AZ-305 · Question #112
Hotspot Question You have an on-premises file server that stores 2 TB of data files. You plan to move the data files to Azure Blob Storage In the West Europe Azure region. You need to recommend a…
Azure Storage Account - Hotspot Answer Correct Answers 1. Storage Account Type: Standard general-purpose v2 2. Redundancy: Zone-redundant storage (ZRS) --- Dropdown 1: Storage Account Type Correct: Standard general-purpose v2 GPv2 is the recommended account type for Blob…
Question
Exhibits
Answer Area
- Storage Account type:Premium block blobsStandard general-purpose v1Standard general-purpose v2
- Redundancy:Geo-redundant storage (GRS)Zone-redundant storage (ZRS)Locally-redundant storage (LRS)Read-access geo-redundant storage (RA-GRS)
Explanation
Azure Storage Account - Hotspot Answer
Correct Answers
- Storage Account Type: Standard general-purpose v2
- Redundancy: Zone-redundant storage (ZRS)
Dropdown 1: Storage Account Type
Correct: Standard general-purpose v2
GPv2 is the recommended account type for Blob Storage because it:
- Supports all storage tiers: Hot, Cool, and Archive - directly satisfying the "support storage tiers" requirement
- Uses HDD-based (standard) storage, keeping costs low
- Supports all modern Azure Storage features (Blob, Files, Queues, Tables)
Why the others are wrong:
| Option | Why Wrong |
|---|---|
| Premium block blobs | Uses SSD storage - significantly higher cost. Does not support storage tiers (Hot/Cool/Archive). Eliminates two requirements. |
| Standard general-purpose v1 | Legacy account type. Does not support storage tiers. Fewer features, no lifecycle management. |
Key concept: Storage tiers (Hot/Cool/Archive) are only supported on GPv2 and Blob storage account types among the standard tier offerings.
Dropdown 2: Redundancy
Correct: Zone-redundant storage (ZRS)
ZRS replicates data synchronously across 3 availability zones within the same Azure region (West Europe). Each availability zone is a physically separate datacenter. Therefore:
- If one datacenter fails, data remains accessible from the other two zones - satisfying the availability requirement
- It stays within one region, making it cheaper than geo-redundant options
Why the others are wrong:
| Option | Why Wrong |
|---|---|
| LRS | Replicates 3 copies within a single datacenter only. A datacenter failure = potential outage. Fails the availability requirement. |
| GRS | Replicates to a secondary region asynchronously. Survives datacenter failure, but costs ~2Ã- ZRS. Fails the minimize cost requirement. |
| RA-GRS | Same as GRS + read access to secondary region. Most expensive option. Overkill for this scenario. |
Key concept: The phrase "single datacenter fails" maps directly to availability zone failure, which ZRS is specifically designed to handle - within one region, at the lowest redundancy cost that meets this bar.
Summary
| Requirement | Solution |
|---|---|
| Survive single datacenter failure | ZRS (3 zones) |
| Support storage tiers | Standard GPv2 |
| Minimize cost | ZRS over GRS/RA-GRS; Standard over Premium |
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