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[ARTICLE]

Comparison with the Other Storage Systems

Disk Storage and Tape Storage

Contents

Because of their reduced cost, hard disks (HDD) are now commonly used in a range of fields. It appears as if they have substituted for tape media in backup applications. However, tape storage, which uses magnetic tape, has attracted attention again recently. What advantages does tape storage have compared to disk storage?

Low Total Cost of System

Tape storage has the lowest unit price per volume among all storage media, which is advantageous when building a large-scale system. In addition, since it consumes power only when the backup is being executed, there is no cost to maintain the tape system. As a result, the total cost of ownership (TCO), including the electricity cost and other running costs - the total user cost - can be kept very low.

The figure on the right shows a graph comparing the totals of the hardware cost, the electricity cost and the facility cost required to expand the data capacity of a system between tape systems and disk systems when the storage is expanded by 56 TB annually (by 280 TB for 5 years).

Comparison of Total Hardware Cost

(Source: Fujitsu)

Low Power Consumption

HDDs consume a certain amount of power because they are running and rotating a disk even while idling (as well as while recording/ reproducing). On the other hand, magnetic tape devices rarely require power while idling, and no electricity cost is required for maintaining media either. Tape storage is a highly economical system with low power consumption.

The figure on the right shows a graph comparing the power consumption between tape systems and disk systems when the storage capacities are 50 TB, 140 TB, and 280 TB.

Comparison of Power Consumption
Between Tape Systems and Disk Systems

(Source: Fujitsu)

Low Unit Price per Capacity

Since the unit price per capacity of magnetic tape media is lower than that of HDD, the higher the number of cartridges, the lower the unit price of the entire system will be.

Trends of Unit Prices per Capacity

(Source: JEITA)

Safe Long-term Storage

Reliability is an advantage of magnetic tape systems. Magnetic tape media are optimal for storing data safely for a long time. Magnetic tape systems have low risks of data loss due to blackouts, crashes, or virus attacks, etc., and are an optimal option for BCP.

  • BCP stands for Business Continuity Plan.

Offline/Portability

Tape media, which can store data offline and are portable, are suitable for remote data storage to protect important data from disasters and other risks.

High Reliability

"Troublesome and requires great care." Many of you may have this impression about tape storage. However, present-day tape storage has a lower failure rate and lower risks of data loss due to blackouts, crashes, or virus attacks, etc. than HDD storage. Tape storage is a highly reliable storage system.

Hardware Failure Rate and
its Occurrence Volume by Device

High Transfer Rate

Although magnetic tape systems give the impression that they read data slowly, LTO7 can transfer data at a high speed of 300 MB/second (750 MB/second when the data is compressed), which is more than 20% faster than other storage systems.
On the other hand, since the transfer rate of tape systems does not change during recording verification, they can record twice as fast as other storage systems.

Data Transfer Rate (During Retrieval and Recording Verification)

This chart shows the time required for one drive to read a single file. For tape and optical disk storage systems, it is assumed that they take time to load a medium into the drive and access the desired data. When the data size is small, an HDD system, which is online, can read the data in a very short time because its access speed is high. However, when the data size is approximately 30 GB or more, the transfer speed of a tape system is advantageous, and it can read data faster than a HDD system. These indicate that HDD systems are advantageous for small data sizes, and that tape systems are advantageous for large data sizes. The optical disk system shows inferior performance in both areas.

Data Transfer Times and Data Sizes

Why Is Tape Storage in the Spotlight ?