Asus RS724QA-E6 RS12 User Guide - Page 18

controller can have one or two global hot spare disks available to automatically replace a failed disk in the IM or IME storage volumes on the controller. Hot spares make the IM/IME volume even more faulttolerant. Note: You can also configure one IM or IME volume and one Integrated Striping (IS) volume on the same LSI SAS controller. The IM/IME feature uses the same device drivers as the standard LSI Fusion-MPT based controllers, providing seamless and transparent fault tolerance. This eliminates the need for complex backup software or expensive RAID hardware. The IM/IME feature operates independently from the operating system, in order to conserve system resources. The BIOS-based configuration utility makes it easy to configure IM and IME volumes. 2.2 IM and IME Features IM and IME support the following features: • Configurations of one or two IM or IME volumes on the same LSI SAS controller. IM volumes have two mirrored disks; IME volumes have three to ten mirrored disks. Two volumes can have up to 12 disks total. (Requires Integrated RAID firmware v1.20.00 or above.) • One or two global hot spare disks per controller, to automatically replace failed disks in IM/IME volumes. (Support for two hot spares requires Integrated RAID firmware v1.20.00 or above.) The hot spares are in addition to the 12-disk maximum for two volumes per SAS controller. • Mirrored volumes run in optimal mode or in degraded mode (if one mirrored disk fails). • Hot swap capability. • Presents a single virtual drive to the OS for each IM/IME volume. • Supports both SAS and SATA disks. The two types of disks cannot be combined in the same volume. However, an LSI SAS controller can support one volume with SATA disks and a second volume with SAS disks. 2-2 Overview of Integrated Mirroring and Integrated Mirroring Enhanced Version 1.1 Copyright © 2006, 2007 by LSI Logic Corporation. All rights reserved.