Lenovo Storage N4610, Руководство пользователя и руководство по техническому обслуживанию аппаратного обеспечения

Страница: 58 / 176

7. Connect the storage product to an ac power source. The storage product turns on and then turns
off automatically.
8. Move the jumper cap back to the jumper cap storage. See “System board jumpers” on page 29.
9. Wait for several minutes. When the BIOS recovery process is completed, the storage product turns
on automatically.
10. Ensure that the Setup Utility program starts normally. See “Starting the Setup Utility program” on
page 37. Then, disconnect the storage product from the ac power source.
11. Reinstall any parts and reconnect any cables. Then, reinstall the storage product cover. See
“Completing the parts replacement” on page 135.
12. Connect the storage product to an ac power source and turn on the storage product. Check and
configure the BIOS settings for your specific needs. See “Using the Setup Utility program” on page 37.
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 44
• “Configuring RAID using the Lenovo ThinkServer Deployment Manager program” on page 46
• “Configuring the advanced SATA or SAS hardware RAID” on page 46
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
storage product 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.
RAID drive groups also improve data storage reliability and fault tolerance compared with single-drive
storage systems. Data loss resulting from a drive failure can be prevented by reconstructing missing data
from the remaining drives.
The following list describes some of the most commonly used RAID levels:
• RAID 0 : block-level striping without parity or mirroring
Simple stripe sets are normally referred to as RAID 0. RAID 0 uses striping to provide high data
throughput, especially for large files in an environment that does not require fault tolerance. RAID 0 has no
redundancy and it provides improved performance and additional storage without fault tolerance. Any
drive failure destroys the array and the likelihood of failure increases with more drives in the array. RAID
0 does not implement error checking, so any error is uncorrectable. More drives in the array means
higher bandwidth, but greater risk of data loss.
RAID 0 requires a minimum number of two hard disk drives.
44
Lenovo Storage N4610 User Guide and Hardware Maintenance Manual