LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide
March 2014
Chapter 2: Introduction to RAID
Components and Features
2.1.15
Hot Swap
A hot swap is the manual replacement of a defective drive unit while the computer is still running. When a new drive
has been installed, a rebuild occurs automatically if these situation occurs:
The newly inserted drive is the same capacity as or larger than the failed drive.
The newly inserted drive is placed in the same drive bay as the failed drive it is replacing.
The RAID controller can be configured to detect the new drives and rebuild the contents of the drive automatically.
2.1.16
Drive States
A drive state is a property indicating the status of the drive. The drive states are described in the following table.
Table 4 Drive States
2.1.17
Virtual Drive States
The virtual drive states are described in the following table.
Table 5 Virtual Drive States
2.1.18
Beep Codes
An alarm sounds on the MegaRAID controller when a virtual drive changes from an optimal state to another state,
when a hot spare rebuilds, and for test purposes.
State
Description
Online
A drive that can be accessed by the RAID controller and is part of the virtual drive.
Unconfigured Good A drive that is functioning normally but is not configured as a part of a virtual drive or as a hot spare.
Hot Spare
A drive that is powered up and ready for use as a spare in case an online drive fails.
Failed
A drive that was originally configured as Online or Hot Spare, but on which the firmware detects an
unrecoverable error.
Rebuild
A drive to which data is being written to restore full redundancy for a virtual drive.
Unconfigured Bad
A drive on which the firmware detects an unrecoverable error; the drive was Unconfigured Good or the drive
could not be initialized.
Missing
A drive that was Online but which has been removed from its location.
Offline
A drive that is part of a virtual drive but which has invalid data as far as the RAID configuration is concerned.
State
Description
Optimal
The virtual drive operating condition is good. All configured drives are online.
Degraded
The virtual drive operating condition is not optimal. One of the configured drives has failed or is offline.
Partial Degraded
The operating condition in a RAID 6 virtual drive is not optimal. One of the configured drives has failed or is
offline. RAID 6 can tolerate up to two drive failures.
Failed
The virtual drive has failed.
Offline
The virtual drive is not available to the RAID controller.
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