Re: {bb} mounted file systems

[Charles Jones <jonescr@cisco.com>]

Doctor Khumalo wrote:

> I'm wondering if there is any way to monitor file systems that lose 
> their mount?  I have a system that rsyncs (using the delete option) 
> with another remote server. I've had it happen that the file system 
> lost its mount and overwote(i.e. deleted) the data on the remote 
> server. I need Big Brother to somehow alert me if the local server has 
> a file system that has lost its mount so that I can stop the rsync 
> before it deletes anything.
>
> Aside from using files.sh and putting a file on the filesystem and 
> checking that it exists, is there another way of doing this?

I use rsync in a similar fashion, and I use the --backup-dir option, so 
that any files that rsync deletes because it thinks they are gone from 
the remote get backed up to a backup directory.  Usually everything is 
fine and I prune the backup dir periodically, but there have been 
instances when rsync deleted everything because of a mount issue like 
you describe, and I was able to quickly recover the data from the backup 
directory. Also, rsync is not supposed to delete subdirs unless the dirs 
are empty, unless you use the --force option.

For a BB solution, sounds like you would want a client-side script that 
parses the output of either "df" or "mount" and send an alert if certain 
(any?) of the mounts were not there.  It should be fairly easy to create 
that, but I would still suggest using the --backup-dir option to rsync, 
as the BB alert wont help you if the mount goes away right before rsync 
runs and you are unable to respond in time.

-Charles
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