06-20-2017
I will write this assuming that the place they are generated/written is Site A and they have clients in Site B.
Even though they two sites may only be 20 miles apart, you may find that there is a much smaller link between the sites. It is common to have 100Mb network at both sites, but only a 2Mb link between them. For small files being read at Site B that is not a problem. The issue is with larger files. I would suggest having a process to get a copy of files to Site B. You could implement some logic like this:-
- When a large file is written to Site A, you should save a timestamp in a reference file and begin a copy to Site B. You can copy however you like, be that (s)ftp, rcp/scp, rsync or anything else that works for you.
- When reading a larger file at site B, read the Site A reference file first and get the timestamp, comparing it with the timestamp of the local file. If the Site B file is up to date, read the local file; if not then read the Site A file.
An alternate may be to remove the Site B file when a new file is written to Site A and atomically copy the file to Site B. That way the Site B client just has to read the Site B file. If that fails (i.e. there is no file) then read the Site A file.
Would either of these work for you?
I hope that it helps,
Robin
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LEARN ABOUT DEBIAN
uml_mount
UML_MOUNT(1) General Commands Manual UML_MOUNT(1)
NAME
uml_mount -- allows to mount UMLFS file system using the fuse libraries
SYNOPSIS
uml_mount [mount-point] [options]
DESCRIPTION
This manual page documents briefly the uml_mount command.
This command uses the FUSE (File system in USErspace) libraries and invokes the FUSE_MOUNT function which expects a mount point and some
parameters as arguments.
This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page. For a practi-
cal example, please refer to the link below.
uml_mount is used to mount UMLFS file system.
ARGUMENTS
mount-point
This is the mount point where to mount the UMLFS file system with.
[options] These are the other options accepted by the 'fuse_mount' function.
General options:
-h The "-h" option prints the help.
-V The "-V" option prints the version.
-o opt,[opt...]
The "-o" option allows to provide further mount (only, not un-mount) option(s) to the command line.
FUSE options:
-d -o debug
The "-d" option enable the debug output. It implies "-f".
-f The "-f" option foregrounds the operation.
-s The "-s" options disable multi-threaded operation.
-o allow_other
The "-o allow_other" option allows access to other users.
-o allow_root
The "-o allow_root" option allows access to root.
-o nonempty
The "-o nonempty" option allows mounts over non-empty file/dir.
-o default_permissions
The "-o default_permissions" enables permission checking by kernel.
-o fsname=NAME
The "-o fsname=NAME" option sets file system name.
-o large_read
The "-o large_read" option issues large read requests (2.4 only).
-o max_read=N
The "-o max_read=N" option sets the maximum size of read requests.
SEE ALSO
The HostFs (link to URL http://user-mode-linux.sourceforge.net/new/hostfs.html) usage explanation within the User-Mode-Linux Web Site
AUTHOR
uml_mount was written by Jeff Dike.
This manual page was written by Stefano Melchior (stefano.melchior@openlabs.it) for the Debian GNU/Linux system, based on material in the
Official User Mode Linux Web Site.
UML_MOUNT(1)