vzfsync(8) perform fsync/fdatasync/fadvise on files

SYNOPSIS

vzfsync { -s,--sync | -d,--datasync } [-n,--dontneed ] file [
file
 ...]
vzfsync --help

DESCRIPTION

This utility performs fsync(2) or fdatasync(2) for every supplied file name. It can also optionally perform posix_fadvise(2) with the argument of POSIX_FADV_DONTNEED.

It is used from within vzmigrate(8) utility for live migration, right after copying ploop delta files (and before suspending a container) to sync those copied files to disk in order to optimize subsequent ploop mount time and, utlimately, container frozen time.

OPTIONS

-s,--sync
Perform fsync.
-d,--datasync
Perform fdatasync.
-n,--dontneed
Perform posix_fadvise(POSIX_FADV_DONTNEED).

EXIT STATUS

Returns 0 upon success, or an appropriate error code in case of an error:
1
Invalid usage
2
Failed to perform some requested operations on one or many files.

LICENSE

Copyright (C) 2014, Parallels, Inc. Licensed under GNU GPL v2.

SEE ALSO

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