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Full Discussion: /dev/rmt/0cn
Top Forums UNIX for Dummies Questions & Answers /dev/rmt/0cn Post 10076 by Perderabo on Wednesday 7th of November 2001 11:12:39 AM
Old 11-07-2001
Most tape drivers these days will ignore your request to set the drive to the wrong density when reading. Instead, they sense the tape's density and will silently change the density to whatever is correct. But if you work on an old 9-track tape drive you may find that the driver has no easy way to sense density and the tape will seem to be unreadable.

Many people will dump several filesystems on the same tape by specifying the no rewind bit. After the first dump, the tape is left positioned ready to write a second dump. If you wanted to restore a file from that second dump, you would first need to "mt fsf" to get there. You better specify the no rewind when you do. Then for the restore, you could use an auto-rewind special file. I almost always will use the no-rewind option. I can always do an explicit rewind when I want.
 

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LEARN ABOUT OPENSOLARIS

mkdevmaps

mkdevmaps(1M)						  System Administration Commands					     mkdevmaps(1M)

NAME

       mkdevmaps - make device_maps entries

SYNOPSIS

       /usr/sbin/mkdevmaps

DESCRIPTION

       The  mkdevmaps  command	writes	to standard out a set of device_maps(4) entries describing the system's frame buffer, audio, and removable
       media devices.

       The mkdevmaps command is used by the init.d(4) scripts to create or update the /etc/security/device_maps file.

       Entries are generated based on the device special files found in /dev. For the different  categories  of  devices,  the	mkdevmaps  command
       checks for the following files under /dev:

	 audio		 /dev/audio, /dev/audioctl, /dev/sound/...
	 tape		 /dev/rst*, /dev/nrst*, /dev/rmt/...
	 floppy 	 /dev/diskette, /dev/fd*, /dev/rdiskette, /dev/rfd*
	 removable disk  /dev/dsk/c0t?d0s?, /dev/rdsk/c0t?d0s?
	 frame buffer	 /dev/fb

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Obsolete			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       allocate(1), bsmconv(1M), attributes(5)

NOTES

       mkdevmaps might not be supported in a future release of the Solaris operating system.

SunOS 5.11							    8 Oct 2003							     mkdevmaps(1M)
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