Aspera Sync is a software application that provides high-speed and highly scalable
multi-directional, file-based replication and synchronization. Aspera Sync is designed
to fill the performance gap of uni-directional file synchronization tools like
rsync, which are often slow for synchronizing large files and
large sets of files over the WAN. Additionally, Aspera Sync extends the capability of
uni-directional synchronization tools with full support for synchronization that is
bi-directional and multi-directional.
Aspera Sync offers the following key capabilities:
- Utilizes high-speed Aspera FASP transport for moving data at maximum speed over the WAN,
whereas traditional synchronization tools are built on TCP. Aspera Sync transfers
new data between remote hosts at full bandwidth capacity, regardless of round-trip
delay and packet loss, and does not degrade in performance for large file
- Compares against a local snapshot, thereby avoiding the process of making a comparison
against the remote file system over the WAN, which is used by most traditional tools
and can be slow.
- Recognizes file system changes (such as moves and renames) and propagates
these changes to peers. Traditional tools treat these operations as deletion of old
data and then recreate or retransfer the new data, which can lead to costly data
copying over the WAN.
- Supports bi-directional and multi-directional synchronization topologies, where files are
changing on multiple nodes. For a bi-directional synchronization, Aspera Sync runs
with a bi-directional option. For a multi-directional synchronization, one session
is run for each peer to remain synced. Any topology that has an acyclic graph
topology between peers is supported.
- Uses file system notifications for change notification, when available.
- Monitors file contents and waits for files to be stable (no longer changing in md5sum) before transferring. The wait period is configurable and is designed to avoid transferring only partially complete files.
Aspera Sync is a command-line program called async that, like
rsync, uses an SSH connection to establish connectivity with its
remote peers and is spawned as an SSH subsystem binary on the remote system. The program
can be run one time or periodically (through a cron tab scheduled job) on file systems
that do not provide asynchronous change notification, or in a continuous mode on file
systems that do support asynchronous change notification. Aspera Sync is designed to
process files and transfer new data in a continuous pipeline for maximum speed, even
when running in scan-only mode (when no file system change notification is
Sample Sync Deployment Diagram