Native ZFS VDEV for Object Storage (OpenZFS Summit)

Why It Matters

Native VDEV integration transforms ZFS into a cost‑effective, high‑throughput cloud NAS, reshaping enterprise storage economics and simplifying multi‑cloud deployments.

Key Takeaways

• objbacker.io bypasses FUSE, using native ZFS VDEV
• Achieves 3.7 GB/s read, 2.5 GB/s write from S3
• Aligns 1 MB ZFS blocks to single objects
• Hybrid tiering cuts NAS costs over 70%
• MayaScale delivers sub‑millisecond NVMe‑oF block storage

Pulse Analysis

The introduction of objbacker.io marks a pivotal shift in how ZFS can consume cloud object stores. By implementing a dedicated VDEV type that talks directly to a userspace daemon via a character device, the architecture removes the double‑context‑switch penalty inherent in FUSE‑based mounts. This streamlined I/O path not only reduces latency but also enables ZFS to treat each 1 MB block as a discrete object, capitalizing on the optimal throughput characteristics of S3, GCS, and Azure Blob. For enterprises, this means a true hybrid storage tier where metadata stays on high‑performance NVMe while bulk data lives cost‑effectively in object storage.

Performance benchmarks conducted on AWS c5n.9xlarge instances demonstrate the practical impact of this design. With six striped S3 buckets and ten parallel FIO jobs, objbacker.io sustained 3.7 GB/s sequential reads and 2.5 GB/s writes, effectively saturating the 50 Gbps network link. The alignment of ZFS recordsize to object size eliminates additional buffering, allowing direct PUT and GET operations. Compared to traditional FUSE‑based solutions, which suffer from multiple kernel‑user transitions, the native VDEV delivers a clear throughput advantage, making high‑speed cloud NAS viable for data‑intensive workloads.

Beyond raw numbers, the broader market implication is significant. MayaNAS leverages ZFS’s special device architecture to offer a single filesystem that intelligently routes workloads across performance tiers, delivering over 70% cost savings versus pure block‑storage alternatives like EBS or EFS. Coupled with MayaScale’s sub‑millisecond NVMe‑oF block service, Zettalane provides a comprehensive, multi‑cloud storage stack that can be deployed via unified Terraform modules across AWS, Azure, and GCP. This unified approach reduces operational complexity and positions ZFS as a competitive backbone for modern hybrid cloud strategies, potentially accelerating adoption among enterprises seeking both performance and economic efficiency.