Hardware User's Guide

18 Intel® RAID Controller RS25FB044 Hardware User’s Guide
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 ass
ociated 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
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.
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.