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Understanding RAID Concepts and Levels

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read performance is twice the speed of a single drive during sequential read

operation.

The adaptive algorithms in TwinStor technology boost performance by

distinguishing between random and sequential read requests. For the

sequential requests generated when accessing large files, both drives are used,

with the heads simultaneously reading alternating sections of the file. For the

smaller random transactions, the data is read from a single optimal drive head.

Figure 3. RAID 1 Configuration Example

RAID 5

RAID 5 provides performance, fault tolerance, high capacity, and storage

efficiency. It requires a minimum of three drives and combines striping data

with parity (exclusive OR) to restore data in case of a drive failure.

Performance and efficiency increase as the number of drives in a unit

increases.

Parity information is distributed across all of the drives in a unit rather than

being concentrated on a single disk (see Figure 4). This avoids throughput

loss due to contention for the parity drive.

RAID 5 is able to tolerate 1 drive failure in the unit.

Figure 4. RAID 5 Configuration Example

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