Re: how do you tell the dump command not to rewind the tape

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> On solaris you just write to a different /dev device and dump will append 
> to the end of the last written file.

The norewind device name will be the same as the device you're
currently writing to with an n in front.  e.g. /dev/nst0

> If 0 is a full dump and 1 - 9 are incremental dumps, what's the difference 
> between the different levels?

Each level backs up data changed since the previous dump at a lower
level.  If you only use two levels there's no difference.  0 followed
by 2 is the same as 0 followed by 1.

There is a difference if you use multiple levels:

   0  backs up everything
   1  backs up everything changed since the last level 0
   2  backs up everything since the last level 1 
   and so on ...

You should know that use of dump under Linux is deprecated and not
guaranteed to work reliably.  See:

   http://lwn.net/2001/0503/a/lt-dump.php3

-- 
Ian



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