Don't back up directly to the mountpoint. Backup to a directory on the
filesystem that you mount. That way, if the filesystem is not mounted
the directory your backup software is looking for will not exist.
For example,
1) Have a 'backup' directory on the filesystem on the external disk
2) Mount the external disk on '/mnt/foo'
3) Backup to '/mnt/foo/backup'
This is a good approach to use for other software as well, like database
servers.
On 10/24/2014 01:41 PM, Tilghman Lesher wrote:
I have an issue for which I haven't been able to come up with a good
solution. We have a backup solution whereby multiple disks, attached
via USB, are used for backups. Normally, those disks are mounted
automatically with udev, so backups can proceed normally. The problem
comes in when the disks are not attached, and the backup process runs,
writing to the same directory, which fills up the root disk.
What I'd like to have is the ability to designate specific directories
as mount-only and deny all writes to those directories, if the disk
normally mounted there is missing. Any ideas on how to do something
like this? Currently, we're using the workaround of removing the
mount point when the disk is unmounted, but that tends to be fragile,
as we've already found out (where a directory didn't get removed and
the root disk was filled).
--
All the best,
Brian Pitts
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