FastTrak TX4650, TX2650 User Manual
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RAID 5 – Block Striping with Distributed Parity
RAID level 5 organizes data across the physical drives of the logical drive, and
distributes parity information across the physical drives along with the data
blocks. This organization allows increased 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.
The adjustable block size of the RAID 5 logical drive allows for performance
tuning based on the typical I/O request sizes for your system. The block size
must be set at the time the logical drive is created and cannot be adjusted
dynamically.
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 FastTrak TX4650 consist of three or four physical
drives.
The FastTrak TX2650 does not support enough physical drives to create a
RAID 5 logical drive.
Data
Blocks
Distributed Parity
Physical Drives
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