HP 600 manual Automatic data recovery rebuild, Time required for a rebuild

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•Do not remove a second drive from an array until the first failed or missing drive has been replaced and the rebuild process is complete. (The rebuild is complete when the online LED on the front of the drive stops blinking.)

Exceptions:

o In RAID 1+0 configurations, any drives that are not mirrored to other removed or failed drives can be simultaneously replaced offline without data loss.

o In RAID 6 with ADG configurations, any two drives in the array can be replaced simultaneously.

Automatic data recovery (rebuild)

When you replace a hard drive in an array, the controller uses the fault-tolerance information on the remaining drives in the array to reconstruct the missing data (the data that was originally on the replaced drive) and write it to the replacement drive. This process is called automatic data recovery, or rebuild. If fault tolerance is compromised, this data cannot be reconstructed and is likely to be permanently lost.

If another drive in the array fails while fault tolerance is unavailable during rebuild, a fatal system error may occur, and all data on the array is then lost. In exceptional cases, however, failure of another drive need not lead to a fatal system error. These exceptions include:

•Failure after activation of a spare drive

•Failure of a drive that is not mirrored to any other failed drives (in a RAID 1+0 configuration)

•Failure of a second drive in a RAID 6 with ADG configuration

Time required for a rebuild

The time required for a rebuild varies considerably, depending on several factors:

•The priority that the rebuild is given over normal I/O operations (you can change the priority setting by using ACU)

•The amount of I/O activity during the rebuild operation

•The rotational speed of the hard drives

•The availability of drive cache

•The brand, model, and age of the drives

•The amount of unused capacity on the drives

•The number of drives in the array (for RAID 5 and RAID 6 with ADG)

Allow approximately 1 minute per gigabyte for the rebuild process to be completed.

System performance is affected during the rebuild, and the system is unprotected against further drive failure until the rebuild has finished. Therefore, replace drives during periods of low activity when possible.

CAUTION: If the Online LED of the replacement drive stops blinking and the amber Fault LED glows, or if other drive LEDs in the array go out, the replacement drive has failed and is producing unrecoverable disk errors. Remove and replace the failed replacement drive.

When automatic data recovery has finished, the Online LED of the replacement drive stops flashing and begins to glow steadily.

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Contents HP StorageWorks 600 Modular Disk System User Guide Page Contents Electrostatic discharge Component identification Front panel componentsFront panel LEDs and button Description StatusRear panel components GSI LEDRear 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 Operations Firmware updatePower up Power down Space and airflow requirements SetupTemperature requirements Power requirements Electrical grounding requirementsInstalling the enclosure Rack warningsThird-party racks Site planning considerationsSetup Hard drive overview SAS and Sata hard drive guidelinesInstalling the hard drives Remove the hard drive blank Prepare the hard drive Installing the I/O module Cabling the MDS600 SAS cabling guidelinesPower cords Configuration and utilities Configuration toolsArray Configuration Utility Option ROM Configuration for ArraysDiagnostic tools Management toolsHP Insight Remote Support software Array Diagnostic UtilityRemote support and analysis tools Care Pack Keeping the system currentChange control and proactive notification LED behavior TroubleshootingWhen the MDS600 does not power up Segment display status codes and actions = System FanEffects of a hard drive failure Compromised fault toleranceRecognizing hard drive failure Recovering from compromised fault tolerance Factors to consider before replacing hard drivesAutomatic data recovery rebuild Time required for a rebuildFailure of another drive during rebuild Regulatory compliance notices Regulatory compliance identification numbersFederal Communications Commission notice FCC rating labelClass B equipment Modifications CablesCanadian notice Avis Canadien European Union regulatory noticeRegulatory compliance notices Japanese notice Bsmi notice Korean notice Vietnam compliance marking notice Ukraine notice Power cord statement for JapanChinese notice Grounding methods to prevent electrostatic discharge Electrostatic dischargePreventing electrostatic discharge Storage array specifications SpecificationsEnvironmental specifications Technical support Before you contact HPHP contact information Customer Self RepairRéparation 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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