What is Block Storage?
Block storage is a method of storing data in fixed-size units called “blocks.” Each block is assigned a unique identifier and can be stored, retrieved, or modified independently. This architecture is known for high performance, low latency, and scalability, especially in environments with high IOPS requirements.
It is commonly used in:
- Transactional databases
- Virtual machines
- Email and application servers
- Mission-critical enterprise systems
Open-E JovianDSS uses ZFS-based block volumes (zvols) to deliver high-performance block storage via iSCSI, Fibre Channel, and NVMe over Fabrics, making it a powerful solution for virtualization, business continuity, and enterprise storage.
Key Benefits of Block Storage
- High performance: Delivers fast read/write operations for I/O-intensive workloads
- Low latency: Ideal for real-time applications and VMs
- Flexible integration: Supports any file system or raw device access
- Scalable architecture: Suitable for small setups and large enterprise infrastructures
- Protocol support: Works with iSCSI, Fibre Channel, and NVMe – all supported in Open-E JovianDSS
In Open-E environments, block storage is enhanced by features like snapshots, thin provisioning, asynchronous replication, and high-availability clustering.
Block vs File and Object Storage
Open-E JovianDSS supports both block and file storage, but block storage is preferred when performance and control are critical.
| Feature | Block Storage | File Storage | Object Storage |
| Structure | Raw data blocks | Files and folders | Metadata-rich objects |
| Performance | Very high | Medium | Variable |
| Use cases | VMs, databases, SAN | File sharing, NAS | Backup, cloud apps |
| Protocols | iSCSI, FC, NVMe | SMB, NFS | REST, S3 |