On Tue, 14 Jan 2003 10:29:05 -0700 Andrew Mathews <[EMAIL PROTECTED]> wrote:
This is a devfs system and st does not exist. If I trace the /proc/scsi/scsi output back using the host luns and targets it goes to sg1. devfs sees it as sg. The tape is id 0 on the card, the changer id 1 according to the card's output when it boots and that matches the scsi output (host 1, id 0 and 1). lr-xr-xr-x 1 root root 36 Jan 14 10:01 /dev/sg1 -> scsi/host1/bus0/target0/lun0/generic /dev/sg: total 0 lr-xr-xr-x 1 root root 39 Jan 14 10:01 c0b0t0u0 -> ../scsi/host0/bus0/target0/lun0/generic lr-xr-xr-x 1 root root 39 Jan 14 10:01 c1b0t0u0 -> ../scsi/host1/bus0/target0/lun0/generic lr-xr-xr-x 1 root root 39 Jan 14 10:01 c1b0t1u0 -> ../scsi/host1/bus0/target1/lun0/generic lr-xr-xr-x 1 root root 39 Jan 14 10:01 c1b0t4u0 -> ../scsi/host1/bus0/target4/lun0/generic > Brett I. Holcomb wrote: > > I have a Cybernetics tape library (SCSI) with tape drive (also SCSI). I'm >attempting to test it with simple commands like tar -cvf /dev/tape0 /somedir. This >gives a list of files ,then "write 0 of 1024 blocks, error not recoverable" > > > > If i use mt -f /dev/tape0 status I get "operation not permitted). > > > > The tape device (see cat /proc/scsi/scsi below) is id 0 on host 1 while the >library is ID 1 on host 1. The /dev/sg1 is linked (by gentoo) to the /scsi device so >I created a link /dev/tape0 to /dev/sg1. > > BZZT! Remove this and link it to /dev/st0 not sg0. > > > > > lr-xr-xr-x 1 root root 36 Jan 14 10:01 /dev/sg1 >->scsi/host1/bus0/target0/lun0/generic > > > > Why does mt tell me the operation is not allowed? The /scsi entries have the >correct permissions. I'm doing this as root - any ideas? > > This system is using the devfs file system. > > > <snip> > Because you can't get the status of the changer, (sg0) you can only get > the status of the drive (st0). Remember that with a library, you'll have > 2 devices, the tape drive (st0) and the changer (sg0). I wrote a backup > script for an ADIC 7 tape DLT library that uses tape 1 for Sunday, tape > 2 for Monday, etc. if you'd like. (it uses xfsdump, you'll need to > modify it for tar, cpio, or dump) > > -- > Andrew Mathews > --------------------------------------------------------------------- > 10:22am up 16 days, 13:20, 9 users, load average: 1.05, 1.02, 1.00 > --------------------------------------------------------------------- > Bachelor: > A man who chases women and never Mrs. one. > _______________________________________________ Linux-users mailing list [EMAIL PROTECTED] Unsubscribe/Suspend/Etc -> http://www.linux-sxs.org/mailman/listinfo/linux-users
