Server Storage, RAID and Hardware Maintenance
This topic covers storage media, controllers, RAID levels, hot spares, SAN/NAS concepts, cabling, health monitoring, and hardware service procedures.
How to study for CompTIA Server+
Treat each Server+ item as an operations decision: identify the server layer, protect data, read evidence, choose the safe next step, and verify health.
Core concepts
Concept 1
Storage design balances capacity, fault tolerance, throughput, latency, rebuild risk, and budget.
Exam cue: Match RAID level to capacity, fault tolerance, performance, and rebuild risk.
Concept 2
RAID improves availability or performance but does not replace backups.
Exam cue: Separate storage availability from backup and recovery.
Concept 3
Hardware maintenance should preserve data, use known-good parts, observe ESD safety, and verify health after service.
Exam cue: Protect data and verify controller health before hardware service.
Risk pitfalls and guardrails
Treating RAID as a backup.
Guardrail: Avoid answers that treat RAID as backup, replace parts too early, skip restore tests, over-grant access, or close without validation.
Replacing the wrong drive because slots or serials were not verified.
Guardrail: Avoid answers that treat RAID as backup, replace parts too early, skip restore tests, over-grant access, or close without validation.
Ignoring rebuild impact on performance and risk.
Guardrail: Avoid answers that treat RAID as backup, replace parts too early, skip restore tests, over-grant access, or close without validation.
Memory anchors
RAID 0
RAID 0 stripes data for performance but provides no fault tolerance.
RAID 1
RAID 1 mirrors data for simple redundancy with reduced usable capacity.
RAID 5
RAID 5 uses distributed parity and can tolerate one drive failure.
RAID 10
RAID 10 combines mirroring and striping for performance and redundancy.
Hot Spare
A hot spare automatically replaces a failed drive when configured correctly.
HBA
A host bus adapter connects servers to storage devices or storage networks.
SAN
A storage area network provides block storage over dedicated storage networking.
NAS
Network-attached storage provides file-level shared storage over the network.
SMART
SMART data reports drive health indicators that can warn of failure.
ESD Safety
ESD safety reduces the chance of damaging server components during maintenance.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A workload needs maximum sequential throughput and can tolerate complete data loss if one drive fails because source data is reproducible. Which RAID level fits?
A boot-volume mirror uses a pair of 4 TB disks. Ignoring formatting overhead, what capacity can the operating system use?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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