Fsdss825 <High Speed>

| Goal | Description | Success Metric | |------|-------------|----------------| | G1 – Linear Scalability | Throughput should increase proportionally with added nodes. | Throughput ∝ #Nodes (R² ≥ 0.98). | | G2 – Strong Consistency | All successful writes must be visible to subsequent reads. | 99.999% read‑after‑write success. | | G3 – Fault Tolerance | Preserve data integrity under node failures without service interruption. | ≤ 0.01 % data‑loss probability for up to f = ⌊m/2⌋ failures. | | G4 – Storage Efficiency | Minimize overhead while maintaining G3. | Storage overhead ≤ 1.5× (k + m)/k. | | G5 – End‑to‑End Confidentiality | No clear‑text data or metadata on disk/network. | Zero‑knowledge proof of encryption; no plaintext exposure in logs. | | G6 – Compliance & Auditing | Provide immutable, queryable logs for regulatory purposes. | Full‑traceability of every operation with tamper‑evident signatures. | | G7 – Low Tail Latency | 99th‑percentile request latency ≤ 5 ms for GET/PUT of ≤ 1 MiB objects. | Measured 99th‑pct latency ≤ 5 ms. |

| System | Consistency | Erasure Coding | Encryption | Scalability | Primary Use‑Case | |--------|-------------|----------------|------------|-------------|------------------| | Ceph (BlueStore) | Strong (CRUSH + Paxos‑based OSD map) | Optional (EC pool) | Optional (client‑side) | Excellent (thousands of OSDs) | General‑purpose object/block storage | | MinIO | Strong (distributed lock manager) | Reed‑Solomon (default) | Server‑side SSE‑KMS | Good (up to 200 nodes) | Cloud‑native object store | | Amazon S3 | Strong (read‑after‑write) | Internal (redundancy) | Server‑side SSE‑S3/SSE‑KMS | Near‑infinite (AWS) | Public cloud object storage | | CockroachDB | Strong (Raft) | No (row‑level replication) | Optional (TLS) | Moderate (few hundred nodes) | Distributed OLTP | | HDFS | Weak (eventual) | RS/EC optional | Optional (KMS) | Good (thousands of DataNodes) | Hadoop batch processing | | GlusterFS | Weak (eventual) | No | Optional (client‑side) | Moderate | File‑system overlay | fsdss825

Table 1 – Comparison of prominent distributed storage solutions. | Goal | Description | Success Metric |

Figure 1 depicts the logical architecture. The system consists of three principal layers: | System | Consistency | Erasure Coding |

Client → AG → MS ↔ HPR ↔ GCOD
                 ↘
                  ↔ SL (PGs) ↔ Storage Daemons (SD)

All inter‑component communication uses mutual TLS (mTLS) with TLS‑13 cipher suites.