Cloud storage types, RAID levels, provisioning, and storage tiering concepts tested on the CompTIA Cloud+ exam.
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- What is object storage?
- Scalable cloud storage accessed via REST API, stores data as objects with metadata, suitable for unstructured data
- What is block storage?
- Storage presented as raw volumes, attached directly to compute instances, provides low-latency access
- What is file storage?
- Network-attached storage accessed via protocols like NFS or SMB/CIFS, supports shared multi-user access
- What is archive storage?
- Long-term, infrequent-access storage for retention and compliance, lowest cost tier, slower retrieval
- What does RAID 0 do?
- Stripes data across multiple disks for increased performance, no redundancy
- What does RAID 1 do?
- Mirrors data across two disks, provides fault tolerance, 50% storage overhead
- What does RAID 5 do?
- Stripes data with parity across three or more disks, tolerates one disk failure, requires minimum three disks
- What does RAID 6 do?
- Stripes data with dual parity across four or more disks, tolerates two simultaneous disk failures
- What is RAID 10?
- Combines mirroring and striping, mirrors pairs of striped disks, higher cost but better performance than RAID 5
- What is thin provisioning?
- Allocating storage space only as needed, improving space efficiency but risking over-subscription
- What is thick provisioning?
- Pre-allocating all required storage space upfront, guaranteeing availability but wasting unused capacity
- What is dynamic provisioning?
- Automatically allocating storage resources based on demand in real-time
- What is over-provisioning?
- Committing more storage capacity than physically available, relies on thin provisioning and assumes not all will be used
- What is storage tiering?
- Automatically moving data between storage tiers based on access patterns and policies to optimize cost and performance
- What characterizes the hot tier?
- Frequently accessed data, typically SSD-based, highest cost per GB, lowest latency
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