Snapshot Replication Technical Specifications

Snapshot Replication

Features

Schedulable and near-instantaneous data protection
Supports various replication topologies for different scenarios, including active-active, extended replication, one-to-many and hub-to-spoke
Fast data recovery on the disaster recovery site
Supports snapshot features for shared folders in Btrfs volume and LUNs, including schedule, management, browse, recovery
Supports snapshot preview and file copy in File Station
Supports snapshot preview, file copy, and recovery in Windows File Explorer

Specifications

Customizable snapshot and replication schedules
- Snapshot can be taken every 5 minutes
- A replication task for a shared folder can be executed every 5 minutes
- A replication task for a LUN can be executed every 15 minutes
Maximum number of snapshots per system:
- Memory exceeding or equivalent to 2 GB (factory-installed): 65,536
- Others: 4,096
Maximum number of snapshots per shared folder:
- Memory exceeding or equivalent to 2 GB (factory-installed): 1,024
- Others: 256
Maximum number of snapshots per LUN: 256
Maximum number of replication tasks
- FS, HD, SA, UC, XS/XS+ series
  - 64 tasks per system (for both shared folders and LUNs in total)
    - 64 tasks for shared folders
    - 32 tasks for LUNs
- Plus, DVA series
  - 32 tasks per system (for both shared folders and LUNs in total)
    - 32 tasks for shared folders
    - 16 tasks for LUNs
- Others
  - 16 tasks per system (for both shared folders and LUNs in total)
    - 16 tasks for shared folders
    - 8 tasks for LUNs
Customizable retention rules for different snapshot management demands
- Numbers of latest snapshot to keep
- Keep all snapshots for
- Advanced retention policy
Snapshot size calculation for space management
Online preview of snapshot content and downloading single file in snapshots
Supports importing the initial replication data to the destination server with an external storage device to reduce the replication time
Customizable IP address and port of a replication task
Replication transmission encryption
Customizable number of concurrent tasks for better system resource allocation
Restoration of files and folders by using Windows Previous Versions
Verification tests on site recovery

Limitations

Only shared folder snapshots support:
- Online preview of snapshot content
- File and folder restoration using Windows Previous Versions
- Calculation of snapshot size for space management
Snapshots cannot be taken if there is less than 100 MB of available space on the volume
NFS permission cannot be recorded in snapshots
Data in the recycle bin are recorded in snapshots
Encrypted shared folders do not support online preview of snapshot content
Each one-to-many/extended replication supports three different sites as destination sites at most
The number of concurrent tasks is only configurable on models with more than 2 CPU threads (Learn more about each model's CPU threads)