Lenovo ThinkServer RD550 - Manual (Page 70)

3. Check and configure the BIOS settings for your specific needs. See “Using the Setup Utility
program” on page 49.
• Using the BIOS recovery jumper
1. Remove all media from the drives and turn off all attached devices and the server. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the server.
2. Prepare your server. See “Removing or extending the server from the rack cabinet” on page 63.
3. Remove the server cover. See “Removing the server cover” on page 63.
4. Locate the BIOS recovery jumper on the system board. See “System board jumpers” on page 41.
Then, remove any parts and disconnect any cables that might impede your access to the jumper.
5. Remove the jumper cap from the jumper cap storage. See “System board jumpers” on page 41.
6. Note the orientation of the jumper cap and then install the jumper cap on the BIOS recovery jumper.
7. Connect the server to an ac power source. The server turns on and then turns off automatically.
8. Move the jumper cap back to the jumper cap storage. See “System board jumpers” on page 41.
9. Wait for several minutes. When the BIOS recovery process is completed, the server turns on
automatically.
10. Ensure that the Setup Utility program starts normally. See “Starting the Setup Utility program” on
page 49. Then, disconnect the server from the ac power source.
11. Reinstall any parts and reconnect any cables. Then, reinstall the server cover. See “Completing
the parts replacement” on page 144.
12. Connect the server to an ac power source and turn on the server. The BIOS settings recover to
the factory-default settings. Check and configure the BIOS settings for your specific needs. See
“Using the Setup Utility program” on page 49.
Note: If you cannot recover the BIOS after using the instructions in this topic, the BIOS read-only memory
(ROM) might be damaged. You must replace the system board. Contact the Lenovo Customer Support
Center.
Configuring RAID
This topic provides information about RAID and the utility programs that are available for you to configure
RAID.
This topic contains the following information:
• “About RAID” on page 56
• “Configuring RAID using the Lenovo ThinkServer Deployment Manager program” on page 58
• “Configuring the advanced SATA or SAS hardware RAID” on page 58
About RAID
RAID, an acronym for Redundant Array of Independent Disks, is a technology that provides increased
storage functions and reliability through redundancy. This is achieved by combining multiple hard disk drives
into a logical unit, where data is distributed across the drives in one of several ways called RAID levels.
When a group of independent physical hard disk drives are set up to use RAID technology, they are in a
RAID array. This array distributes data across multiple hard disk drives, but the array appears to the host
server as one single storage unit. Creating and using RAID arrays provides high performance, such as the
expedited I/O performance, because several drives can be accessed simultaneously.
56 ThinkServer RD550 User Guide and Hardware Maintenance Manual