Este módulo transforma as questões em uma revisão orientada de fundamentos de storage em cenários práticos. Antes de responder, identifique o requisito principal do cenário, diferencie o modelo de acesso aos dados e elimine alternativas que resolvem outro problema técnico.
Questões neste módulo
10 questões ou exercícios, com correção e explicações mantidas no próprio simulado.
Como estudar
Responda sem consultar o gabarito. Depois, revise a justificativa e registre o conceito que levou à resposta correta.
Objetivo
Compreender o motivo técnico de cada escolha, em vez de apenas memorizar letras ou frases.
O que você revisará
SAN, NAS e DAS
Block, file e object storage
Flash, latência e IOPS
Thin provisioning e redução de dados
Escolha da arquitetura por workload
Estratégia para questões de cenário
Procure palavras que indiquem acesso em bloco, arquivo ou objeto; necessidade de baixa latência, grande throughput, compartilhamento, retenção, disponibilidade ou recuperação. Em seguida, escolha a tecnologia que atende diretamente ao requisito, sem adicionar complexidade desnecessária.
Material independente: conteúdo organizado por Jociano Baum para estudo e revisão. Não é material oficial de prova e não representa garantia de aprovação. As situações são educacionais e genéricas, sem referência a empresas ou ambientes reais.
Observações de autoria — Jociano Baum:
conteúdo organizado e complementado com base em materiais de estudo e revisão para Data Storage Associate (DSA).
Material destinado ao estudo independente e não apresentado como conteúdo oficial de certificação.
jociano.com.br
Pure Storage DSA Premium Bank v2
Volume 1 - Storage Fundamentals - Block 3
Q21 • Difficulty: ★★★ • Blueprint: Storage Fundamentals • Concepts: SAN vs NAS vs DAS
A branch office needs low-cost storage for a single local application server. The data does not need to be shared with other hosts, and the business wants the simplest deployment possible. Which storage architecture BEST fits this requirement?
A) Storage Area Network (SAN)
B) Direct Attached Storage (DAS)
C) Network Attached Storage (NAS)
D) Object Storage
✅ Correct: B) Direct Attached Storage (DAS)
Why? DAS is simple and cost-effective when storage is needed by only one server and sharing is not required.
Why not A? SAN is better for shared block storage across multiple hosts, but adds cost and complexity.
Why not C? NAS is useful for shared file access, which is not required here.
Why not D? Object storage is not the best fit for a single local application server needing simple local storage.
Exam Tip: Single server + simple/low cost + no sharing = DAS.
A customer has three workloads: a SQL database, shared departmental folders, and an archive of image files accessed through an application API. Which mapping is MOST appropriate?
A) SQL on object storage, folders on block, images on file
B) SQL on block, folders on file, images on object
C) SQL on file, folders on object, images on block
D) SQL on DAS only, folders on SAN only, images on local NVMe only
✅ Correct: B) SQL on block, folders on file, images on object
Why? Databases commonly use block storage, shared folders use file storage, and API-accessed unstructured images fit object storage.
Why not A? It mismatches all three common access patterns.
Why not C? It incorrectly places the database on file and images on block.
Why not D? It overconstrains the design and ignores the appropriate access model.
An online payment system performs thousands of small random reads and writes per second. The application team complains that users notice delays during transactions. Which performance metric should be prioritized first?
A) Latency
B) Raw capacity
C) Backup retention
D) Object metadata count
✅ Correct: A) Latency
Why? Transactional applications are sensitive to delay. Low latency is critical for user-facing transaction response time.
Why not B? Capacity does not directly explain transaction response delay.
Why not C? Backup retention affects recoverability, not real-time transaction latency.
Why not D? Object metadata is unrelated to this block-style transaction workload.
Exam Tip: User-visible delay in transactions = latency.
A database administrator says the workload is not moving large files, but it performs many small random operations every second. Which storage metric BEST describes this workload demand?
A) Throughput
B) IOPS
C) RPO
D) Compression ratio
✅ Correct: B) IOPS
Why? IOPS measures input/output operations per second, which is important for workloads with many small random operations.
Why not A? Throughput is more relevant to large sequential transfers.
Why not C? RPO is a disaster recovery objective.
Why not D? Compression ratio measures data reduction, not operation rate.
A manager says that because the storage system uses RAID, the company no longer needs backups. Which response is MOST accurate?
A) Correct; RAID replaces backup because it protects data from all failures
B) Incorrect; RAID improves availability against hardware failure but does not replace recoverable backup copies
C) Correct; RAID protects against ransomware and accidental deletion
D) Incorrect; RAID is only used for object metadata
✅ Correct: B) RAID improves availability against hardware failure but does not replace recoverable backup copies
Why? RAID protects against certain hardware failures, but backups protect against deletion, corruption, ransomware, and site-level recovery scenarios.
Why not A? RAID does not protect against every failure or data loss scenario.
Why not C? RAID does not prevent ransomware encryption or accidental deletion.
Why not D? RAID is a data protection scheme, not object metadata.
Exam Tip: RAID is not backup. This is a classic certification trap.
A distributed storage system must tolerate failures while using less capacity overhead than simple full mirroring. Which data protection method is MOST aligned with this design goal?
A) Erasure Coding
B) Full Provisioning
C) Local DAS
D) SMB Signing
✅ Correct: A) Erasure Coding
Why? Erasure coding provides fault tolerance with better capacity efficiency than full copies or simple mirroring in many distributed designs.
Why not B? Full provisioning concerns capacity allocation, not failure tolerance.
Why not C? DAS is an attachment model, not a protection scheme.
Why not D? SMB signing is a security feature, not storage data protection.
Exam Tip: Capacity-efficient fault tolerance at scale = Erasure Coding.
A company has repeatedly expanded a single storage system by adding shelves and upgrading controllers. The architect now warns that the platform will eventually reach a maximum supported limit. Which architectural concern is being described?
A) Scale-out node expansion
B) Scale-up architecture limit
C) Object metadata growth
D) File protocol authentication
✅ Correct: B) Scale-up architecture limit
Why? Scale-up architectures grow within a single system, but eventually reach controller, shelf, or platform limits.
Why not A? Scale-out expands by adding nodes horizontally.
Why not C? Metadata growth is not the key issue in this scenario.
Why not D? Authentication is unrelated to physical platform scaling.
Exam Tip: Bigger single system = scale-up. More nodes = scale-out.
A storage system is designed so that one controller handles I/O during normal operation, while the other controller waits to take over if the active controller fails. Which architecture does this describe?
A) Active-active
B) Active-passive
C) Scale-out object storage
D) Erasure coding
✅ Correct: B) Active-passive
Why? Active-passive designs use one active component and one standby component for failover.
Why not A? Active-active means multiple controllers actively process I/O.
Why not C? Scale-out refers to adding nodes, not active/standby controller behavior.
Why not D? Erasure coding is a data protection technique.
Exam Tip: One active + one standby = active-passive.
A customer wants to use the fastest storage tier for temporary analytics scratch space. The data can be recreated, but the workload is extremely sensitive to latency. Which storage characteristic matters MOST?
A) Lowest possible latency
B) Long-term tape retention
C) Maximum object metadata
D) Highest backup frequency
✅ Correct: A) Lowest possible latency
Why? Scratch analytics that can be recreated but is latency-sensitive should prioritize fast access, making low latency the key requirement.
Why not B? Tape retention is for long-term durability, not low-latency scratch workloads.
Why not C? Metadata is associated with object storage, not the core requirement here.
Why not D? Backup frequency matters less because the data can be recreated.
Exam Tip: Always identify the dominant requirement: latency, capacity, durability, or recoverability.
An administrator reports a 5:1 storage efficiency ratio after enabling data reduction technologies. What does this ratio generally indicate?
A) The array has five controllers for every host
B) The effective logical data stored is about five times the physical capacity consumed
C) The network is five times faster than before
D) The RPO is reduced by five hours
✅ Correct: B) The effective logical data stored is about five times the physical capacity consumed
Why? Storage efficiency ratios compare effective/logical data stored to physical capacity consumed after reduction technologies.
Why not A? Controller count is unrelated to data reduction ratio.
Why not C? Network speed is not measured by storage efficiency.
Why not D? RPO is a recovery objective, not a storage efficiency metric.
Exam Tip: Efficiency ratio = logical/effective data compared to physical consumed capacity.
Ao concluir este bloco, revise os conceitos abaixo e retorne às questões em que houve dúvida. Uma resposta correta por eliminação só se transforma em aprendizado quando você consegue explicar o requisito e a tecnologia escolhida.
SAN, NAS e DASBlock, file e object storageFlash, latência e IOPSThin provisioning e redução de dadosEscolha da arquitetura por workload
Erro comum
Escolher a tecnologia mais avançada, mesmo quando o cenário pede simplicidade, custo menor ou apenas um tipo específico de acesso.
Próximo passo
Compare este módulo com outro domínio do DSA e observe como storage, rede, proteção, virtualização e cloud se relacionam.
Perguntas frequentes
Como revisar fundamentos de storage em cenários práticos?
Refaça as questões erradas, escreva em uma frase o requisito principal de cada cenário e compare as alternativas pelo modelo de acesso, desempenho, disponibilidade ou proteção exigidos.
É suficiente memorizar o gabarito?
Não. A utilidade do simulado está em entender por que uma alternativa atende ao cenário e por que as demais resolvem problemas diferentes.
Este conteúdo é oficial?
Não. É um material independente de estudo, criado para revisão conceitual e prática.