HP E200 manual Time required for a rebuild

Page 26

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

•For RAID 5, the number of drives in the array

Allow approximately 15 minutes per gigabyte for the rebuild process to be completed. This figure is conservative, and the actual time required is usually less.

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.

When automatic data recovery has finished, the Online/Activity LED of the replacement drive stops blinking steadily at 1 Hz and begins to either glow steadily (if the drive is inactive) or flash irregularly (if the drive is active).

CAUTION: If the Online/Activity LED on the replacement drive does not light up while the corresponding LEDs on other drives in the array are active, the rebuild process has abnormally terminated. The amber Fault LED of one or more drives might also be illuminated. Refer to "Abnormal termination of a rebuild (on page 26)" to determine what action you must take.

Abnormal termination of a rebuild

If the Online/Activity LED on the replacement drive permanently ceases to be illuminated even while other drives in the array are active, the rebuild process has abnormally terminated. The following table indicates the three possible causes of abnormal termination of a rebuild.

Observation

Cause of rebuild termination

 

 

None of the drives in the array have

One of the drives in the array has

an illuminated amber Fault LED.

experienced an uncorrectable read error.

 

 

The replacement drive has an

The replacement drive has failed.

illuminated amber Fault LED.

 

One of the other drives in the array

The drive with the illuminated Fault LED has

has an illuminated amber Fault LED.

now failed.

 

 

Each of these situations requires a different remedial action.

Case 1: An uncorrectable read error has occurred.

1.Back up as much data as possible from the logical drive.

CAUTION: Do not remove the drive that has the media error. Doing so causes the logical drive to fail.

2.Restore data from backup. Writing data to the location of the unreadable sector often eliminates the error.

3.Remove and reinsert the replacement drive. This action restarts the rebuild process.

If the rebuild process still terminates abnormally:

1.Delete and recreate the logical drive.

Replacing, moving, or adding hard drives 26

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Contents HP Smart Array E200 Controller User Guide Audience assumptions Contents Diagnosing array problems Board components Hardware featuresController specifications Cache on Installing the controller in a previously configured server Overview of the installation procedureInstalling the controller in an unconfigured server Overview of the installation procedure Installing the controller board Installing the controller hardwareBefore beginning the installation Preparing the server Connecting storage devices Updating the firmware Methods for updating the firmwareComparing the utilities Configuring an arrayIntroduction Using Orca Select Create Logical DriveUsing ACU Using CpqonlinExpanding an array Migrating RAID level and stripe size online Setting the controller order Setting the boot controller and controller orderSetting a controller as the boot controller Installing Management Agents Installing device drivers and Management AgentsInstalling device drivers Replacing a battery Upgrading or replacing controller optionsUpgrading the cache Upgrading or replacing controller options Replacing, moving, or adding hard drives Identifying the status of a hard driveRecognizing hard drive failure Terminate the current operation and cause data lossReplacing hard drives Effects of a hard drive failureHard drive replacement guidelines Time required for a rebuild Upgrading hard drive capacity Moving drives and arrays Adding drivesReplacing, moving, or adding hard drives Diagnosing array problems Controller board runtime LEDsBattery pack LEDs LEDDiagnostic tools ADUGrounding methods to prevent electrostatic discharge Electrostatic dischargePreventing electrostatic discharge Bsmi notice Regulatory compliance noticesEuropean Union regulatory notice Korean class B notice Battery replacement notice Taiwan battery recycling noticeAcronyms and abbreviations Index Status lights, battery pack
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