Lenovo 4157 User Manual - Page 35
Installing SAS hard disk drives and configuring RAID, Installing SAS hard disk drives
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Installing SAS hard disk drives and configuring RAID This section contains information about the required number of SAS hard disk drives for the supported level of RAID and SAS RAID configuration. Installing SAS hard disk drives Your computer must have the minimum number of SAS hard disk drives installed for the supported level of RAID below: v RAID Level 0 - Striped disk array - Two hard disk drives minimum - Better performance without fault tolerance v RAID Level 1 - Mirrored disk array - Two hard disk drives minimum - Improved read performance and 100% redundancy v RAID Level 5 - Block-level striped disk array with distributed parity - Three hard disk drives minimum - Data striped at the byte level - Stripe error correction information - Better performance and fault tolerance To install a new SAS hard disk drive, refer to the installation procedure in "Replacing a hard disk drive" in the ThinkStation Hardware Installation and Replacement Guide. Entering the Marvell BIOS Setup to configure SAS RAID This section describes how to enter the Marvell BIOS Setup to configure SAS RAID. 1. Your computer must have a Marvell SAS adapter card (Marvell SAS controller) installed to configure SAS RAID. For installing or replacing a Marvell SAS adapter card, refer to "Replacing an adapter card" in the ThinkStation Hardware Installation and Replacement Guide. 2. Turn on the computer after you have installed the required number of SAS hard disk drives and the Marvell SAS adapter card. 3. Press Ctrl+M when prompted to enter the Marvell BIOS Setup to configure SAS RAID. Configuring the Marvell BIOS Setup to enable SAS RAID 0, 1, or 5 functionality To enable SAS RAID 0, 1, or 5 functionality, use the Marvell BIOS Setup configuration utility as the SAS configuration utility. This utility assumes that the system has the required number of hard disk drives. 1. Turn on your computer and press Ctrl+M when prompted to enter the Marvell BIOS Setup. 2. On the Marvell BIOS Setup screen, use the arrow keys to select RAID Config and press Enter. The RAID Config menu opens. 3. From the RAID Config menu, select Create array. 4. Use the arrow keys and the Enter key to select each free hard disk drive that you want to include in the array. 5. Select Next and press Enter. Chapter 6. Installing hard disk drives and configuring RAID 27