Re: /dev/nst0

From: Paul Howarth (paul_at_city-fan.org)
Date: 02/16/05

  • Next message: Michael Scottaline: "Re: Linux Desktop for university staff" 
    Date: Wed, 16 Feb 2005 10:58:58 +0000
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Beast wrote:
    > stephan.helas@e-7.com wrote:
    >
    >> /dev/nst0 -> non rewinding tape device
    >> /dev/st0 -> rewinding tape device
    >>
    >> non rewinding means, that device does not automatic rewind after writing
    >> to tape.
    >
    >
    > It depends on tape driver, kernel or hardware? from where i should know
    > that my tape drive is support rewinding or not?

    All tape hardware supports rewinding; it wouldn't be much use without it.

    You choose for yourself whether to use a rewinding of non-rewinding
    device entry based on your application. Both devices are for the same
    hardware but they behave differently. If, for instance, you're just
    using tar to dump some files to a tape then you'd use the rewinding
    device so that the tape was rewound after having written the tape so
    that the tape would be ready to be read whenever you needed it. On the
    other hand, most higher-end backup applications write multiple files to
    the same tape, so you would use the non-rewinding tape device node (e.g.
    /dev/nst0) for that; if you used a rewinding device node then the tape
    would be rewound after writing each file to the tape and the next file
    would overwrite the one just written.

    Paul. 

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