FPSYNC(1) | General Commands Manual | FPSYNC(1) |
fpsync
—
Synchronize directories in parallel using fpart and
rsync.
fpsync |
[-h ] [-v ]
[-n jobs]
[-f files]
[-s size]
[-w wrks]
[-d shdir]
[-t tmpdir]
[-r jobname]
[-o rsyncopts]
[-O fpartopts]
[-S ] src_dir/
dst_dir/ |
The fpsync
tool synchronizes directories
in parallel using fpart(1) and rsync(1).
It computes subsets of src_dir/ and spawns
rsync(1) jobs to synchronize them to
dst_dir/.
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
filesystems.
-h
-v
-n
jobs-f
files-s
size-w
wrks-d
shdirfpsync
shared 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
fpsync
.-t
tmpdirfpsync
temporary directory to
tmpdir. This directory remains local and does not
need to be shared amongst SSH workers when using the
-w
option. Default:
/tmp/fpsync-r
jobname-v
). Note that filesystem crawling is skipped when
resuming a previous run. As a consequence, options
-f
, -s
,
-o
, -O
,
-S
, src_dir/, and
dst_dir/ are ignored.-o
rsyncopts--delete
). Default: -av
--numeric-ids
-O
fpartopts-x .zfs -x .snapshot* -x .ckpt
-S
fpsync
).Each fpsync
run 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
-r
). fpsync
will 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
and fpsync
will exit immediately.
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 fpsync
process.
Whether you use verbose mode or not, everything is logged within shdir/log/.
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).
Parallelizing rsync(1) makes several options not
usable, such as --delete
. If your source directory
is live while fpsync
is running, you will have to
delete extra files from destination directory. This is usually done by using
a final -offline- rsync(1) pass that will use this
option.
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
vfs_timestamp(9).
Fpsync has been written by Ganaël LAPLANCHE and is available under the BSD license on http://contribs.martymac.org
No bug known (yet).
January 27, 2015 | Debian |