topic Re: Default tar device file in Operating System - HP-UX

Default tar device file

Roberto Volsa — Mon, 14 Mar 2005 06:05:50 GMT

Hello,
i would like to know how to change the default device used by tar command (2m instead of 0m).

Thanks in advance
BR

Re: Default tar device file

melvyn burnard — Mon, 14 Mar 2005 06:14:47 GMT

us the f option or key to supply the destination file, as in:

tar -f /dev/rmt/2m

Re: Default tar device file

Eric Antunes — Mon, 14 Mar 2005 06:30:01 GMT

Hi Roberto,

ioscan will tell you what you archive file you can use:

#ioscan -fnCtape

Best Regards,

Eric Antunes

Re: Default tar device file

Roberto Volsa — Mon, 14 Mar 2005 07:06:38 GMT

Hello,
my concern is avoiding adding "-f /dev/rmt/2m" ant each tar execution.

BR

Re: Default tar device file

Pete Randall — Mon, 14 Mar 2005 07:10:53 GMT

Do you have a device at 0m? If not, you could simply create a link from 0m to 2m. You could also create a new device file (see the attached method).

Pete

Re: Default tar device file

Eric Antunes — Mon, 14 Mar 2005 07:16:27 GMT

Hi,

By default, tar uses /dev/rmt/0m. So:

#tar cv

will use /dev/rmt/0m

Eric

Re: Default tar device file

Bill Hassell — Mon, 14 Mar 2005 08:32:43 GMT

There is no way to change tar's behavior. /dev/rmt/0m is hardcoded into the program. However, I would never run tar without explicitly using the full devicefile path (ie, -f option) simply because assuming defaults are always the same can cause lots of problems (such as overwriting the wrong tape). Similarly, linking device files can lead to mistakes when sysadmins forget or don't know about the link.

Re: Default tar device file

baiju_3 — Mon, 14 Mar 2005 11:54:46 GMT

Ya ,I understood your Q.

In HP 0m is the default.

In other Unix like SCO unix ,U can change the default tape drive in /etc/defalt/tar
file .

This way it will not work in HP.

what you can do is ,if there is no H/W available in 0m and 1m path remove the
device files by rmsf and do a reboot or rcreate the /dev/rmt/0m dev file with the major and monor number of /dev/rmt/2m file.

Or go for a reboot .

Should work ,
Thanks,
BL.

Re: Default tar device file

RolandH — Mon, 14 Mar 2005 19:35:16 GMT

Switch the tape device so the /dev/rmt/1m becomes /dev/rmt/0m and
the /dev/rmt/0m becomes /dev/rmt1m
--------------------------------------------------------
Run the following ioscan command to get the Hardware Path:
#ioscan -kf | grep -e INTERFACE -e DEVICE | grep -v target | awk '{printf "%s %
s %s\n",$3,$1,$2}'
8/0/0 tty 0
8/4 ext_bus 0
8/4.5.0 disk 0
8/4.7.0 ctl 0
8/4.8.0 disk 1
8/4.9.0 disk 2
8/4.10.0 disk 3
8/4.11.0 disk 4
8/4.12.0 disk 5
8/4.13.0 disk 6
8/4.14.0 disk 7
8/4.15.0 disk 8
8/16/0 ext_bus 2
8/16/1 pc 0
8/16/1.1 floppy 0
8/16/5 ext_bus 5
8/16/5.0.0 tape 0 <------ Here
8/16/5.2.0 disk 9
8/16/5.7.0 ctl 1
8/16/6 lan 0
8/16/7 ps2 0
8/20/2 tty 1
8/18/3.0.0 tape 1 <----- Here

#vi /tmp/infile
8/16/5.0.0 tape 1
8/18/3.0.0 tape 0

#ioinit -f /tmp/infile -r <----- This will cause a reboot

Note: Again, it might be necessary to remove the old device files with
the "rmsf" command and then re-create the device files with "insf -e".

Roland