26 Intel
®
RAID Software User’s Guide
the drive to be operated with legacy OS and hardware products that do not support 4K byte
sectors. Intel
®
plans to implement 4K sector support on all new products, beginning with those
designed to utilize the LSI 2208 and LSI2308 SAS products. Currently shipping Intel
®
RAID
and SAS products will support 4K sector drives running in legacy 512b sector mode.
Larger than 2TB Drive Support
The disk drive industry is in transition to support disk drives with volume size larger than 2
Terabytes. The Intel
®
6G SAS PCIe Gen2 RAID Controllers can fully recognize and configure
the volume of these disk drives. For the other RAID types listed in “Supported Hardware”
section, there is no problem for the first 2TB space of the disk drive to be recognized and
configured.
Power Save settings
The controller conserves energy by placing certain unused drives into powersave mode. The
controller will automatically spin up drives from powersave mode whenever necessary. Drives
that can be set to power save mode are: Unconfigured Drives, Hot Spare Drives, Configured
Drives. The setting can be made in either RAID BIOS Console 2, or RAID Web Console 2.
There is also a way to disable this setting from CmdTool2, by typing:
CmdTool2 -LDSetPowerPolicy -None -Lall -a0
This command only has effect when one or more logical drives are created. The Power Save
mode currently is only supported by Intel
®
Intelligent RAID products.
Shield State
Physical devices in RAID firmware transit between different states. If the firmware detects a
problem or a communication loss for a physical drive, the firmware transitions the drive to a
bad (FAILED or UNCONF BAD) state. To avoid transient failures, an interim state called the
Shield State is introduced before marking the drive as being in a bad state.
The Shield State is an interim state of a physical drive for diagnostic operations. The results of
the diagnostic tests determine if the physical drive is good or bad. If any of the diagnostic tests
fail, the physical drive transitions to a bad state (FAILED or UNCONF BAD).
The three possible Shield States are:
• Unconfigured - Shielded
• Configured - Shielded
• Hotspare - Shielded
Physical View and Logical View in either RAID BIOS Console 2 or RAID Web Console 2 can
reflect drive Shield State. Other drive states include:
• Unconfigured Good
• Online
• Hotspare
• Failed
• Rebuilding
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