AMCC 720-0138-00 ユーザーズマニュアル

Chapter 4. Configuring Your Controller

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1

Choose 

 from the menu bar in 3DM.

2

In the Other Controller Settings section at the bottom of the screen, select 
the 

 option for 

.

The page refreshes, and a message at the top confirms the change you 
have made.

Using Auto-Carving for Multi LUN Support

When the Auto-Carving policy is on, any unit larger than a specified size 
(known as the carve size) is created as multiple volumes that can be addressed 
by the operating system as separate volumes. These chunks are sometimes 
known as multiple LUNs (logical units). However, throughout the 3ware 
documentation, they are referred to as volumes. 

For example, using the default carve size of 2 TB, if the unit is 2.5 TB then it 
will contain two volumes, with the first volume containing 2TB and the 
second volume containing 0.5 TB. If the unit is 5.0 TB then it will contain 3 
volumes, with the first two volumes containing 2 TB each and the last volume 
containing 1 TB. 

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 2 TB (1024 MB to 2048 MB). 3ware firmware supports a maximum 
of 8 volumes per controller, up to a total of 16 TB. 

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. 

1

Enable the auto-carving feature. 

In 3DM, enable Auto-Carving at the bottom of the 

 page. 

 

Using auto-carving can have an impact on performance.