Lenovo ThinkServer RD330 MegaRAID SAS Software User Guide - Page 16
Dimmer Switch Feature, UEFI 2.0 Support, Configuration Scenarios
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Chapter 1: Overview | Dimmer Switch Feature MegaRAID SAS Software User Guide CacheCade - SSD Caching software Guard works by looking for a predictive failure while monitoring the SDD Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.) error log. If errors indicate a CacheCade - SSD Caching software failure is imminent, MegaRAID starts a rebuild to preserve the data on the CacheCade - SSD Caching software and sends appropriate warning event notifications. 1.5 Dimmer Switch Feature Powering and cooling drives represents a major cost for data centers. The new MegaRAID Dimmer Switch reduces the power consumption of the devices connected to a MegaRAID controller. This helps to share resources more efficiently and lower costs. With Dimmer Switch, any unconfigured drive connected to a MegaRAID controller is spun down after 30 minutes of inactivity, reducing its power usage. Spun down drives are spun up automatically when you create a configuration using those drives. 1.6 UEFI 2.0 Support Significant challenges face operating system and platform developers to innovate using the legacy PC-AT BIOS boot environment. These include memory constraints, maintenance challenges, and increased complexities due to a lack of industry-wide standards. To handle these challenges, the Unified Extensible Firmware Interface (UEFI) was developed to do the following: Define a clean interface between operating systems and the hardware platform at boot time. Support an architecture-independent mechanism for initializing add-in cards. UEFI 2.0 provides MegaRAID customers with expanded platform support. The MegaRAID UEFI 2.0 driver, a boot service device driver, handles block IO requests and SCSI pass-through commands (SPT), and offers the ability to launch pre-boot MegaRAID management applications through a driver configuration protocol (DCP). The UEFI driver also supports driver diagnostic protocol, which allows administrators to access pre-boot diagnostics. 1.7 Configuration Scenarios There are three main scenarios in which you can use the SAS RAID controllers: Low-end, internal SATA II configurations: In this configuration, use the RAID controller as a high-end SATA II compatible controller that connects up to eight disks either directly or through a port expander. This configuration is mostly for low-end or entry servers. Enclosure management is provided through out-of-band I2C bus. Side bands of both types of internal SAS connectors support the SFF-8485 (SGPIO) interface. Midrange internal SAS configurations: This configuration is like the internal SATA II configurations, but with high-end disks. This configuration is more suitable for low-range to midrange servers. High-end external SAS/SATA II configurations: This configuration is for both internal connectivity and external connectivity, using SATA II drives, SAS drives, or both. External enclosure management is supported through in-band, SCSI-enclosed storage. The configuration must support STP and SMP. Page 16