CAUTION: When fault tolerance is compromised, data loss can occur. However, it may be possible to recover the data. For more information, see "Recovering from compromised fault tolerance (on page 31)."

If more drives fail than the fault-tolerance method can manage, fault tolerance is compromised, and the logical drive fails. If this failure occurs, the operating system rejects all requests and indicates unrecoverable errors.

For example, fault tolerance might occur when a drive in an array fails while another drive in the array is being rebuilt.

Compromised fault tolerance can also be caused by problems unrelated to drives. In such cases, replacing the physical drives is not required.

Recovering from compromised fault tolerance

If fault tolerance is compromised, inserting replacement drives does not improve the condition of the logical volume. Perform the following procedure to recover data:

1.Check for loose, dirty, broken, or bent cabling and connectors on all devices.

2.Power down the MDS600 ("Power down" on page 13).

3.Power up the MDS600 ("Power up" on page 12).

In some cases, a marginal drive is operational long enough to allow backup of important files.

4.Make copies of important data, if possible.

5.Replace any failed drives ("Installing the hard drives" on page 19).

Factors to consider before replacing hard drives

You can replace hard drives without powering down the system. However, before replacing a degraded drive:

•Open HP SIM and inspect the Error Counter window for each physical drive in the same array to confirm that no other drives have any errors. (For details, refer to the HP SIM documentation on the Management CD.)

•Be sure that the array has a current, valid backup.

•Use replacement drives that have a capacity at least as great as that of the smallest drive in the array. The controller immediately fails drives that have insufficient capacity.

To minimize the likelihood of fatal system errors when removing failed drives, take the following precautions:

•Do not remove a degraded drive if any other drive in the array is offline (the online LED is off). In this situation, removing any other drive in the array causes data loss.

Exceptions:

o When RAID 1+0 is used, drives are mirrored in pairs. Several drives can be in a failed condition simultaneously (and they can all be replaced simultaneously) without data loss, if no two failed drives belong to the same mirrored pair.

o When RAID 6 with ADG is used, two drives can fail simultaneously (and be replaced simultaneously) without data loss.

o If the offline drive is a spare, the degraded drive can be replaced.

Troubleshooting 31

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HP 600 manual Factors to consider before replacing hard drives, Recovering from compromised fault tolerance
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600 specifications

The HP 600 series is an impressive line of powerful and versatile computing solutions, designed to meet the needs of businesses and professionals across various industries. Known for its robust performance and reliable functionality, the HP 600 series is an ideal choice for those seeking efficiency and durability in a compact form.

One of the hallmark features of the HP 600 series is its advanced processing capabilities. Equipped with the latest Intel processors, such as the Intel Core i5 or i7, the series delivers exceptional speed and responsiveness, allowing users to seamlessly juggle multiple applications and tasks. This makes it an excellent option for professionals who rely on software-heavy workflows, such as graphic design, data analysis, and content creation.

The HP 600 series also emphasizes security, a critical factor for businesses concerned about data protection and privacy. With features like HP Sure Start, which automatically detects and mitigates firmware attacks, and HP BIOSphere, ensuring automatic updates to the system’s firmware, the HP 600 series provides strong layers of defense against potential threats. Furthermore, optional Intel vPro technology enhances remote management, making it easier for IT teams to monitor and support devices.

In terms of display quality, the HP 600 series boasts high-definition screens that deliver vibrant visuals and crisp details. This is especially beneficial for design professionals who need accurate color representation. The touch-enabled options available in the series add a layer of interactivity, making it easier to engage with applications and presentations, promoting productivity.

Connectivity is another area where the HP 600 shines. With multiple USB ports, HDMI outputs, and an Ethernet port, users can easily connect to various devices and networks, enhancing collaboration and communication. The inclusion of Wi-Fi 6 technology ensures that users enjoy faster internet speeds and a more reliable connection, essential for today’s fast-paced work environments.

In terms of design, the HP 600 series features a sleek, professional aesthetic that fits well in any office setting. Its durable build quality ensures longevity, standing up to the demands of daily use while maintaining an appealing look.

Overall, the HP 600 series is a well-rounded solution that combines powerful performance, security, and connectivity, making it an ideal choice for professionals and businesses looking to enhance their productivity and efficiency in a highly competitive market. Whether for everyday tasks or more demanding applications, the HP 600 series is poised to deliver exceptional results.
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