H3C UniServer R4900 G3 User Manual

1
Configuring an HBA-1000-M2-1 storage
controller
About the HBA-1000-M2-1 storage controller
The HBA-1000-M2-1 storage controller supports 6-Gbps and 12-Gbps SAS/SATA data channels.
For detailed storage controller information, contact Technical Support.
Features
Operating modes
The storage controller supports the following operating modes:
•
HBA mode—In this mode, physical drives attached to the storage controller are exposed as
raw drives and RAID functions are disabled.
•
RAID mode—In this mode, RAID functions are enabled and RAID arrays can be created on
physical drives. Only logical drives are exposed to the operating system.
•
Mixed mode—This is the default mode. In this mode, RAID functions are enabled and RAID
arrays can be created on physical drives. Both logical drives and raw physical drives are
exposed to the operating system.
IMPORTANT:
•
The operating system might fail to start up after the operating mode of the storage controller is
changed. To resolve the issue, re-install the operating system. If the issue persists, contact
Technical Support.
•
If the storage controller has RAID configuration, you must clear RAID configuration before
changing the operation mode of the storage controller to HBA mode. The new operating mode
takes effect after the server reboots.
• For the new mode to take effect, restart the server after an operating mode change.
RAID levels
Table 1 shows the minimum number of drives required by each RAID level and the maximum
number of failed drives supported by each RAID level. For more information about RAID levels, see
"Appendix B RAID arrays and fault tolerance."
Table 1 RAID levels and the numbers of drives for each RAID level
RAID level
Min. drives required
Max. failed drives
RAID 0 1 0
RAID 1 2 1
RAID 10 4 n, where n is the number of RAID 1 arrays in the RAID 10 array.
Hot spare drives
You can configure hot spare drives to improve data security. A hot spare drive is a standby drive that
does not store any data. When a drive in a redundant RAID fails, a spare drive automatically
replaces the failed drive and rebuilds the data of the failed drive.

H3C UniServer R4900 G3 Specifications

General

Brand	H3C
Model	UniServer R4900 G3
Category	Server
Language	English