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What do the rmt0.#'s mean

Posted on 1998-12-01
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Last Modified: 2010-04-21
Can someone quickly define what each of the devices means?

/dev/rmt0
/dev/rmt0.1
/dev/rmt0.2
...
/dev/rmt0.7

Thanx
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Question by:aleyva
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by:aleyva
ID: 2008178
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procguy earned 100 total points
ID: 2008179
The /dev/rmt0.x   [x=0..255] is for use of removable tapes in raw mode (ie, not block mode like a hard drive).  You can use this driver in scripts via the rmt command, or use it in backup when using cpio (not tar).

The different numbers (the /dev/rmt0.1, rmt0.2) will correspond to different densities assigned to that number as well as what actions are performed (such as rewind-on-close, and re-tension-on-open)

The defautls will vary from UNIX to UNIX too.
The commands to change these parametes (and some UNIXes extend these further than others) will vary from UNIX to UNIX.
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Author Comment

by:aleyva
ID: 2008180
The answer I was looking for was more like
:
Special File Name  |Rewind-on-Close   |Retension-on-Open
/dev/rmt*                Yes                      No  
/dev/rmt*.1              No                       No  
/dev/rmt*.2             Yes                      Yes
/dev/rmt*.3              No                       Yes
/dev/rmt*.4             Yes                      No
/dev/rmt*.5              No                       No
/dev/rmt*.6             Yes                      Yes
/dev/rmt*.7              No                       Yes

Thanx and sorry it took so long to respond.
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