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The last person to maintain these Red Hat servers somehow set it up so they stay in sync -- if I delete files on one it automatically deletes them on the other. I need to set up a new configuration on just one of them, so I need to disable the synchronization, but I don't know what's causing it. Where should I look?

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The most obvious way, especially if the synchronization is instant, is that they may be using a network filesystem. Confirm that you're not looking at an NFS, AFS, etc. mount. /etc/fstab is a good place to start. An alternative is there may be a cluster filesystem running (once again, /etc/fstab is a good place to start).

Now, if its not instant (or even if it is, some of these programs are fairly quick), there are several tools that do this; possibly the most common is rsync. Usually that'd be run from a cron job somewhere, so check user and system crontabs. Normally, rsync is run in a master-slave setup, though, not multi-master. There are others, such as unison. Some run as daemons; check which processes are running (ps fxa for example). You can usually figure out what something is either with man or Google.

There are a bunch of commercial offerings, too. Looking at /usr/local, /opt, and installed packages may help here.

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There is no fstab on the server, I'm going to look at rsync I keep you informed. 1000 thanks –  user1040899 Dec 7 '11 at 3:59
    
@user1040899: There is no /etc/fstab‽ That's weird. FYI, that's a plain-text file, not a command to run... I'm guessing you know that, just want to be sure. Anyway, you can also see mounted filesystems by running mount or looking at /proc/mounts –  derobert Dec 7 '11 at 4:03
    
Oups I'm really a noob... there is fstab but not a folder... I find some informations in it I'll dig from here, thank you very much :-) –  user1040899 Dec 7 '11 at 4:13
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@user1040899: I'm not sure what these servers are, but I'd strongly recommend not learning Linux on a system where oops, I broke it would be a problem. And depending on how complicated this replication setup is, breaking the system might be easy to do by mistake. –  derobert Dec 7 '11 at 4:21
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If it's an NFS mount of the NAS server, then its not so much replicating as that the files are actually located on the NAS server. In the Windows world, it'd be a mapped network drive, if you're more familiar with that. /etc/fstab just says what to mount at boot—changing it won't do anything until the next boot. To change on the fly, use the mount and umount commands. You need to read up on Linux administration, its not going to be possible to cover it all in Unix.SE comments… –  derobert Dec 7 '11 at 5:05

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