I'm having repeated problems with my tape changer and the sg device. I'm running a Dell Powervault 120T (DLT7000 w/ 7 tape changer) on an adaptec (aic7xxx driver) card.
Every time I load a tape using mtx, subsequent calls to mtx report: cannot open SCSI device '/dev/sg0' - No such device or address /dev/sg0 still exists, but I can't seem to talk to the changer anymore. I can talk to the drive itself however. The only fix I've found for this is to rmmod all the scsi drivers (st,sr_mod,sg,aic7xxx) and then insmod them again. Anyone else have similar issues? This makes using amtape conf taper very difficult. Russell
