RAID Configurations: RAID 5

RAID 5
A RAID 5 requires a minimum of 3 drives to configure. A RAID 5 is the most common and versatile RAID array design, and is used for databases, email servers, file servers, and critical application servers. A RAID 5 is a striped array with segments consisting of RAID 5 arrays and has the highest data reading speed of RAID models.

Each entire data block of a RAID 5 is written on a data disk, parity for blocks in the same rank is generated on writes, recorded in a distributed location, and then checked on reads.

In some installations, a RAID 5 array can recover from multiple and simultaneous hard drive failures.

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Did You Know?

Formatting a boot drive or partition can also damage or remove striping, which reduces the recoverability of data and causes permanent loss.

Common Causes for
RAID Failures

• Adding incompatible hard drives to the RAID array.
• Hardware conflicts with the hard drive and RAID server.
• Software corruption to the operating system.
• A virus infection, software or operating system upgrade.
• RAID controller failure or configuration change.
• Two or more hard drives fail or go offline.
• Server crashes and won't remount the array or volume(s).
• Configuration becomes corrupt or damaged.

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