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Cheetah 10K.6 FC Product Manual, Rev. B

Sense Key. This is an unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to the Fibre Channel Interface Manual, part number 77767496, for Request Sense informa- tion.

5.2Reliability and service

You can enhance the reliability of Cheetah 10K.6 FC disc drives by ensuring that the drive receives adequate cooling. Section 6.0 provides recommended air-flow information, temperature measurements, and other infor- mation, which you can use to enhance the service life of the drive.

5.2.1Mean time between failure (MTBF)

The production disc drive achieves an MTBF of 1,200,000 hours when operated in an environment that ensures the case temperatures specified in Section 6.3.1 are not exceeded. Short-term excursions up to the specification limits of the operating environment will not affect MTBF performance. Operating the drive at case temperatures above these values will adversely affect the drive’s ability to meet specifications. See Section Fig- ure 12., "Environmental limits".

The MTBF target is specified as device power-on hours (POH) for all drives in service per failure.

The following expression defines MTBF:

MTBF per measurement period = Estimated power-on operating hours in the period

Number of drive failures in the period

Estimated power-on operating hours means power-on hours per disc drive times the total number of disc drives in service. Each disc drive must have accumulated at least nine months of operation. Data is calculated on a rolling average base for a minimum period of six months.

MTBF is based on the following assumptions:

•8,760 power-on hours per year

•250 average on/off cycles per year

•Operating at nominal voltages

•System provides adequate cooling to ensure the case temperatures specified in Section 6.3.1 are not exceeded.

Drive failure means any stoppage or failure to meet defined specifications caused by drive malfunction.

A S.M.A.R.T. predictive failure indicates that the drive is deteriorating to an imminent failure and is considered an MTBF hit.

5.2.2Preventive maintenance

No routine scheduled preventive maintenance is required.

5.2.3Service life

The drive has a useful service life of five 5 years. Depot repair or replacement of major parts is permitted dur- ing the lifetime.

5.2.4Service philosophy

Special equipment is required to repair the drive HDA. To achieve the above service life, repairs must be per- formed only at a properly equipped and staffed Seagate service and repair facility. Troubleshooting and repair of PCBs in the field is not recommended because of the extensive diagnostic equipment required for effective servicing. There are not spare parts available for this drive. The drive warranty is voided if the HDA is opened.

5.2.5Service tools

No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.4. The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not practical because users cannot purchase individual parts for the drive.

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Seagate ST3146807FC manual Reliability and service, Mean time between failure Mtbf, Preventive maintenance, Service life
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ST336607FC, ST373307FC, ST3146807FC specifications

The Seagate ST373307FC, ST3146807FC, and ST336607FC are robust hard disk drives designed for enterprise environments where reliability and performance are critical. Each model offers distinct features suited to various data storage needs, reflecting Seagate's commitment to innovation in storage technology.

The ST373307FC is a 73GB Fibre Channel hard drive that operates at 15,000 RPM, making it exceptionally fast for read and write operations. This drive employs a 4GB cache, enhancing its performance by allowing quicker access to frequently used data. With a 3.5-inch form factor, the ST373307FC is built for high-density environments, delivering reliable access to data. Its Fibre Channel interface supports high-speed connections, essential for data-intensive applications like databases and virtualization.

Next in line, the ST3146807FC offers a capacity of 146GB, also operating at 15,000 RPM. This drive features an 8GB cache, which significantly improves its data transfer rates, making it ideal for transactional workloads. The ST3146807FC is engineered to minimize latency and maximize throughput, ensuring that enterprises can access critical data swiftly and efficiently. Additionally, its rugged construction is designed to withstand the demands of continuous operation, providing peace of mind for businesses with strict uptime requirements.

Lastly, the ST336607FC has a substantial storage capacity of 300GB and shares the 15,000 RPM operational speed that characterizes this high-performance line. With a similar 8GB cache as the ST3146807FC, it offers excellent performance for read-intensive and write-heavy applications. The ST336607FC is also designed with enhanced thermal management features, supporting cooler operations in densely packed server environments. This model is particularly suited for applications such as data warehousing and online transaction processing, where speed and reliability are paramount.

Each of these drives utilizes advanced technologies like Native Command Queuing (NCQ), which optimizes the order of read and write requests. These features, combined with Seagate's reputation for durability and performance, make the ST373307FC, ST3146807FC, and ST336607FC excellent choices for enterprise applications requiring high-speed data access and exceptional reliability. In environments where data integrity and uptime are critical, these drives provide the robust performance necessary to meet demanding storage needs.
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