💿 Disk

🔹 Core Concept
Azure Disk provides persistent, high-performance block storage for Azure Virtual Machines. It ensures that data remains intact even when a VM is stopped or deallocated.

🔹 Purpose
Used to store OS, application, and data files securely with high durability, reliability, and performance. Supports mission-critical workloads, databases, and enterprise applications.

🔹 Disk Types

• Standard HDD: Cost-effective, suitable for dev/test or low IOPS workloads.
• Standard SSD: Balanced performance for general-purpose workloads.
• Premium SSD: High-performance SSD for IO-intensive workloads.
• Ultra Disk: Extreme performance for latency-sensitive, high-throughput applications.

🔹 Integration with Azure Services
Can be attached to Virtual Machines, Virtual Machine Scale Sets, and Availability Sets. Supports snapshots and managed disks for simplified management.

🔹 High Availability & Durability
Data is replicated within an Azure region to ensure resiliency. Disk redundancy can be configured for additional protection.

🔹 Encryption & Security
Supports Azure Disk Encryption (ADE) and customer-managed keys for compliance and security.

🔹 Performance & Monitoring
Monitor disk performance with Azure Monitor and Metrics, including IOPS, latency, and throughput.

🔹 Architecture Design

• Managed vs Unmanaged Disks: Managed disks simplify storage management and scaling.
• VM Integration: Attach disks to VMs or scale sets for OS and data storage.
• Availability Integration: Use with Availability Sets or Availability Zones for high uptime.
• Snapshots & Backups: Integrate with Azure Backup and Recovery Services Vault for disaster recovery.
• Performance Planning: Choose disk type based on workload IOPS and throughput requirements.

🔹 End-to-End Implementation

• Plan Disk Requirements: Identify disk type, size, and performance needs.
• Create Disk: Use Azure Portal, CLI, PowerShell, or ARM templates.
• Attach to VM: Associate the disk with an existing or new VM.
• Configure Encryption: Enable Azure Disk Encryption if required.
• Monitor Performance: Track IOPS, latency, and throughput metrics.
• Enable Snapshots/Backups: Configure snapshots or integrate with Azure Backup for DR.
• Scale Storage: Resize or add disks as needed based on workload growth.

🔹 Real-World Use Cases

• Operating System Disks: Persistent storage for VM OS.
• Application Disks: Store databases, web applications, or ERP systems.
• High-Performance Workloads: Use Premium or Ultra Disks for SQL, SAP HANA, or analytics workloads.
• Backup & Disaster Recovery: Snapshots for point-in-time recovery and backup.