Intel AXXRMS2LL040, Руководство пользователя по оборудованию

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22 Intel® RAID Module RMS2LL040 and RMS2LL080 Hardware User’s Guide
Enclosure Management Support
The Intel
®
RAID Module RMS2LL040 and RMS2LL080 support SES2 enclosure
management in-band to expander-based backplanes and out-of-band to direct-connect
backplanes. These RAID Controllers also support SGPIO enclosure management
interface.
RAID Functionality and Features
Hierarchy
The fundamental purpose of a RAID system is to present a usable data storage medium
(virtual drive) with some level of redundancy to a host operating system. The Intel®
RAID firmware is based on the concept of associating physical drives in arrays and then
creating a virtual drive from that array that includes a functional RAID level. To create a
virtual drive and present it to the host operating system, the RAID firmware typically
follows these steps:
1. One or more physical drives are selected and associated as an array.
2. One or more arrays are associated and given a RAID level. This process creates a
virtual drive and provides an option to initialize the virtual drive.
3. The RAID firmware presents the virtual drive to the operating system.
RAID Virtual Drive Status
Table 7. RAID Virtual Drive Status
RAID Controller Drive Limitations
Only drives that comply with the SAS and SATA specification extensions are supported.
SAS Bus and ID Mapping
Devices on the SAS bus are persistently mapped based on a SAS address.
Drive State Code Description
Optimal Optimal The drive operating system is good. All config-
ured drives are online.
Degraded Degraded The drive operating condition is not optimal
because one of the configured drives has failed
or is offline.
Offline Offline The drive is not available to the operating system
and is unusable.