
9
1.2 RAID Settings
The ATTO Configuration Tool provides the capability to configure disk
storage into RAID groups or Hot Spare drives.
Note: Even an individual JBOD disk is considered to be a RAID group.
Use the ATTO Configuration Tool to set up RAID groups on your
Sonnet RAID controller in one of the following RAID levels:
• JBOD
• RAID Level 0
• RAID Level 1
• RAID Level 4
• RAID Level 5
• RAID Level 6
• RAID Level 10
• DVRAID
DVRAID RAID groups may be set up automatically by the ATTO
Configuration Tool. All other RAID configurations require
customized input.
Each RAID group may be divided into one or more partitions;
each partition appears to the host operating system as a virtual
disk.
You may use the command line interface pane from the RAID
CLI tab in the ATTO Configuration Tool to set up or modify
various parameters (Refer to Appendix A). However, the menu-
based procedures listed in this chapter are the preferred
procedures for setting up RAID configurations for the Sonnet
RAID controller.
Preliminary Configuration Steps
1. Launch the ATTO Configuration Tool application.
2. The Configuration Tool main screen appears. See Figure 10
on page 12 for an overview of the screen. In the Device
Listing pane on the left side of the window, click ExpressSAS
Rxxx under localhost.
3. Click the RAID tab; attached drives are displayed in the top
pane, while RAID groups and Hot Spares are displayed in the
bottom pane.
DVRAID RAID Group Setup
The DVRAID wizard automatically sets up a DVRAID RAID
group using all available drives attached to the Sonnet RAID
controller. If you do not want all available drives set up in a
DVRAID RAID group, either remove the drives from the drive
enclosure, or select Custom RAID setup.
1. After completing Preliminary Configuration Steps on this
page, select RAID Management > Create Group > DVRAID
Setup from the application menu.
2. A dialog window will pop up, asking whether you want
to perform an Express Setup Operation of DVRAID; click
Yes. The ATTO Configuration Tool automatically uses all
unassigned drives to create a DVRAID RAID group. While the
RAID group is being created, a message box displays and the
panes display the RAID groups.
3. The RAID group must still be formatted by your computer’s
operating system software before it becomes available for use.
For Mac users, use Disk Utility; for Windows users, use Disk
Management. For more information on drive formatting, see
Mac OS Drive Formatting or Windows Drive Formatting on
page 11.
4. After formatting, RAID groups may be used during the setup
operation, but performance is limited until setup is complete.
Support Note: In the Device Listing pane of the ATTO
Configuration Tool window, the Sonnet RAID controller is
identified as an ExpressSAS Rxxx.
WARNING: After selecting the DVRAID, RAID 4, RAID 5,
or RAID 6 option, configuration of a set of eight 1TB
drives can take up to 4 hours (or up to 2 hours with 500GB
drives).
Windows Support Note: In order to create RAID
volumes larger than 2TB under Windows, you must do one
of the following: Select the 4KB sector size when creating
a custom RAID group (not DVRAID). -OR- Use the software
configuration tools included with the Fusion storage to create
volumes up to 2TB, concatenate (link together in a virtual chain)
the volumes, and then format as NTFS. -OR- Use GPT formatting.
Note that drives and volumes with GPT formatting are not visible
to any version of Windows XP Professional, nor to the 32-bit
version of Windows Server 2003 SP1.
Support Note: DVRAID is a customized, protected
RAID 4 configuration. It is optimized for increased digital
video playback performance when compared to that obtained
from a RAID 5 configuration. DVRAID’s write performance is
decreased in order to accomplish this optimization.
Support Note: In Fusion RAID systems shipped from
Sonnet with hard drives installed, the drives are formatted
Mac OS Extended (Journaled), and configured as a single RAID
5 RAID group. If you need to change the configuration, use the
ATTO Configuration Tool and the operating system software tools
to reformat and reconfigure the drives. See page xii for Quick
Format instructions for Mac OS and Windows users.