StoneFusion Platform®

Store and backup limitless data with a powerful management solution that offer

high availability, agility, and flexibility for your business storage needs.

StoneFusion®, the engine that drives StoneFly’s Intelligent iSCSI and Fibre Channel SAN

StoneFusion® Differentiators & Features:

  • Fully Active/Active Clustered iSCSI SAN storage
  • Fibre Channel SAN target
  • Scale Out NAS
    • Single Namespace
    • No Metadata
    • Add nodes without losing performance
  • Scale Out (Horizontal) or Scale Up (Vertical)
  • Support for iSCSI, NAS (CIFS/NFS), FC, SNMP Traps, UPS, Nagios, RAID Monitoring, Call Home
  • Thin Provisioning
  • StoneFusion® software deployed on Standard x86 / Intel Platforms
  • Leverages off-the shelf, Best-in-Class Hardware for Adaptable Solutions
  • Tightly coupled with Linux Internals including I/O
  • Result: Broad Compatibility, High performance, Quick Product Development
  • Advanced Copy-on-write snapshots
    • Read/Write snapshots
    • Advanced scheduling
    • StoneFly VSS agent available
  • Advanced mirroring
    • Synchronous mirroring
    • Campus mirroring (LAN/WAN) (iSCSI/FC mirroring)
  • Multi-Site/Multi-Appliance Replication and Unified Central Management System
  • Comprehensive enterprise wide performance reporting and statistics, call home, SNMP, etc.
  • Over ½ million lines of code and growing
  • Multi-Gigabit or 10Gb (CX4 or SFP+) support
  • Tiered Storage (SATA, SAS, SSD) support
  • Support for all Virtualization environments
  • iSCSI port teaming, failover, and load balancing
  • Multi-box management
  • Horizontal or vertical scalability
  • Wire speed Performance
  • Volume based encryption (AES256)
  • Data deduplication
  • Dynamic / on-demand, no downtime volume or storage expansion
  • Easy to use, Web-based User Interface
  • Patented I/O Processing in iSCSI Target
    • Conventional Storage Processing:
      • Wait for complete I/Os before beginning processing
      • Processes complete I/Os
      • Transmits complete I/Os
    • StoneFly Approach:
      • Starts processing while I/O is in process
      • Virtualization engine classifies communications to route them efficiently over the network
      • Decreases latency
      • Eliminates I/O bottlenecks
      • Operates seamlessly behind the scenes
    • Benefits: Efficient, concurrent processing, lower latencies

Features & Benefits:



IP Network-based SAN Intelligence Universal connectivity on IP networks

Supports iSCSI and optional FC SAN protocol(s)

Uses existing Ethernet network infrastructure

Lower total cost of ownership by enabling customers to cost-effectively build and manage a SAN that supports networking technologies they already have

Disaster recovery and fault-tolerance Supports corporate business continuity objectives with advanced features, such as Active-Active FailOver clustering, mirroring (local and remote data replication), data migration, and disk-to-disk backup & restore
Storage Provisioning Users can access storage without needing to know where it is located or how it is configured

Maximizes utilization of storage resources and eliminates waste by freeing stranded storage, making it available on the IP network

Allows administrator to quickly respond to changes in storage requirements

SAN-based Backup Helps administrators consolidate backup processes for faster and more reliable backups

Supports disk-based backup for almost instantaneous restores

Integration with Microsoft’s Volume Shadow Copy Services for seamless snapshots

Host Independent HTML-based Management Centralized storage management, control, and monitoring of logical storage volumes

Easy and intuitive to use

Reduction in storage administration overhead

Storage Device Independence Works with SAS, iSCSI and Fibre Channel storage

Easily configured to work with standard off-the-shelf or legacy storage

Access Control Lists Allows administrator to designate which physical storage devices are accessible to individual hosts
Volume Management
StoneFusion’s virtualization engine centralizes volume creation, storage provisioning, and host access in an intuitive GUI. Physical devices are separated from logical devices giving administrators to classify resources into tiers, to design a flexible storage infrastructure that supports multiple types of applications and host systems. Physical devices are pooled and carved into multiple iSCSI volumes to manage availability, performance and reliability. With our flexible management interface, managing storage resources has never been easier.

Learn more with the following White Paper

Storage Consolidation Using a Storage Concentrator



StoneFly’s active/active failover clustering technology enables Storage Concentrators to be deployed in mission critical environments. With seamless field-tested failover technology and load-balancing, Storage Concentrator Clusters increase availability and performance cost effectively, serving as the backbone of a SAN with no single point of failure.

Learn about Clustering technology with the following Datasheet

  StoneFusion Datasheet

StoneFusion Snapshot
StoneFly Snapshot is designed to offer quick, efficient point-in-time replicas of SAN volumes for data recovery, testing, business continuity and more. Each delta-based snapshot is a virtual, temporary, and perishable point-in-time image of an active live volume. With small storage requirements and nearly instantaneous creation, snapshots are an integral part of StoneFly’s advanced SAN and storage management.

Mountable Read-Write Snapshot Volumes

Snapshots contain an image of the volume at the exact point-in-time that the snapshot was taken. The snapshot volume appears to any host machine as if it was a regular logical volume and can be mounted as read-only or read-write. Even after changes are made to the original volume, delta-based snapshots preserve a copy exactly as it existed when it was taken. Any read or write operations do not impact the primary volume. Snapshots persist across reboots and can be mounted and accessed just like any other volume.

Snapshot Scheduler

The StoneFly appliance can automatically take snapshots at predetermined intervals using the Snapshot Scheduler. Administrators can configure the system to automatically take snapshots hourly, daily, weekly and monthly.


Snapshots are not replication, like StoneFly Reflection (Synchronous Mirroring). An exact copy would mean that five Snapshots require five times the storage space of the original. Instead, snapshots use Copy-On-First-Write (COFW) mechanisms that only copy data blocks if and when an application changes them. Often, this “copy” is of a pointer followed by an allocation of a data block.


Rollback is a disaster recovery feature that allows users to return to the last known “good” data point in the event of corruption, viruses, or lost files. Essentially, performing a rollback returns the Live Volume to the known state of one of the Snapshots. All writes that have been completed since the Snapshot was taken are overwritten so that the Live Volume appears just as it was when the Snapshot was taken. You can rollback multiple times to get the desired result. For example, if you rollback to find a lost file and the file isn’t there on the first snapshot used, you can rollback again using an older snapshot to locate the item required.

Learn more with the following White Paper:

Implementing a StoneFly SAN with VSS (Volume Shadow Copy Services)


Reflection Synchronous Mirroring
The StoneFly Reflection™ Synchronous Mirroring feature is designed for IT professionals managing environments where business operations would suffer a severe financial blow if critical data were lost or offline for even a moderate period of time.

Reflection provides continuous access to a SAN volume without interruption to data availability, simplifying disaster recovery and reducing system downtime.

How it Works

StoneFly Reflection Synchronous Mirroring supplies host-independent, mirrored data storage that duplicates production data onto physically separate mirrored target images. This duplication occurs transparently to users, applications, databases, and host processors. The software duplicates block-level changes as they occur to one or more volumes: either to another local Storage Concentrator volume image or to another Storage Concentrator volume image at a campus location over standard IP connections.

High-Availability for Critical Applications

Reflection offers the benefit of protecting a critical volume from being a single point of failure, and providing continuous access to a volume without interruption to data availability when loss of access occurs to one of the images. The result is “Next Generation” performance, reliability and high data availability for critical applications.

Asynchronous Replication

The StoneFly Asynchronous Replication upgrade option allows data to be kept at two or more different locations. The local data volumes are synchronized with mirror volumes at the remote site at irregular intervals. The synchronization operations may be scheduled or allowed to happen at any time the local data volume falls quiet for a prescribed period of time.

Learn more with the following White Paper:

Increasing SAN Uptime with Reflection Synchronous Mirroring


Asynchronous Replication

Asynchronous Replication can be used to replicate data between two or more geographically separate sites. The local data volumes are synchronized with mirror volumes at the remote site at irregular intervals. The synchronization operations may be scheduled or allowed to happen at any time the local data volume falls quiet for a prescribed period of time.

Who Needs Asynchronous Replication?

Asynchronous Replication is associated with a desire to have a level of data recovery in a remote location in the face of a disaster. Recently, more companies have been required to keep data at certain distances (in some cases hundreds of miles) away from the production site to insure protection of the data in the event a disaster at the local site.

How it Works

The StoneFly method for providing asynchronous mirrors includes the ability for the local physical or virtual StoneFly Storage Appliance to identify changes in a volume and periodically move those changes to a remote site. This process is done by coupling StoneFly Reflection Mirroring and Delta-Based Snapshot technology. The StoneFly Snapshot technology tracks the changes in the local (production) volume while the Reflection technology maintains the movement of the data to the mirror image at the remote site.

A simple view of the way StoneFly Asynchronous Replication works is to describe the two volumes that must be synchronized during the mirroring or replication process:

  1. The Remote (Replication) Volume
  2. The Production Volume

Production Volume

The Production Volume is the source of all changes in the replication process. Changes are captured through the use of snapshot technology that tracks all changed blocks in a volume. Once the time for a replication has been identified, a differencing process takes place and all changed blocks are transferred to the remote site. A special set of snapshots are established on the production volume to allow for the differencing process to take place. Once the snapshots have been established on the volume a second step is used to connect the volume to one or more of the available remote volumes.

StoneFly’s snapshot technology uses a separately allocated space in the Resource pool for tracking changes. The allocation of this space for the Production Volume is a buffer against problems with communications to the remote site. A larger snapshot allocation provides more space to hold changes while the communications link may be down.

Remote Volume

The remote volume may also be enabled for snapshots. This is highly recommended to improve the accuracy and stability of the replicated data at the remote site. Each time a set of changes is sent to the remote volume, a snapshot is requested by the StoneFly Storage Appliance at the production site. These snapshots become recovery points at the remote site. The amount of Snapspace allocated at the remote site determines how many recovery points are possible. Allocating a larger Snapspace provides more recovery points up to limit defined by the software implementation.

Data Deduplication
StoneFusion Data Deduplication

StoneFly’s deduplication technology provides optimized data deduplication for increased storage efficiency. StoneFly’s data deduplication capability allows users to fit 5x to 137x more data (depending on the data mix) within the same storage footprint with minimal impacts to overall performance. Block segmentation optimizes efficiency based on data type.

Data Optimization & Efficiency

Of the available data optimization technologies, data deduplication offers the greatest potential to deliver substantial and recurring impact on the cost and manageability of data growth. By reducing storage capacity, organizations will enjoy related cost reductions in areas including storage licensing, storage management, power, cooling, and data center floor space. Data deduplication makes it much more affordable to store, analyze, manage and house your data.

Minimal Performance Impact

StoneFly’s deduplication takes place at the block level. It operates mostly outside the data path of the storage application software as a duplicate advisory service. StoneFly uses parallel deduplication, which greatly reduces the high-write latencies commonly seen with in-line deduplication systems. Featuring a high performance index engine, StoneFly’s deduplication handles heavy workloads and can rapidly identify duplicate data across TeraBytes of data.

How StoneFly’s Deduplication Works

StoneFly’s deduplication index utilizes advanced techniques to identify duplicates across massive storage pools using memory-resident information over 99% of the time, avoiding costly disk access and eliminating the largest single bottleneck in storage deduplication. StoneFly index operations are orders of magnitude faster than other deduplication solutions.

  1. StoneFusion operating system pushes new data and internal placement information to be deduplicated.
  2. Block-aware segmentation breaks larger objects into variable-sized chunks.
  3. Unique content fingerprints are computed.
  4. Patented indexing technologies determine if the chunk has been previously seen.
  5. Previous placement information is pushed asynchronously back to the StoneFusion operating system for unification.

Immediate Cost Savings

Independent validation has demonstrated that StoneFly’s deduplication software offers up to 7x data reduction for general purpose environments, and up to 137x data reduction for virtualization images such as those generated by VMware®. This allows users to greatly reduce their storage footprint along with all of the operating expenses involved.

Host Integration
StoneFly SAN appliances integrate with core Microsoft technologies including Volume Shadow Copy Services, MPIO and Exchange.


Learn more with the following White Papers

Implement StoneFly SAN in Microsoft Exchange Network

Migrating Microsoft Exchange Server to a StoneFly SAN

High Availability & Disaster Recovery for Microsoft Exchange