ATI Xpert 98 User Manual - Page 103

RAID 5 - Block Striping with Distributed Parity, Distributed Parity

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Chapter 6: Technology Background RAID 5 - Block Striping with Distributed Parity RAID 5 stripes data and distributes parity information across the physical drives along with the data blocks. This organization increases performance by accessing multiple physical drives simultaneously for each operation, as well as fault tolerance by providing parity data. In the event of a physical drive failure, data can be re-calculated by the RAID system based on the remaining data and the parity information. RAID 5 makes efficient use of hard drives and is the most versatile RAID Level. It works well for file, database, application and web servers. Figure 3. RAID 5 Stripes all drives with data and parity information Distributed Parity Data Blocks physical drives The capacity of a RAID 5 logical drive is the smallest physical drive size multiplied by the number of physical drives, less one. Hence, a RAID 5 logical drive with four 100 GB physical drives will have a capacity of 300 GB. A logical drive with two 120 GB physical drives and one 100 GB physical drive will have a capacity of 200 GB. RAID 5 logical drives on the AMD Chipset SATA Controller consist of 3 or 6 physical drives. 97

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Chapter 6: Technology Background
97
RAID 5 – Block Striping with Distributed Parity
RAID 5 stripes data and distributes parity information across the physical drives
along with the data blocks. This organization increases performance by
accessing multiple physical drives simultaneously for each operation, as well as
fault tolerance by providing parity data. In the event of a physical drive failure,
data can be re-calculated by the RAID system based on the remaining data and
the parity information.
RAID 5 makes efficient use of hard drives and is the most versatile RAID Level. It
works well for file, database, application and web servers.
Figure 3.
RAID 5 Stripes all drives with data and parity information
The capacity of a RAID 5 logical drive is the smallest physical drive size
multiplied by the number of physical drives, less one. Hence, a RAID 5 logical
drive with four 100 GB physical drives will have a capacity of 300 GB. A logical
drive with two 120 GB physical drives and one 100 GB physical drive will have a
capacity of 200 GB.
RAID 5 logical drives on the AMD Chipset SATA Controller consist of 3 or 6
physical drives.
Data
Blocks
Distributed Parity
physical drives