HP Insight Management Agents - Manual (Page 34)

Logical drives
This is a list of logical drives that includes this physical drive as a member. Select one of the listed
logical drives to see more information about the drive.
IDE ATA logical drives
A list of logical drives associated with the controller displays in the Mass Storage submenu. Each
logical drive in the list displays the condition, logical drive number and the fault tolerance of
that logical drive. Select one of the logical drive entries to display the following information.
• Status—Displays the status of the logical drive. The logical drive can be in one of the following
states:
— OK—Indicates that the logical drive is in normal operation mode.
— Degraded—Indicates that at least one physical drive has failed, but the logical drive’s
RAID level lets the drive continue to operate with no data loss.
— Rebuilding—Indicates that the logical drive is rebuilding a physical drive. When
complete, the logical drive returns to normal operation.
— Failed—Indicates that more physical drives have failed than the RAID level of the logical
drive can handle without data loss.
— Unknown—The agent cannot determine the logical drive status. You might need to
upgrade your software.
• Fault Tolerance—Displays the fault tolerance mode of the logical drive. The following values
are valid:
— RAID 0—Fault tolerance is not enabled. Data loss occurs for that logical drive if one
physical drive fails.
— RAID 1—Drive mirroring is the highest level of fault tolerance. It is the only method
offering fault tolerance protection if no more than two physical drives are selected.
Drive mirroring creates fault tolerance by storing duplicate data on two drives. This is
the most costly fault tolerance method because it requires 50 percent of the drive capacity
to store the redundant data. If a physical drive fails, the mirror drive provides a backup
copy of the files and normal system operations are not interrupted.
— RAID 0+1—Drive mirroring is the highest level of fault tolerance. There must be four
drives for RAID 0+1. This is the most costly fault tolerance method because it requires
50 percent of the drive capacity to store the redundant data. If a physical drive fails, the
mirror drive provides a backup copy of the files and normal system operations are not
interrupted. This mirroring feature can withstand multiple simultaneous drive failures
as long as the failed drives are not mirrored to each other.
— Unknown—The agent cannot determine the RAID level of this logical drive. You might
need to upgrade your software.
• Capacity—Displays the size of the logical drive.
• Stripe Size—Displays the size of a logical drive stripe in kilobytes.
• Disk Rebuilding—Identifies the physical drive that is being rebuilt. The identity of the
physical drive only displays when the status of the logical drive is Rebuilding, otherwise,
N/A displays.
Physical drives
This is a list of physical drives that make up the logical drive. Select one of the listed physical
drives to see more information about the drive.
Spare drives
This is a list of physical drives that can be used to replace a failed physical drive if the fault
tolerance mode is RAID 1 or RAID 0+1. Select one of the listed spare drives to see more information
about the drive.
34 Agent information