HP 600 manual Factors to consider before replacing hard drives

Page 31

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.

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Contents HP StorageWorks 600 Modular Disk System User Guide Page Contents Electrostatic discharge Front panel components Component identificationDescription Status Front panel LEDs and buttonGSI LED Rear panel componentsRear panel LEDs and buttons Blue flashing = System is in hard drive Device bay ID numbers SAS and Sata hard drive LEDs SAS and Sata hard drive LED combinations Power up Firmware updateOperations Power down Temperature requirements SetupSpace and airflow requirements Electrical grounding requirements Power requirementsSite planning considerations Installing the enclosureRack warnings Third-party racksSetup SAS and Sata hard drive guidelines Hard drive overviewInstalling the hard drives Remove the hard drive blank Prepare the hard drive Installing the I/O module SAS cabling guidelines Cabling the MDS600Power cords Option ROM Configuration for Arrays Configuration and utilitiesConfiguration tools Array Configuration UtilityManagement tools Diagnostic toolsRemote support and analysis tools Array Diagnostic UtilityHP Insight Remote Support software Change control and proactive notification Keeping the system currentCare Pack When the MDS600 does not power up TroubleshootingLED behavior = System Fan Segment display status codes and actionsRecognizing hard drive failure Compromised fault toleranceEffects of a hard drive failure Factors to consider before replacing hard drives Recovering from compromised fault toleranceTime required for a rebuild Automatic data recovery rebuildFailure of another drive during rebuild FCC rating label Regulatory compliance noticesRegulatory compliance identification numbers Federal Communications Commission noticeClass B equipment European Union regulatory notice ModificationsCables Canadian notice Avis CanadienRegulatory compliance notices Japanese notice Bsmi notice Korean notice Chinese notice Ukraine notice Power cord statement for JapanVietnam compliance marking notice Preventing electrostatic discharge Electrostatic dischargeGrounding methods to prevent electrostatic discharge Environmental specifications SpecificationsStorage array specifications Customer Self Repair Technical supportBefore you contact HP HP contact informationRéparation par le client CSR Riparazione da parte del cliente Reparaciones del propio cliente Reparo feito pelo cliente Technical support Technical support Technical support Acronyms and abbreviations Index LED, UID
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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.

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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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