Using auto-carving for multi lun support – Avago Technologies 3ware 9650SE-12ML (Channel) User Manual
Page 104
Configuring Your Controller
92
3ware SAS/SATA RAID Software User Guide, Version 9.5.1
To enable Auto Rebuild through 3DM
1
Choose
Management > Controller Settings
from the menu bar in 3DM.
2
In the Other Controller Settings section at the bottom of the screen, select
the
Enabled
option for
Auto Rebuild
.
The page refreshes, and a message at the top confirms the change you
have made.
To enable Auto-Rebuild through 3BM
1
On the main 3BM screen,
Tab
to
Settings
and press
Enter
.
2
On the pop-up menu, select
Controller Policies
and press
Enter
.
3
On the Policy Settings page,
Tab
to the
Auto-Rebuild
field, press
Enter
to display the options, select
Enable
and press
Enter
again to select it.
4
Tab
to
OK
and press
Enter
to select it.
The policy is enabled immediately.
Using Auto-Carving for Multi LUN Support
Auto-carving is useful for creating multiple volumes out of large arrays at the
hardware level. Then, when you boot to the operating system, each volume
appears as a different disk drive, simplifying the partitioning required at the
operating system level.
A second use of auto-carving is to gain use of the full capacity of units greater
than 2 TB in older operating systems. This is because Windows 2003 (
32-bit
and 64-bit
without SP1), Windows XP (32-bit), and FreeBSD 4.x, do not
currently recognize unit capacity in excess of 2 TB. For more information see,
http://www.3ware.com/kb/article.aspx?id=13431.
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. (
Note:
If a specific Boot Volume was also specified in 3BM
or CLI, the first volume will be the size specified for the Boot Volume, and
then the carve size will be applied to the remainder of the unit. For more
information, see “Boot volume size” on page 103.)