Sync Command Examples
- Continuous synchronization of a daily archive of large files on a Windows machine to
Linux machine, preserving Windows acls, run as an async pull on the
$ async -L /sync/logs -N backup -d /sync/backup -r firstname.lastname@example.org:"C:\data\" -i /.ssh/lion_private_key -K pull --remote-scan-interval=4h --preserve-acls=metafile --remote-preserve-acles=metafile -C --exclude-dirs-older-than=1w0d0h0m0s
- Logs are stored on the Linux machine in the specified location.
- The user, lion, authenticates with an SSH key using the -i
- Because the files in the backup are large, remote-scan-interval
is used to scan the Windows machine every 4 hours, which forces an additional scan
in case any notifications are missed.
- In order to preserve Windows acls in the backup, both
remote-preserve-acls=metafile must be specified.
- Since the archive directory creates a new directory for each day, use
exclude-dirs-older-than=1w0d0h0m0s to avoid scanning directories
that are no longer changing (older than a week).
- High performance push synchronization of many (10,000s) of small files (<10 KB)
> async -L c:/logs:200 -q -N small-files -c none --pending-max=10000 --preserve-acls=native --transfer-threads=4 -R c:/logs:200 -d c:/data/ -r email@example.com:"C:\data\" -K push -l 500m
- Specifying the logging locations (-L and -R) is
optional. Adding :200 to the end of the log directory value allows
the logs to reach 200 MB before being rotated.
- If the connection is secure, disabling encryption using -c none
may boost performance.
- Increase the number of pending files from the default of 2000 using
- The --preserve-acls=native option preserves Windows ALCs.
- Using more FASP threads to move the data can improve performance, set with
--transfer-threads=4. The number of threads should not exceed the
number of CPU cores (the lower value of the client and server machines).
- The user must enter the password at the prompt because it is not provided in the
command. Aspera recommends using SSH keys for authentication, but this is not
- Non-continuous bidirectional synchronization of directories containing a mix of large
and small files in which small files are synced using one thread and large files use
another, run on a Linux machine to a Mac OS X
$ async -L /sync/logs -q -N sync-2017-01-01 -d /images --firstname.lastname@example.org --host=10.4.25.10 -r Library/data/images -i /lion/.ssh/lion_private_key -R Library/sync/logs --transfer-threads=2:100k -K bidi
- Logs are saved in the specified locations on both machines.
- The user authenicates with an SSH key using the -i option.
- The user and host are specified as separate options, rather than as part of the
destination folder, so that the username with an @ can be used (@ is reserved in an
-r argument for specifying the host).
- The sync uses two threads, one for files larger than 100 KB and one for files less
than or equal to 100 KB, specified with the --transfer-threads
- Non-continuous push synchronization through reverse Aspera
$ async -N pushproxy -d /images -r email@example.com:/data/images --proxy=dnats://gazelle:firstname.lastname@example.org -K push
- The transfer username on the destination (10.0.0.1) is lion, the proxy IP address
is 10.0.0.4, and the proxy username is gazelle.
- The Proxy URL option must include the proxy user's password.
Sync Output Example
When Sync is run in interactive mode, the status of each file in the synchronized directory is
displayed in a list similar to the following:
The status may be one of the following options:
- SYNCHRONIZED: file transferred
- SYNCHRONIZED(skp): file skipped
- SYNCHRONIZED(del): file deleted
- SYNCHRONIZED(ddp): dedup (duplicate files present)
- SYNCHRONIZED(exs): file exists
- SYNCHRONIZED(mov): file has changed (renamed, moved, or different attributes)