HP Insight Management Agents - Manual (Page 33)

◦ 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.
Drive Array Controllers
This section displays general and status information about drive arrays. Select a drive array
controller entry from the Mass Storage list to display a submenu containing separate entries for
Array Controller Information, Physical Drives, Logical Drives, and storage system information. The
following items display:
Array Controller Information
Select an array controller from the Mass Storage list to display information for the controller.
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