/dev/tape

[Les Mikesell]

After installing FC5, I don't see /dev/tape showing up as a symlink
to /dev/nst0 anymore and it disappears after a reboot if I add one
manually to make mt and amanda work.  The tape drive wasn't attached
when I installed - would that make a difference?  
/etc/udev/rules.d/50-udev.rules does have an entry:
KERNEL=="nst[0-9]", BUS=="scsi",        SYMLINK+="tape-%k",
MODE="0660"
and I do have /dev/nst0.  Does it need something else?

-- 
 Les Mikesell
  lesmikesell(a)gmail.com

[Mikkel]

Les Mikesell wrote:
>  After installing FC5, I don't see /dev/tape showing up as a
> symlink
>  to /dev/nst0 anymore and it disappears after a reboot if I add one
>  manually to make mt and amanda work.  The tape drive wasn't attached
>  when I installed - would that make a difference?  
>  /etc/udev/rules.d/50-udev.rules does have an entry:
>  KERNEL=="nst[0-9]", BUS=="scsi",        SYMLINK+="tape-%k",
> MODE="0660"
>  and I do have /dev/nst0.  Does it need something else?
>   
Looking at this rule, you probably have something like /dev/tape-0
instead of /dev/tape. The %k is replaced with the kernel number, so
that /dev/nst0 gets a /dev/tape-0 symlink. /dev/nst1 would get
/dev/tape-1, and so forth.

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

[Les Mikesell]

On Thu, 2006-06-01 at 17:19 -0500, Mikkel L. Ellertson wrote:
>  Les Mikesell wrote:
>  > After installing FC5, I don't see /dev/tape showing up as a symlink
>  > to /dev/nst0 anymore and it disappears after a reboot if I add one
>  > manually to make mt and amanda work.  The tape drive wasn't attached
>  > when I installed - would that make a difference?  
>  > /etc/udev/rules.d/50-udev.rules does have an entry:
>  > KERNEL=="nst[0-9]", BUS=="scsi",       
> SYMLINK+="tape-%k", MODE="0660"
>  > and I do have /dev/nst0.  Does it need something else?
>  > 
>  Looking at this rule, you probably have something like /dev/tape-0
>  instead of /dev/tape. The %k is replaced with the kernel number, so
>  that /dev/nst0 gets a /dev/tape-0 symlink. /dev/nst1 would get
>  /dev/tape-1, and so forth. 
Actually it is making tape-nst0 -> nst0, but that doesn't help
much.

-- 
   Les Mikesell
   lesmikesell(a)gmail.com

[Rick Stevens]

On Thu, 2006-06-01 at 17:31 -0500, Les Mikesell wrote:
>  On Thu, 2006-06-01 at 17:19 -0500, Mikkel L. Ellertson wrote:
>  > Les Mikesell wrote:
>  > > After installing FC5, I don't see /dev/tape showing up as a symlink
>  > > to /dev/nst0 anymore and it disappears after a reboot if I add one
>  > > manually to make mt and amanda work.  The tape drive wasn't attached
>  > > when I installed - would that make a difference?  
>  > > /etc/udev/rules.d/50-udev.rules does have an entry:
>  > > KERNEL=="nst[0-9]", BUS=="scsi",       
> SYMLINK+="tape-%k", MODE="0660"
>  > > and I do have /dev/nst0.  Does it need something else?
>  > > 
>  > Looking at this rule, you probably have something like /dev/tape-0
>  > instead of /dev/tape. The %k is replaced with the kernel number, so
>  > that /dev/nst0 gets a /dev/tape-0 symlink. /dev/nst1 would get
>  > /dev/tape-1, and so forth.
>  
>  Actually it is making tape-nst0 -> nst0, but that doesn't help
>  much. 
Change the rule to:

	KERNEL=="nst[0-9]", BUS=="scsi", SYMLINK="tape%k",
MODE="0660"

and I'll bet it works.

----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens(a)vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-     Veni, Vidi, VISA:  I came, I saw, I did a little shopping.     -
----------------------------------------------------------------------

[Mikkel]

Les Mikesell wrote:
>  On Thu, 2006-06-01 at 17:19 -0500, Mikkel L. Ellertson wrote:
> > Les Mikesell wrote:
> >> After installing FC5, I don't see /dev/tape showing up as a symlink
> >> to /dev/nst0 anymore and it disappears after a reboot if I add one
> >> manually to make mt and amanda work.  The tape drive wasn't attached
> >> when I installed - would that make a difference?  
> >> /etc/udev/rules.d/50-udev.rules does have an entry:
> >> KERNEL=="nst[0-9]", BUS=="scsi",       
> SYMLINK+="tape-%k", MODE="0660"
> >> and I do have /dev/nst0.  Does it need something else?
> >>
> > Looking at this rule, you probably have something like /dev/tape-0
> > instead of /dev/tape. The %k is replaced with the kernel number, so
> > that /dev/nst0 gets a /dev/tape-0 symlink. /dev/nst1 would get
> > /dev/tape-1, and so forth.
>  
>  Actually it is making tape-nst0 -> nst0, but that doesn't help
>  much.
>   
Oops - you are correct. %k is kernel name, and %n is number. In any
case, if you are only using one tape device, you could create a rule
 to give you /dev/tape and /dev/ntape. What I would do is create a
file in /etc/udev/rules.d called 15-local.rules and put in two lines:

KERNEL=="nst0", BUS=="scsi", SYMLINK+="ntape",
MODE="0660"
KERNEL=="st0", BUS=="scsi", SYMLINK+="tape",
MODE="0660"

At least, I normally use tape for the rewinding device and ntape for
the non-rewinding device. The name used is not critical as long as
your rules come before the default rules listed above.

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!