Do We Use Both Ceph and PowerStore?

#Infra #Concepts #On-premises

1. What Is Storage, Anyway?

  • Your computer has storage space (SSD, HDD), right?
  • Servers are the same — they need disks to store data.
  • But enterprise data centers have dozens to hundreds of servers, so managing disks separately on each one is a nightmare.

👉 That’s why shared storage was invented → a structure where multiple servers use the same storage pool together.

2. Commercial Storage Like PowerStore

  • A dedicated storage appliance made by Dell (expensive, but stable and easy to manage).
  • Think of it as a “computer built exclusively for storage.”
  • Downsides: costly, vendor lock-in when scaling (you’re tied to Dell hardware), limited expansion flexibility.

3. So What Is Ceph?

  • Ceph is software-defined storage.
  • No dedicated appliances like Dell PowerStore needed — just a bunch of regular servers with hard drives.
  • Connect those servers over a network, install the Ceph software, and they behave like one giant unified storage system.

👉 Simply put:

  • PowerStore = An expensive, purpose-built safe
  • Ceph = A DIY safe built by linking several computers you already have at home

4. Key Features of Ceph

  • Scales whether you have 10 servers or 100
  • Data is automatically replicated across multiple servers, so even if one goes down, your data is safe
  • Supports all three storage modes: block (disk), file (shared folders like NFS), and object (like AWS S3)

5. Diagram

[서버1 + 디스크]   [서버2 + 디스크]   [서버3 + 디스크]
        |                  |                  |
        +------------------+------------------+
                       |
                 [ Ceph 소프트웨어 ]
                       |
          서버들이 가진 디스크를 합쳐서
         "하나의 큰 스토리지"로 제공

👉 Summary:

  • PowerStore 1200T = A high-end storage appliance made by Dell
  • Ceph = Open-source software that turns a cluster of regular servers into a unified storage system

1. How PowerStore 1200T and Ceph Differ in Nature

  • PowerStore 1200T
    • Enterprise-grade commercial storage
    • Strengths: stability, performance, vendor support
    • Weaknesses: expensive, vendor lock-in (Dell only), limited scaling flexibility
    • Primary use: Mission-critical workloads like databases, ERP, and VMware
  • Ceph
    • Open-source distributed storage
    • Strengths: scalability (just add servers to grow capacity and performance), cost efficiency, object storage (S3 API) support
    • Weaknesses: requires in-house operation and management, performance tuning has a learning curve
    • Primary use: Big data, AI/ML, backups, cloud-native apps, internal S3 services

2. Why Use Both?

In a project context, it comes down to separation of purpose.

  • PowerStore

    → Used for core enterprise services (databases, VMs, transaction-critical services)

    → Stability and high performance are paramount, making a commercial appliance the right fit

  • Ceph

    → Used when cloud environments (OpenStack, Kubernetes, etc.) need object storage or a large, horizontally scalable storage pool

    → Examples: research data, log storage, big data, internal S3 services

3. Real-World Examples

  • Banks / large enterprises:
    • Core Banking DB = PowerStore
    • Mobile app logs, image/video storage = Ceph
  • Cloud service providers:
    • Some VM disk storage = commercial storage appliance
    • The rest of large-scale data (backups, customer files) = Ceph

4. What This Means for Your Project

Having PowerStore + Ceph together in your project means:

  • The customer intends to run mission-critical workloads (ERP, databases, etc.) on PowerStore,
  • While operating cloud-native workloads (VMs, containers, object storage services like S3) on Ceph.