Intel AXXRMS2LL080 Hardware User Guide - Page 32

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 Drive State Optimal Degraded Code Optimal Degraded Offline Offline Description The drive operating system is good. All configured drives are online. The drive operating condition is not optimal because one of the configured drives has failed or is 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. 22 Intel® RAID Module RMS2LL040 and RMS2LL080 Hardware User's Guide