RAID Failure Indicators for A+
Short answer
Support-level idea: RAID introduces an additional failure layer. Multiple drive failures, controller faults, or corrupted RAID metadata can cause the array to be degraded or disappear. The technician must identify array-level messages and avoid making changes that could worsen recovery chances. Primary actions include documenting messages, preserving configuration where possible, and escalating to RAID administration or vendor support when rebuild/metadata repair is required.
Why it appears on the exam
- Given a scenario with multiple bay LEDs and controller 'array missing' messages, select the correct immediate support action (document and escalate vs. rebuild now). - Distinguish between degraded array (logical volume present) and array missing (logical volume absent) and choose appropriate triage steps.
Key concepts
Concept 1
Required terms
RAID failure: A condition where a RAID volume or its redundancy has been compromised, potentially resulting from multiple drive failures, controller issues, or corrupted RAID metadata. degraded array: A RAID array that has lost redundancy (one or more drives failed or removed) but still presents the logical volume. array missing: A RAID controller or OS condition where the logical RAID volume is no longer presented to the operating system.
Example
A controller utility reports 'degraded' after a single drive failure: identify redundancy lost and plan replacement with rebuild.
Concept 2
How RAID Failure Indicators works
Support-level idea: RAID introduces an additional failure layer. Multiple drive failures, controller faults, or corrupted RAID metadata can cause the array to be degraded or disappear. The technician must identify array-level messages and avoid making changes that could worsen recovery chances. Primary actions include documenting messages, preserving configuration where possible, and escalating to RAID administration or vendor support when rebuild/metadata repair is required.
Example
Multiple bay LEDs and 'array missing' in controller after a power surge: do not reinitialize the controller; escalate and document symptoms.
Concept 3
Common confusion
Technicians may attempt to rebuild or reinitialize arrays without understanding the impact on metadata; such actions can make recovery harder. Another mistake is treating array missing as a single-disk swap-array-level expertise is required.
Example
A controller utility reports 'degraded' after a single drive failure: identify redundancy lost and plan replacement with rebuild.
Concept 4
Core 1 (220-1201) question cues
Given a scenario with multiple bay LEDs and controller 'array missing' messages, select the correct immediate support action (document and escalate vs. rebuild now); Distinguish between degraded array (logical volume present) and array missing (logical volume absent) and choose appropriate triage steps.
Example
Multiple bay LEDs and 'array missing' in controller after a power surge: do not reinitialize the controller; escalate and document symptoms.
Sample questions
Select an answer to reveal the explanation. For tracked practice and weak-area review, use the Cultiv8 app.
Q1.A technician is troubleshooting this situation: A controller utility reports 'degraded' after a single drive failure: identify redundancy lost and plan replacement with rebuild. What should they identify?
Q2.A support ticket includes this clue: Multiple bay LEDs and 'array missing' in controller after a power surge: do not reinitialize the controller; escalate and document symptoms. Which concept is being tested?
Q3.Read this A+ scenario: Multiple bay LEDs and 'array missing' in controller after a power surge: do not reinitialize the controller; escalate and document symptoms. Which term or action matches it?
Practice this lesson in Cultiv8
The app adds tracked practice, targeted remediation, saved session history, and future readiness scoring.
Continue in Cultiv8