|FPSYNC(1)||General Commands Manual||FPSYNC(1)|
fpsynctool synchronizes directories in parallel using fpart(1) and rsync(1) or cpio(1). It computes subsets of src_dir/ and spawns jobs to synchronize them to dst_url/.
Synchronization jobs can be executed either locally or remotely
(using SSH workers, see option
-w) and are executed
on-the-fly while filesystem crawling goes on. This makes
fpsync a good tool for migrating large
- Print help
- Verbose mode. Can be be specified several times to increase verbosity level.
- External copy tool used to synchronize files. Currently supported tools are: rsync and cpio. Default: rsync. When using cpio and more than one worker, directory timestamps may not be replicated. A second pass will fix them. See the README file for more details.
- Start jobs concurrent sync jobs (either locally or remotely, see below). Default: 2
- Transfer at most files files or directories per sync job. Default: 2000
- Transfer at most size bytes per sync job.
Default: 4294967296 (4 GB)
- Work on a per-directory basis (rsync tool only). In that mode,
fpsyncworks with lists of directories instead of files. That mode may generate coarse-grained lists but enables rsync(1) 's
--deleteoption by default ( WARNING!!! ), making it a good candidate for a final (cleaning) pass after several incremental passes using standard (file) mode.
- Use remote SSH wrks to synchronize files. Synchronization jobs are executed locally when this option is not set. wrks is a space-separated list of login@machine connection strings and can be specified several times. You must be allowed to connect to those machines using a SSH key to avoid user interaction.
fpsyncshared directory to shdir. This option is mandatory when using SSH workers and set by default to tmpdir when running locally. The specified directory must be an absolute path ; it will be used to handle communications with SSH hosts (sharing partitions and log files) and, as a consequence, must be made available to all participating hosts (e.g. through a r/w NFS mount), including the master one running
fpsynctemporary directory to tmpdir. This directory remains local and does not need to be shared amongst SSH workers when using the
-woption. Default: /tmp/fpsync
- Resume job jobname and restart synchronizing
remaining partitions from a previous run. jobname
can be obtained using verbose mode (see option
-v). Note that filesystem crawling is skipped when resuming a previous run. As a consequence, options
-S, src_dir/, and dst_url/ are ignored.
- Override default rsync(1) or cpio(1)
options with toolopts. Use this option with care as
certain options are incompatible with a parallel usage (e.g. rsync's
--delete). Default for rsync:
-lptgoD -v --numeric-ids. Empty for cpio.
- Override default fpart(1) options with
-x .zfs -x .snapshot* -x .ckpt
- Sudo mode. Use sudo(8) for filesystem crawling and synchronizations.
- Source directory. It must be absolute and available on all participating
hosts (including the master one, running
- Destination directory or URL (rsync tool only). If a remote URL is provided, it must be supported by rsync(1). All participating workers must be able to reach that target.
fpsyncrun generates a unique jobname, which is displayed in verbose mode (see option
-v) and within log files. You can use that jobname to resume a previous run (see option
fpsyncwill then restart synchronizing data from the parts that were being synchonized at the time it stopped.
This unique feature gives the administrator the ability to stop
fpsync and restart it later, without having to
restart the whole filesystem crawling and synchronization process. Note that
resuming is only possible when filesystem crawling step has finished.
During synchronization, you can press CTRL-C to interrupt the
process. The first CTRL-C prevents new synchronizations from being submitted
and the process will wait for current synchronizations to be finished before
exiting. If you press CTRL-C again, current synchronizations will be killed
fpsync will exit immediately. When using option
-E to enable directory mode and rsync's
--delete option, keep in mind that killing rsync
processes may lead to a situation where certain files have been updated and
others not deleted yet (because the deletion process is postponed using
On certain systems, CTRL-T can be pressed to get the status of
current and remaining parts to be synchronized. This can also be achieved by
sending a SIGINFO to the
Whether you use verbose mode or not, everything is logged within shdir/log/.
EXAMPLES¶Here are some examples:
fpsync -n 4 /usr/src/ /var/src/
Synchronizes /usr/src/ to /var/src/ using 4 local jobs.
fpsync -n 2 -w login@machine1 -w login@machine2 -d /mnt/fpsync /mnt/src/ /mnt/dst/
Synchronizes /mnt/src/ to /mnt/dst/ using 2 concurrent jobs executed remotely on 2 SSH workers (machine1 and machine2). The shared directory is set to /mnt/fpsync and mounted on the machine running
fpsync, as well as on machine1 and machine2. The source directory (/mnt/src/) is also available on those 3 machines, while the destination directory (/mnt/dst/) is mounted on SSH workers only (machine1 and machine2).
LIMITATIONS¶Parallelizing rsync(1) or cpio(1) makes several options not usable, such as rsync's
--delete. If your source directory is live while
fpsyncis running, you will have to delete extra files from destination directory. This is traditionally done by using a final -offline- rsync(1) pass that will use this option, but you can also use
-Eto perform the same task using several workers.
fpsync enqueues synchronization jobs on
disk, within the tmpdir/queue directory. Be careful
to host this queue on a filesystem that can handle fine-grained mtime
timestamps (i.e. with a sub-second precision) if you want the queue to be
processed in order when fpart(1) generates several jobs
per second. On FreeBSD, VFS(9) timestamps' precision can
be tuned using the 'vfs.timestamp_precision' sysctl. See
Contrary to rsync(1),
fpsync enforces the final '/' on the source
directory. It means that directory contents are
synchronized, not the source directory itself (i.e. you will not get a
subdirectory of the name of the source directory in the target directory
SEE ALSO¶cpio(1), fpart(1), rsync(1), sudo(8)
AUTHOR, AVAILABILITY¶Fpsync has been written by
Ganaël LAPLANCHE and is available under the BSD license on http://contribs.martymac.org
BUGS¶No bug known (yet).
|January 27, 2015||Linux 4.19.0-6-amd64|