It's the backup program. I created the symlink
ln -s /dev/sg/c1b0t1u0 /dev/auto_changer0
and it stays UNTIL I run the backup program an then the link disappears.
As long as I tell the backup program to use /dev/sg2 for the changer
device everything works! I'll contact the backup people to see what
they are doing.
However, let me summarize my lack of knowledge here so I don't get too
far off track.
1. Don't mess with dev (don't create symlinks in it manually)
2. I THINK I use /etc/devfsd.conf to create the entries in /dev when
the device has an event happen to it?. So what I should do to create
the autochanger is go to /etc/devfsd.conf and put in something like the
CD line to create a symlink. I should have done that for the tape, too
but somehow it got created anyway. Is this correct - use
/etc/devfsd.conf for creating /dev entries.
3. What have I missed?
Thank you.
On Fri, 17 Jan 2003 09:47:31 +0300
Borzenkov Andrey <Andrey.Borzenkov@xxxxxxxxxxx> wrote:
> Sorry, cannot say anything. Strace your backup program, if this does
> not give any clue - run devfsd in debug mode to see if somebody
> removes this link.
>
> -andrey
>
> >
> > > Okay, I hit a problem.
> > >
> > > The /dev/tape0 symlink to my /dev/st/c1... works fine.
> > >
> > > However, if I create
> > >
> > > ln -s /dev/sg/c1b0t1u0 /dev/auto_changer0
> > >
> > > or
> > >
> > > ln -s /dev/sg2 /dev/auto_changer0
> > >
> > > and then run my tape program (supplied by the backup program
> > > vendor) I have problems.
> > >
> > > I create the link, use ls to show it's there, then run the program
> > > - I get an error "can't find /dev/auto_changer0". I ls /dev/auto*
> > > and/dev/auto_changer0 is not there!
> > >
>
> Is canonical name still there?
> /dev/scsi/host1/bus0/target1/lun0/generic. Is sg still loaded at this
> point?
>
> > > cat/proc/scsi/scsi shows it's there (the Spectra) as does dmesg
> > > (Attached scsi generic sg2 at scsi1, channel 0, id 1, lun 0, type
> > > 8)
> > >
> > > What's happening here? The symlinks for /dev/tape0 and
> > > /dev/tape0n don't disappear. Do I need to do something to the
> > > /etc/devfsd.conf or/etc/modules.conf files??
> > >
> > > Thank you.
> > >
> > >
> > > bash-2.05b$ cat /proc/scsi/scsi
> > > Attached devices:
> > > Host: scsi0 Channel: 00 Id: 00 Lun: 00
> > > Vendor: ADAPTEC Model: RAID-5 Rev: 370F
> > > Type: Direct-Access ANSI SCSI revision: 02
> > > Host: scsi1 Channel: 00 Id: 00 Lun: 00
> > > Vendor: EXABYTE Model: Mammoth2 Rev: v04b
> > > Type: Sequential-Access ANSI SCSI revision: 02
> > > Host: scsi1 Channel: 00 Id: 01 Lun: 00
> > > Vendor: SPECTRA Model: 215 Rev: 1008
> > > Type: Medium Changer ANSI SCSI revision: 02
> > > Host: scsi1 Channel: 00 Id: 04 Lun: 00
> > > Vendor: MATSHITA Model: DVD-RAM LF-D200 Rev: A120
> > > Type: CD-ROM ANSI SCSI revision: 04
> > >
> > > > *****
> > > > Here's the dmesg portion
> > > > st: Version 20020205, bufsize 32768, wrt 30720, max init. bufs
> > > > 4, s/g segs 16
> > > > Attached scsi tape st0 at scsi1, channel 0, id 0, lun 0
> > > > Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
> > > > SCSI device sda: 286744576 512-byte hdwr sectors (146813 MB)
> > > > Partition check:
> > > > /dev/scsi/host0/bus0/target0/lun0: p1 p2 p3 p4 < p5 p6 p7 p8 p9
> > > > p10
> > > > >
> > > > Attached scsi CD-ROM sr0 at scsi1, channel 0, id 4, lun 0
> > > > sr0: scsi3-mmc drive: 0x/0x dvd-ram cd/rw xa/form2 cdda tray
> > > > Attached scsi generic sg2 at scsi1, channel 0, id 1, lun 0,
> > > > type 8
> > >
>
--
Brett I. Holcomb
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