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John Huttley wrote:
> Hi folks,
> I'm trying to get my head around the details of tape devices, as in
> /dev/st0.
> I had thought that for each physical device, two nodes were created
> /dev/st0 and /dev/nst0.
> The latter does not rewind when closed, thats the one used with bacula.
>
> Untrue! its creates 8 modes. For each on st and nst, there are {a,l,m}
> suffixes. These are "scsi modes".
>
> Its documented that these have their own minor device numbers, but I
> haven't found anything that explains the significance.
There's no real significance... nothing is mode 0, the default settings,
l is mode 1, m is mode 2 and a is mode 3. For some drives this allows
you to set the compression ratio (mode 1 being the lowest, mode 3 the
highest) some others use it for density settings etc etc but usually
it's not supported and unused.
Greetings,
Michel
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