Storage

<h3>Amazon S3 (Simple Storage Service)</h3> <p><strong>Definition:</strong> Object storage service with industry-leading scalability, data availability, security, and performance.</p> <p><strong>Storage Classes:</strong></p> <ul> <li><strong>S3 Standard:</strong> Frequently accessed data.</li> <li><strong>S3 Intelligent-Tiering:</strong> Unknown/changing access patterns.</li> <li><strong>S3 Standard-IA:</strong> Infrequently accessed.</li> <li><strong>S3 One Zone-IA:</strong> Infrequently accessed, single AZ.</li> <li><strong>S3 Glacier:</strong> Archive storage (minutes retrieval).</li> <li><strong>S3 Glacier Deep Archive:</strong> Lowest cost (hours retrieval).</li> </ul> <p><strong>Features:</strong> Versioning, Encryption, Lifecycle policies, Cross-region replication, Presigned URLs, Static website hosting.</p>

<h3>Amazon EBS (Elastic Block Store)</h3> <p><strong>Definition:</strong> Persistent block storage volumes for EC2 instances.</p> <p><strong>Volume Types:</strong></p> <ul> <li><strong>SSD (gp2/gp3):</strong> General purpose.</li> <li><strong>SSD (io1/io2):</strong> Provisioned IOPS (performance).</li> <li><strong>HDD (st1):</strong> Throughput optimized.</li> <li><strong>HDD (sc1):</strong> Cold HDD (lowest cost).</li> </ul> <p><strong>Features:</strong> Snapshots, encryption, multi-attach (io1/io2).</p>

<h3>Amazon EFS (Elastic File System)</h3> <p><strong>Definition:</strong> Serverless, scalable file storage for Linux.</p> <p><strong>Performance Modes:</strong></p> <ul> <li><strong>General Purpose:</strong> Default for web servers, CMS.</li> <li><strong>Max I/O:</strong> Higher throughput, higher latency.</li> </ul> <p><strong>Throughput Modes:</strong> Bursting (based on size), Provisioned (set throughput independent of size).</p> <p><strong>Use Cases:</strong> Content management, web serving, data sharing.</p>

<h3>Amazon S3 Glacier</h3> <p><strong>Definition:</strong> Secure, durable, low-cost storage for archiving.</p> <p><strong>Retrieval Options:</strong></p> <ul> <li><strong>Expedited:</strong> 1-5 minutes.</li> <li><strong>Standard:</strong> 3-5 hours.</li> <li><strong>Bulk:</strong> 5-12 hours (lowest cost).</li> </ul> <p><strong>Features:</strong> Vault Lock (WORM compliance).</p>

<h3>AWS Backup</h3> <p><strong>Definition:</strong> Centralized backup service across AWS services.</p> <p><strong>Features:</strong></p> <ul> <li>Policy-based backup plans.</li> <li>Cross-account/cross-region backup.</li> <li>Backup monitoring and reporting.</li> </ul> <p><strong>Supported Services:</strong> EBS, EFS, RDS, DynamoDB, Storage Gateway, FSx.</p>

<h3>Amazon FSx</h3> <p><strong>Definition:</strong> Managed file systems.</p> <p><strong>Types:</strong></p> <ul> <li><strong>FSx for Windows:</strong> Native Windows file server (SMB).</li> <li><strong>FSx for Lustre:</strong> High-performance computing.</li> <li><strong>FSx for NetApp ONTAP:</strong> Enterprise NAS.</li> <li><strong>FSx for OpenZFS:</strong> ZFS file system.</li> </ul> <p><strong>Use Cases:</strong> Windows applications, machine learning, analytics.</p>