Thread: rsync and CF

i would agree, a command line interface to update the database would be nice.
as an added bonus a switch that you could pass to it to shut down the system after it updates the database.

You have to install Cygwin on your windows pc, only the rsync exe is possible also but I believe you then have to fiddle first with DLL's etc... so it can run the code.
But having cygwin installed on you carpc is a luxory is you are used to work with linux, so you can do a lot of nice tricks with it.

A few month ago I planned to write sometinhg that generates the music database file on a server or so and then rsync everything to my carpc everytime I have a internet connection (wifi, gprs..) It is not yet ready cause I do not have much time anymore and I have to generate the music db on a linux machine but now with CF1.3x out I will try to get it out of the dust again.

For those who do not know rsync: It only copies the difference between files (even binary) so very low bandwith needed!! So a 10GB archive need to be synced and only for xmpl a filename is changed then is is synced in 1-2 sec's.

For those who do not know what Cygwin is: Cywin is a Linux enviroment which can be ran on a windows machine. Mainly command line tools are available but also a grafical desktop is possible. It just brings me to the idea to try to embad cygwin desktop into CF13

Originally Posted by Micke

Hi babazoid,

I would like to try Rsync, but I can't find a version for XP, only for Linux/Unix.

Can you post a link where I can get it?

Thanks,
Micke

This is a package of what you need, docs are on the site...

http://www.itefix.no/phpws/index.php...position=23:23

Let me know if you need help configuring it.

Mark

rsync is great, but it is mainly designed for making copies of a master filesystem. As soon as I move into my house (and have WiFi in the garage) I am going to be looking at Unison, it uses the rsync technology, but is designed for keeping two different locations in sync, so you can make changes at either end.

btw, approximately how quickly does it run if there are no changes, and how many files/GB are you syncing? What speed is your WiFi?

Thanks!

Originally Posted by zPilott

rsync is great, but it is mainly designed for making copies of a master filesystem. As soon as I move into my house (and have WiFi in the garage) I am going to be looking at Unison, it uses the rsync technology, but is designed for keeping two different locations in sync, so you can make changes at either end.

btw, approximately how quickly does it run if there are no changes, and how many files/GB are you syncing? What speed is your WiFi?

Thanks!

And tar was designed to put files together to be stored on tape Obviously some tools transcend their original design. I would have to disagree that rsync isn't suited to keeping two directories in sync, it's works perfectly!

Wirelessly I get speeds of about 1 MB/s, I just tested it and it took 1m 36s to transfer a 106,557,568 byte file (1050570 bytes/sec to be precise) Wired, using a crossover cable I get speeds of about 8MB/s.

If there is nothing to update it takes about half a second to complete the sync process.

Mark

Originally Posted by babazoid

And tar was designed to put files together to be stored on tape Obviously some tools transcend their original design. I would have to disagree that rsync isn't suited to keeping two directories in sync, it's works perfectly!

Wirelessly I get speeds of about 1 MB/s, I just tested it and it took 1m 36s to transfer a 106,557,568 byte file (1050570 bytes/sec to be precise) Wired, using a crossover cable I get speeds of about 8MB/s.

If there is nothing to update it takes about half a second to complete the sync process.

Mark

I'm not saying that it can't work, what I am saying is that rsync compares A and B and fixes up B to look like A.

I am personally interested in unison, because I have used rsync, and it is great, but I want to be able to make changes on both ends, and have the changes propagated to both ends.


from the unison website:

What are the differences between Unison and rsync?
Rsync is a mirroring tool; Unison is a synchronizer. That is, rsync needs to be told ``this replica contains the true versions of all the files; please make the other replica look exactly the same.'' Unison is capable of recognizing updates in both replicas and deciding which way they should be propagated.
Both Unison and rsync use the so-called ``rsync algorithm,'' by Andrew Tridgell and Paul Mackerras, for performing updates. This algorithm streamlines updates in small parts of large files by transferring only the parts that have changed.

Anyway, I agree with the idea, "if it ain't broke, don't fix it" but that doesn't mean that there may be a better way out there, and that is why many of us are here on the forums for; to find out options and see if any of them might be better for us.

how many files/MB are you syncing? my main concern is for a fast sycn when there are NO changes (i.e. most of the time)

Originally Posted by zPilott

I'm not saying that it can't work, what I am saying is that rsync compares A and B and fixes up B to look like A.

I am personally interested in unison, because I have used rsync, and it is great, but I want to be able to make changes on both ends, and have the changes propagated to both ends.


from the unison website:

Anyway, I agree with the idea, "if it ain't broke, don't fix it" but that doesn't mean that there may be a better way out there, and that is why many of us are here on the forums for; to find out options and see if any of them might be better for us.

it's entirely possible to make changes on both ends and have rsync sync them up.

you just need to "pull" down the data from the server, once that is complete you'll have all the data the server had. then you run your client in push mode -- it will push up all the changes on the client. viola, sync.

rsync only deletes files that aren't on the server if you use the --delete option.

mark