maximum
of 32 volumes per controller, up to a total of 32TB.
If you are migrating a unit to a size that is larger than the carve size and auto-
carving is on, multiple volumes will be created.
You must turn on the Auto-Carving policy before creating the unit. Units
created with this policy turned off will not be affected by a change to the
policy. 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 auto-carving feature. You can do so using 3DM or 3BM.
In 3DM, enable Auto-Carving at the bottom of the Management >
Controller Settings page.
In 3BM, you enable Auto-Carving on the Settings > Controller Policies
page.
Note: CLI now provides the ability to specify variable sizes for the first 4 volumes of
a unit when autocarving. This is done while creating a unit with the /cx add type
command attribute [v0=n|vol=a:b:c:d]. See the 3ware SAS/SATA RAID
Controller CLI Guide.
Note: Carving a unit into multiple volumes can have an impact on performance.
Note: Operating systems without the 2TB limitation include Linux 2.6, FreeBSD 5.x
or later, Windows XP (64bit), Windows 2003 (32-bit and 64-bit with SP1 or newer),
Windows 2008 (32-bit and 64-bit) and Windows Vista.
Even though the Linux 2.6 kernel supports partitions larger than 2 TB, the installers
for SuSE and Redhat do not. Turn auto-carving on to prevent the installation from
failing.