Enterprise-Grade NAS Storage Appliances Scale-Out · Air-Gapped · Ransomware-Proof Starting at $2,495 · DCIG Top 5 Ranked 2025–2026
Your NAS is the most common ransomware target in your infrastructure — and most enterprise NAS appliances ship with zero built-in protection. StoneFly SSO NAS is different: Air-Gapped Vault®, file-level WORM, immutable snapshots, and integrated threat detection come standard on every node, on the patented StoneFusion™ 8th Gen OS. Deploy as single-node, dual-node, or scale out to 128 nodes — and know your data is protected from day one.
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Turnkey Storage Solution for Unstructured Workloads
StoneFly SSO NAS Storage Appliances deliver enterprise-grade NFS, SMB, and CIFS file storage on the patented StoneFusion™ OS. From single-node deployments to 128-node scale-out clusters, every appliance ships with integrated security, automated threat detection & response, cloud connect, and multi-site management — no additional licensing required. Purpose-built for healthcare, financial services, media production, oil & gas, and government workloads.
StoneFly SSO NAS vs Dell PowerScale vs HPE StoreEasy
Most enterprise NAS vendors charge extra for the security capabilities StoneFly ships as standard. Here's how they compare on the features that matter most to IT security and compliance teams.
| Feature | StoneFly SSO NAS | Dell PowerScale | HPE StoreEasy |
|---|---|---|---|
| PatentedAir-Gapped / Immutable Storage | ✓ Built-in | Add-on module | Limited / 3rd party |
| Integrated Threat Detection & Response | ✓ Built-in | Separate license | Not included |
| File-Level WORM (Immutability) | ✓ Built-in | ✓ Available | Limited |
| Multi-Site Single-Pane Management | ✓ Built-in | ✓ Available | Separate tool |
| Pre-Installed Cloud Connect | ✓ Built-in | Add-on | Add-on |
| Scale-Out to 128 Nodes | ✓ Up to 128 | ✓ Scale-out | Limited scale-out |
| DCIG Independent Recognition | ✓ Top 5 2025–26 | — | — |
| Starting Price | $2,495 | $10,000+ | $5,000+ |
Dell PowerScale and HPE StoreEasy pricing and feature availability based on published specifications. Security add-on costs vary by configuration. Download the full comparison sheet for detailed analysis.
Download Full Comparison SheetStoneFly SSO NAS Can Be Set Up As
Choose the configuration that fits your workload today — and scale it without architecture changes tomorrow.
The Operating System Inside Every StoneFly Appliance
StoneFusion™ is the patented storage virtualization engine that powers every StoneFly NAS appliance. The 8th generation delivers high-performance NAS with built-in data security, intelligent storage optimization, and unified management — all from a single pane of glass. It includes automated threat detection and response to protect file data against ransomware, centralizedHere's the NAS-focused rewrite of the StoneFusion OS description:
See StoneFusion™ in Action
Click any video to watch a live feature demonstration directly on YouTube.
Preinstalled — NAS Storage Optimization Features
StoneFly scale-out NAS systems can start from a few nodes and seamlessly scale out to 128 nodes. Every node ships with these capabilities preinstalled — no additional licenses.
Built-In Data Protection — No Add-On Licensing
StoneFly NAS storage devices deliver highly secure and ransomware-proof file storage using the following features. Everything ships preinstalled — no extra licensing required.
Sync & Async Replication
- Synchronous replication across multiple appliances on the same LAN — zero RPO
- Asynchronous replication across WAN and multi-site environments
- Cloud gateway replication to Azure, AWS, and StoneFly Private Cloud
- Policy-based schedules with bandwidth throttling for WAN efficiency
- Air-Gapped Vault®Patented physical and logical network isolation. Ransomware cannot traverse an air gap.
- File-Level WORMPolicy-based write-once immutability. Supports SEC 17a-4, FINRA 4511, and CFTC 1.31 compliance.
- Immutable SnapshotsRansomware-proof point-in-time copies. Restore to any snapshot instantly.
- Integrated Threat DetectionReal-time behavioral analytics monitor every I/O operation for anomalous activity.
- Volume Deletion ProtectionStop rogue admin deletions. Require MFA-gated confirmation to delete any volume.
- Multi-Factor AuthenticationMFA enforcement for all administrative access to StoneFusion™ management console.
Cloud Connect — Built Into Every Appliance
Every StoneFly SSO NAS ships with Pre-installed Cloud Connect. Tier cold data, replicate backups, and extend your NAS to public and private cloud without third-party gateways or additional software licenses.
Turn Your NAS into a Ransomware-Proof Veeam Backup Repository
StoneFly SSO NAS is Veeam Ready certified. Pair it with Veeam Backup & Replication to protect your entire environment — then store those backups in an Air-Gapped Vault® repository that ransomware physically cannot reach.
- 1 Add SSO NAS as a Veeam backup repository — detected automatically as a Veeam Ready device.
- 2 Veeam backup jobs run on your existing schedule — VMs, physical servers, NAS shares, cloud workloads.
- 3 StoneFusion™ applies WORM policy to backup files — immutable for the configured retention period.
- 4 Air-Gapped Vault® schedule activates — the repository is physically disconnected from the network.
- 5 In the event of a ransomware attack, restore directly from the air-gapped, immutable backup copy.
- ✓VMware vSphere VMs
- ✓Microsoft Hyper-V VMs
- ✓Physical Windows & Linux servers
- ✓NAS file shares (NFS, SMB)
- ✓Microsoft 365 (Exchange, SharePoint, Teams, OneDrive)
- ✓AWS EC2 and Azure VMs
- ✓Kubernetes persistent volumes
- ✓Oracle, SAP HANA, and SQL Server databases
Already running Veeam? SSO NAS drops in as an additional repository — no changes to your existing Veeam jobs, policies, or licensing required.
Start from a Few Terabytes — Scale Out to Petabytes
Two independent scaling paths let you right-size today and expand tomorrow — without downtime or forklift upgrades.
Expand capacity within an existing node by adding drives to empty bays or attaching EBOD expansion shelves. No downtime. No data migration. Instant usable capacity from the same management interface.
Add new nodes to the scale-out cluster to grow both capacity and performance simultaneously. Each node adds CPU, RAM, and drives to the pool. Scale from 3 to 128 nodes — linear gains, no bottlenecks.
StoneFly NAS Appliances Are Flexible, Adaptable & Customizable
Three NAS architectures — purpose-built for different workload profiles. All share the same StoneFusion™ OS and full security stack.
- 100% flash drive bay configurations (NVMe and SSD)
- Sub-millisecond latency for real-time analytics, AI/ML inference, and VDI
- Built-in flash optimization: deduplication, compression, thin provisioning
- Sustained throughput for video editing and media production pipelines
- Full StoneFusion™ feature set: WORM, Air-Gapped Vault®, replication, snapshots
- Combines NVMe flash cache with high-capacity SAS/SATA HDDs
- Intelligent auto-tiering moves hot data to flash, cold data to capacity tier
- Deduplication, compression, snapshots, cloud tiering, WORM, and replication
- Right-size your flash-to-HDD ratio for your specific workload profile
- Lower cost per terabyte than all-flash, near-flash performance for hot data
- High-density HDD configurations with 108-bay JBOD expansion support
- Lifecycle management policies to migrate aging data from primary NAS automatically
- File-level WORM and immutability for SEC, FINRA, and CFTC compliance
- Cloud tiering to Azure, AWS, and StoneFly Private Cloud for cost-effective retention
- Integrated ransomware protection — even cold archives are protected
Single Node NAS vs Scale-Out NAS — What's the Difference?
StoneFusion™ supports both single-node NAS volumes and scale-out NAS volumes. Single-node volumes offer higher raw performance for compatible workloads. Scale-out volumes add enterprise data protection features essential for compliance and long-term retention.
| Feature | Single Node NAS | Scale-Out NAS |
|---|---|---|
| Erasure Coding | ✗ Not Supported | ✓ Supported |
| Directory Quotas | ✗ Not Supported | ✓ Supported |
| Storage Tiering | ✗ Not Supported | ✓ Supported |
| File-Level WORM | ✗ Not Supported | ✓ Supported |
| Mirroring | ✗ Not Supported | ✓ Supported |
| Asynchronous Replication | ✗ Not Supported | ✓ Supported |
| Immutable Snapshots | ✗ Not Supported | ✓ Supported |
| Expanding by Adding Segments | ✗ Not Supported | ✓ Supported |
| Deduplication | ✓ Supported | ✓ Supported |
| NFSv3 / NFSv4 | ✓ Supported | ✓ Supported |
| Managed Storage + Flash Cache | ✓ Supported | ✓ Supported |
CIFS / SMB Export Note: When CIFS export is enabled, both Single Node and Scale-Out volumes support session encryption, DOS attribute handling, extended attribute control, and a recycle bin for recoverable deletes.
Custom-Build Your Enterprise NAS Storage Appliance
Four hardware series — from compact edge appliances to high-density scale-out clusters. All run StoneFusion™ 8th Gen OS and include the full security stack.
XS-Series vs XD-Series — Detailed Specifications
| Features | XS-Series (Mid-tier NAS) | XD-Series (Enterprise-tier NAS) |
|---|---|---|
| Appliances | 8 to 108-bay appliances | 8 to 108-bay appliances |
| Processor | 10 to 28 Core Xeon Processor | Dual 10 to 28 Core Xeon Processor |
| RAM | 32GB to 512GB | 64GB to 1TB |
| Network Ports | Dual 1/10/40/100Gb | Dual 1/10/40/100Gb |
Three Pillars of Enterprise NAS Security
Every StoneFly SSO NAS appliance ships with three interlocking security layers. Not optional add-ons — built into the OS.
Patented physical and logical network isolation. Define a vault schedule — StoneFly disconnects the NAS from the network automatically. Ransomware cannot traverse an air gap. Available as logical air-gap (Always On-Air®) or physical isolation nodes. Every vaulted copy is immutable and off-network.
Real-time behavioral analytics monitor every I/O operation across all nodes. Anomalous access patterns — lateral movement, mass encryption attempts, credential abuse, exfiltration attempts — trigger immediate alerts and automated quarantine. No separate SIEM configuration required.
Single-pane-of-glass dashboard shows all storage nodes, security events, replication status, backup jobs, and system health across every site — in real time, with customized multi-site reporting. Know your entire storage posture from one screen.
One Security Dashboard. Every Site. Fully Automated.
StoneFusion™ monitors every node across every location in real time — detecting anomalous behavior, triggering automated responses, and surfacing a unified security posture across your entire NAS infrastructure from a single pane of glass.
What the Dashboard Covers
- Real-time threat alerts with severity classification
- Volume health and I/O anomaly heatmaps per site
- Replication and snapshot status across all nodes
- Air-Gapped Vault® schedule and isolation confirmation
- User access logs and privilege escalation events
- Automated response actions log with timestamps
- Compliance report generation (SEC, FINRA, HIPAA)
- Capacity and performance metrics across all sites
Ready to See SSO NAS in Your Environment?
Book a 30-minute demo. We'll size your solution, walk through your use case live, show you the pricing, and send a written quote before we hang up. No commitment required.
Built for Regulated Industries
StoneFly SSO NAS meets the immutability and audit-trail requirements of leading financial, healthcare, and government compliance frameworks. DCIG independently verified Top 5 ranking for 2025–2026.
StoneFly SSO NAS meets the write-once/read-many requirements of SEC Rule 17a-4(f), FINRA Rule 4511, and CFTC Rule 1.31 through patented Air-Gapped Vault® and file-level WORM, and immutable snapshots. Every appliance is Veeam Ready certified.
Trusted by Companies Worldwide
"DR365 backup and replication appliance is a versatile box — you can configure it as a VMware host running multiple Virtual Machines and as a high-performance NAS. Really easy to manage and extend for more space."
"StoneFly's flexible backup grew with us, safeguarding our business and providing an integrated, stable foundation for our entire storage infrastructure."
What Happens After You Buy
Enterprise storage is a long-term relationship. Here's exactly what StoneFly customers get after the purchase order is signed.
Our pre-sales engineers answer technical questions, size configurations, and walk through your environment — no sales pressure, no obligation.
Let StoneFly Run It for You
Not every organization has the internal bandwidth to manage enterprise NAS infrastructure at its best. StoneFly's optional Professional Services team handles the ongoing work — so your IT staff can focus on business priorities instead of storage operations.
Some customers want full managed operations. Others want a one-time security hardening review. We scope every engagement to your team's capabilities and availability. Ask about Professional Services during your 30-minute demo.
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Technical documentation, competitive comparisons, and analyst reports for StoneFly SSO NAS.
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