Hi Daniel,

No, not quite.

If you want a clean file system on the drive you are going to remove you must 
temporary stop BackupPC and unmount the file system first. When the drive is 
removed you can mount the file system again and start BackupPC. This will cause 
the RAID to run in degraded mode if you only have one disk left in the RAID, 
but 
will otherwise work as usual. (You don't have to run in degraded mode if you 
are 
rotating four disks in the scheme I proposed.) Stopping BackupPC and unmounting 
the file system can't be done by hotplug, because it is already too late.

You don't have to stop BackupPC when you attach a drive. Just plug it in and 
add 
it to the RAID with "mdadm --add", which you might be able to get hotplug to do 
for you.

Best regards,
/Martin Leben


Daniel Denson wrote:
> I think I understand your want in that you would like to have backuppc 
> check that a drive is hooked up before trying to use it for backups.  If 
> I am correct then I would suggest you build a quick daemon script that 
> starts backuppc when the device is hotplugged and stops backuppc when 
> unplugged.  I dont know what your linux distro is but hotplug scripts 
> are pretty easy, do some google work to get the file and method for a 
> hotplug script on a specific device.


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