<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body text="#000000" bgcolor="#FFFFFF"> My data is all currently kept on a server running Windows Storage Server 2012; The setup works well most of the time...sometimes I have to reboot my Xubuntu 12.04 system as the shared drives on the Windows machine will disapper from Xubuntul but it was infrequent enough that it didn't really disrupt my work. I've recently added another 2TB hard drive and it disappears more frequently than the other hard drives; I would say that it disappears every 45 minutes - 90 minutes. Sometimes I'm able to umount just that volume and then reconnect to it...but lately it's required a system reboot in order to reconnect to the share. Starting today: When I try to umount the drive from my ~/mounts directory it gives the following error message: umount2: Device or resource busy umount: /home/chrisf/mounts/backup_2: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) umount2: Device or resource busy I then have to issue the sudo umount -l <path to share> command in order to get it to un-mount. But afterwards I'm not able to reconnect to the drive - I'll issue the mount command and the terminal will just sit there on a new line with a blinking cursor and doesn't appear to be doing anything. I've tried leaving it for as long as I can but nothing ever happens. When I try to escape the process via a CTRL-C it doesn't give me a new line in which to issue commands.; I have to reboot the machine in order to get it to work and then it only stays up for the 45 - 90 minutes and the whole process starts all over again. I'm using fstab to automatically mount the drives when the system boots; the CIFS shares in the fstab file use a credentials file in order to connect to the drive as not using one was giving me problems when I first set this arrangement up about a year ago. In addition to recently adding this new 2TB HDD; I've also changed the password used to connect to the server. I changed the corresponding ~/.smbcredentials file and all of the other mounts seem to be functioning well; it's just this one hard drive that keeps giving me heartache. The only thing different about this hard drive is that it's connected to a PCI-e SATA controller card on the server; I have another hard drive that's connected to that SATA controller, but it's working just fine and doesn't drop. OH! I just remembered...before I added the 2TB drive that's been giving me so much heartache, the other 2TB hard drive that was on that SATA controller would occassionally give me problems - exhibiting nearly the same behavior as the aforementioned hard drive is...the only difference being that it wasn't as stubborn at being unmounted and remounted and didn't require me to reboot my Xubuntu machine as often. The random unmount only happens on my Xubuntu box, I've tested with a Windows 8.1 laptop, mounting the same shares (using the Map Network Drive function) and it stayed connected the entire time the laptop was up (which I left up over night)...so this seems to be a Xubuntu problem. Any help is appreciated. </body> </html>