Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 116)

Configuring Units
104 3ware SAS/SATA RAID Software User Guide, Version 9.5.1
Multiple Volumes
When you create a unit through CLI, you have the option of creating up to
four volumes with variable, defined sizes. If you have enabled the Auto-
Carving policy, these units will be created first, and then the carve size will be
used to segment the remaining drive space into additional volumes. For
details, see the /cx add command in the 3ware SAS/SATA RAID Controller
CLI Guide.
Initialization Method
In 3BM, you can choose to do a foreground (default) or background
initialization of the unit. 3DM and CLI can only use background initialization
when creating a unit.
A foreground initialization will take place before the system is booted. It can
take up to several hours, depending on the size of the unit.
A background initialization allows you to have immediate use of the unit, but
will take longer and slows down performance of the unit until it completes.
If your unit starts a foreground initialization and you want to use it
immediately, you can press
Esc and the unit will switch to using background
initialization.
Unit policies
Several unit policies are set when you create a new unit:
• Write Cache (enabled, by default)
• Drive Queuing (enabled, by default)
• Ignore ECC (Continue on Source Error When Rebuilding (disabled, by
default))
• StorSave Profile (Protection, by default)
• Auto Verify (enabled, by default)
• Rapid RAID Recovery (enabled, by default)
The particular policies that you can adjust when you create the unit vary,
depending on which program you are using: 3DM, 3BM, or the CLI.
You can change all of these policies after the unit has been created, with one
exception. If Rapid RAID Recovery is disabled, it cannot be enabled later.
For a summary of what these policies do, see the discussion under “Setting
Unit Policies” on page 116. For how to adjust each one, see the procedures
later in this chapter.