Re: AMANDA reports no slots, but there ARE slots!

Unfortunately, my system doesn't have sg_scan (perhaps I could install this).
If my first reckless attempt to create a fixed device node for the changer isn't
wrong, I'm trying this, based on the output from udevinfo:

ID=="2:0:0:0", BUS=="scsi", SYSFS{vendor}=="EXABYTE ", NAME="changer", OWNER="root", GROUP="tape", MODE="0660"

the hope is that I could refer to /dev/changer in amanda.conf and not have to set
a symbolic link

The matching critera have to come from precisely one device section of the udevinfo output (no doubt I've missed some crucial point)...

On 3/6/07, Jon LaBadie <jon AT jgcomp DOT com> wrote:

On Tue, Mar 06, 2007 at 04:09:42PM -0500, FL wrote:
> On 2/22/07, Stefan G. Weichinger <sgw AT amanda DOT org> wrote:
> >
> After watching the trouble recur, I see that the device associated with the
> changer SCSI device ID moved: it was /dev/sg2, today it is /dev/sg1. No
> changes were made to the Exabyte LTO-2 tape library  or to the SCSI card (or
> anything else). So there is something I'm failing to understand about udev,
> SCSI or the Exabyte.
>
> Perhaps during bootup I should attempt
>
> mtx -f /dev/sg0 status
> mtx -f /dev/sg1 status
>
> until I have a valid status, and link
> /dev/changer to that, then refer to /dev/changer in amanda.conf. That's a
> workaround: somehow the device assigned to the changer moves on occasion,
> after a reboot. Perhaps I should be referring to the changer device in some
> other way (bus number, SCSI ID, lun...).

Does your system have sg_scan?  My FC4 does.  It would be a way of
enumerating your devices and possibly setting up udev rules to
create persistent names for the devices.

Here is a sample output on my system with a DDS3 drive + changer
id 5, lun 0+1, an LTO drive, and two usb disks.

[root@bigcow /]# sg_scan -i
/dev/sg0: scsi0 channel=0 id=5 lun=0
    HP        C1557A            U610 [rmb=1 cmdq=0 pqual=0 pdev=0x1]
/dev/sg1: scsi0 channel=0 id=5 lun=1
    HP        C1557A            U610 [rmb=1 cmdq=0 pqual=0 pdev=0x8]
/dev/sg2: scsi1 channel=0 id=4 lun=0
    HP        Ultrium 1-SCSI    E21V [rmb=1 cmdq=0 pqual=0 pdev=0x1]
/dev/sg3: scsi3 channel=0 id=0 lun=0 [em]
    ST330083  1A                3.03 [rmb=0 cmdq=0 pqual=0 pdev=0x0]
/dev/sg4: scsi4 channel=0 id=0 lun=0 [em]
    ST330063  1A                3.04 [rmb=0 cmdq=0 pqual=0 pdev=0x0]

--
Jon H. LaBadie                   jon AT jgcomp DOT com
JG Computing
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