On Saturday 21 June 2008 22:47:31 Roland Smith wrote: > On Sat, Jun 21, 2008 at 09:44:09PM +0000, Helge Rohde wrote: > > Hello List, > > > > I need to write a backup script, and one of the required actions would be > > a copy of the backup to an external firewire drive. I would like to make > > this as easy as possible for the local staff, so i'd like to check > > whether the drive is attached, if necessary mount it, copy over the > > backup and unmount it again, so that the local staff can swap the > > external disks when they're not used. > > > > Is there a canonical way to achieve what i want? I played with the idea > > of simply checking for /dev/da0s1d's existance, but that won't disappear > > on disconnect, so that would leave the is a possibility that although > > da0 is in /dev, it might not be connected. > > Use glabel(8) to give the device an unique label. There is no telling > which device /dev/da0s1d is pointing to! After labeling you can check > for /dev/<fstype>/<yourlabel>, which should be unique. > > Make sure to unmount the drive at the end of the backup script, or > you'll get a kernel panic when staff pulls the plug on a mounted device. > > Roland
Okay, it obviosly makes sense to use glabel instead of the device node. Will the glabel appear/disappear depending on whether the drive is connected? Is it possible to have more then one physical drive with the same glabel(As i plan to utilize two identical Firewire disks) ? Either way, i still need a way to check whether a drive is attached or not. Mounting( and unmounting!) will be done from the periodic backup scripts. I am not sure how devd could help me with that, besides maybe write/delete a zero-byte file somewhere and have the periodic script check for its existence. Thank you all for your help, Helge _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"