Linux question
 

Hi!

I have been using Linux for about 10 years and have found almost all answers to my problems via the web or just plain messing around until it works. Now I am stuck. I need to be able to plug and unplug two USB hard drives. The catch is that they are used for backing up and need to be swapped out each day. I have done this before without problem, but twice now (two different computers) the drives get assigned /dev/sdb and /dev/sdc. The backup program flips out cause it is expecting both drives to be /dev/sdb. How can I change the drive number? Someone mentioned using udev, but I can not figure out what to do. Any help would be greatly appreciated!

Thanks!!! SmileWavy

Dave

EDIT: autofs is coded to use /dev/sdb. I can't go in on a daily basis and change the config file for autofs.

grep the dmesg output to see what device it is assigned to, then mount it appropriately.
gives it to me on my home debian box... of course, you'd want toa adjust the grep for a different key or improve it to a regular expression to make sure you are getting the right thing to mount. Maybe.

So tell autofs to ignore it, and write a wrapper script to handle the mounting and just call the wrapper at the start of your backup script.

I am actually using a backup program - Yosemite Backup. No backup script. Not sure if I could tell YB to run a script before and after. I will look into that. Finding the scsi/usb drive is not an issue.

This has worked before. I had two identical WD usb drives and things worked well until we noticed that one had a very slow throughput. It was RMA'd and the one that came back has a different model number even though they look the same and have the same capacity.

Dave