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 <[EMAIL PROTECTED]> wrote:
On Tue, Mar 06, 2007 at 04:09:42PM -0500, FL wrote:
> On 2/22/07, Stefan G. Weichinger <[EMAIL PROTECTED]> 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.
[EMAIL PROTECTED] /]# 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 [EMAIL PROTECTED]
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
