SK0-005 · Question #317
Users have noticed a server is performing below baseline expectations. While diagnosing the server, an administrator discovers disk drive performance has degraded. The administrator checks the…
The correct answer is A. The controller has disabled the write cache. A failed RAID controller battery often leads the controller to disable its write cache to prevent data loss during a power outage, resulting in significant performance degradation.
Question
Users have noticed a server is performing below baseline expectations. While diagnosing the server, an administrator discovers disk drive performance has degraded. The administrator checks the diagnostics on the RAID controller and sees the battery on the controller has gone bad. Which of the following is causing the poor performance on the RAID array?
Options
- AThe controller has disabled the write cache.
- BThe controller cannot use all the available channels.
- CThe drive array is corrupt.
- DThe controller has lost its configuration.
How the community answered
(19 responses)- A89% (17)
- C5% (1)
- D5% (1)
Why each option
A failed RAID controller battery often leads the controller to disable its write cache to prevent data loss during a power outage, resulting in significant performance degradation.
RAID controllers use a battery backup unit (BBU) or similar technology to protect the write cache, ensuring that cached data is not lost during a power failure. When the battery goes bad, the controller disables the write cache as a safety measure, which severely impacts write performance and causes disk degradation.
A faulty battery typically does not directly affect the controller's ability to utilize all available drive channels; this would be a different type of controller hardware failure.
While poor performance can indicate corruption, a failed RAID controller battery specifically causes the controller to disable the write cache, which is a more direct and common cause of performance issues in this scenario.
If the controller lost its configuration, the RAID array would likely be inaccessible or show as foreign, rather than merely performing below baseline expectations.
Concept tested: RAID controller battery impact on performance
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