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MegaRAID SAS Software User Guide Chapter 2: Introduction to RAID
| RAID Levels
2.4.17 Virtual Drive States The virtual drive states are described in Table5.
2.4.18 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.
2.4.19 Enclosure Management Enclosure management is the intelligent monitoring of the disk subsystem by software
and/or hardware. The disk subsystem can be part of the host computer or can reside in
an external disk enclosure. Enclosure management helps you stay informed of events
in the disk subsystem, such as a drive or power supply failure. Enclosure management
increases the fault tolerance of the disk subsystem.
2.5 RAID Levels The RAID controller supports RAID levels 0, 00, 1, 5, 6, 10, 50, and 60. The supported
RAID levels are summarized in the following section.
In addition, it supports independent drives (configured as RAID 0 and RAID 00.) The
following sections describe the RAID levels in detail.
Table 5: Virtual Drive States
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.
Table 6: Beep Codes, Events, and Virtual Drive States
Event Virtual Drive State Beep Code
RAID 0 virtual drive loses 1 or more
virtual drives
Offline 3 seconds on and 1 second off
RAID 1 loses a mirror drive Degraded 1 second on and 1 second off
RAID 1 loses both drives Offline 3 seconds on and 1 second off
RAID 5 loses 1 drive Degraded 1 second on and 1 second off
RAID 5 loses 2 or more drives Offline 3 seconds on and 1 second off
RAID 6 loses 1 drive Partially
Degraded
1 second on and 1 second off
RAID 6 loses 2 drives Degraded 1 second on and 1 second off
RAID 6 loses more than 2 drives Offline 3 seconds on and 1 second off
A hot spare completes the rebuild
process and is brought into a drive
group
N/A 1 second on and 3 seconds off
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