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Chapter 5. RAID
What is RAID
Redundant Array of Independent Disks (RAID) is a technology that provides increased storage functions and
reliability through redundancy. It also can 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.
When a group of independent physical storage drives is set up to use RAID technology, they are in a RAID
array. This array distributes data across multiple storage drives, but the array appears to the host computer
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.
Configure RAID with AVAGO MegaRAID Configuration Utility
To configure RAID with AVAGO MegaRAID Configuration Utility, ensure that:
• An AVAGO MegaRAID adapter is installed in your computer.
• The storage drives used for RAID configuration are connected to the installed AVAGO MegaRAID adapter
instead of the system board.
Storage drive requirements for RAID levels
Your computer supports the following RAID levels:
• RAID 0: striped disk array
– Consists of at least two NVMe storage drives
– Supported strip size: 64 KB, 128 KB, 256 KB, 512 KB, or 1 MB
– Better performance without fault tolerance
• RAID 1: mirrored disk array
– Consists of two or four NVMe storage drives
– Improved read performance and 100% redundancy
• RAID 10: striped and mirrored disk array (a combination of RAID 0 and RAID 1)
– Consists of four NVMe storage drives
– Data being striped across storage drive groups
– Provides both high data transfer rates and complete data redundancy
• RAID 5: block-level striped disk array with distributed parity
– Consists of at least three NVMe storage drives
– Supported strip size: 64 KB, 128 KB, 256 KB, 512 KB, or 1 MB
– Better performance and fault tolerance
– Available only on selected models of AVAGO MegaRAID adapters
• RAID 6: block-level striped disk array with dual distributed parity
– Consists of at least four NVMe storage drives
– Supported strip size: 64 KB, 128 KB, 256 KB, 512 KB, or 1 MB
– Better performance and fault tolerance that can stand up to loss of two storage drives
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