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Replacing, moving, or adding hard drives 22
• 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/Activity LED on the
front of the drive stops blinking.)
The following cases are exceptions:
o In RAID 6 (ADG) configurations, any two drives in the array can be replaced simultaneously.
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.
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
can 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 (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
• For RAID 5 and RAID 6 (ADG), the number of drives in the array
Allow approximately 15 minutes per gigabyte for the rebuild process to be completed. This figure is
conservative; the actual time required is usually less than this.
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).
- User Guide 1
- Audience assumptions 2
- Contents 3
- Contents 4 4
- Hardware features 5
- Preparing the server blade 9
- Updating the firmware 10
- Configuring an array 11
- Setting the controller order 12
- Installing device drivers 14
- Installing Management Agents 14
- Replacing the battery 15
- 18
- Compromised fault tolerance 20
- Replacing hard drives 21
- Time required for a rebuild 22
- Moving drives and arrays 24
- Adding drives 25
- Diagnosing array problems 27
- Battery pack LEDs 28
- Diagnostic tools 29
- • HP Insight Diagnostics 30
- Electrostatic discharge 31
- BSMI notice 32
- Korean class A notice 33
- Battery replacement notice 33
- Acronyms and abbreviations 34
- Index 35 35
- Index 36 36
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ScreenPRO II
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INPUT MENU
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Input Type
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OUTPUT MENU
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TEST PATTERN
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SYSTEM MENU
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8Data Bits
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NONEParity
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1Stop Bits
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System Menu
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EFFECTS MENU
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Status Menu
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Contrast 97
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ADJUSTMENT
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Key Menu
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Green 204
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DSK ADJUSTMENT
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Important
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