American Megatrends MegaRAID Express 500 Manual Do Utilizador
Chapter 2 Introduction to RAID
15
Logical Drive
A logical drive is a partition in a physical array of disks that is made up of
contiguous data segments on the physical disks. A logical drive can consist of:
contiguous data segments on the physical disks. A logical drive can consist of:
•
an entire physical array
•
more than one entire physical array
•
a part of an array
•
parts of more than one array, or
•
a combination of any two of the above conditions
Hot Swap
A hot swap is the manual replacement of a defective physical disk unit while the
computer is still running. When a new drive has been installed, you must issue a
command to rebuild the drive.
computer is still running. When a new drive has been installed, you must issue a
command to rebuild the drive.
SCSI Drive States
A SCSI disk drive can be in one of these states:
State
Description
Online
(ONLIN)
The drive is functioning normally and is a part of a configured logical
drive.
drive.
Ready
(READY)
The drive is functioning normally but is not part of a configured logical
drive and is not designated as a hot spare.
drive and is not designated as a hot spare.
Hot Spare
(HOTSP)
The drive is powered up and ready for use as a spare in case an online
drive fails.
drive fails.
Fail
(FAIL)
A fault has occurred in the drive placing it out of service.
Rebuild
(REB)
The drive is being rebuilt with data from a failed drive.
Logical Drive States
State
Description
Optimal
The drive operating condition is good. All configured drives are online
Degraded
The drive operating condition is not optimal. One of the configured drives
has failed or is offline.
has failed or is offline.
Failed
The drive has failed.
Offline
The drive is not available to MegaRAID Express 500.