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Tape I/O - AIX

When the AIX kernel attempts to write to a tape device, is it possible to read what is being sent over the channel?...

  1. #1

    Default Tape I/O

    When the AIX kernel attempts to write to a tape device, is it possible
    to read what is being sent over the channel?
    Simon Fisher Guest

  2. #2

    Default Re: Tape I/O

    Simon Fisher wrote:
    > When the AIX kernel attempts to write to a tape device, is it possible
    > to read what is being sent over the channel?
    Hmm. Well, if it's not, the tape drive's gonna have a hard time doing
    its job.

    If you're talking about intercepting the outgoing data with a program
    on the box, yeah, that's doable. You'd need to be root to pull it off,
    though.

    Chris Mattern

    Chris Mattern Guest

  3. #3

    Default Re: Tape I/O

    Chris Mattern <syscjmgwu.edu> wrote in message news:<3F7C766B.3070507gwu.edu>...
    >
    > If you're talking about intercepting the outgoing data with a program
    > on the box, yeah, that's doable. You'd need to be root to pull it off,
    > though.
    >
    > Chris Mattern

    Hi. Root access isn't a problem...it's knowing how to intercept,
    redirect or read a log of the scsi commands sent to the drive that's
    the problem! Any tips on how to see or read this would be gratefully
    received. Thanks, Simon.
    Simon Fisher Guest

  4. #4

    Default Re: Tape I/O

    Simon Fisher wrote: 
    >
    >
    >
    > Hi. Root access isn't a problem...it's knowing how to intercept,
    > redirect or read a log of the scsi commands sent to the drive that's
    > the problem! Any tips on how to see or read this would be gratefully
    > received. Thanks, Simon.[/ref]

    You want to see the actual SCSI commands issued? Man, that's tougher
    than just seeing the data. It's certainly theoretically possible,
    but I'm not sure how you'd go about it without a thorough knowledge
    of the kernel I/O internals.

    Chris Mattern

    Chris Guest

  5. #5

    Default Re: Tape I/O

    Simon Fisher wrote:
     
    You can trace the fscsi system calls at the AIX side (before the data
    reaches the card), after that you may need loads of $$$$ for an FC data
    probe.

    --
    Doing AIX support was the most monty-pythonesque
    activity available at the time.
    Eagerly awaiting my thin chocolat mint.

    Jose Guest

  6. #6

    Default Re: Tape I/O

    Chris Mattern <edu> wrote in message news:<edu>... 
    > >
    > >
    > >
    > > Hi. Root access isn't a problem...it's knowing how to intercept,
    > > redirect or read a log of the scsi commands sent to the drive that's
    > > the problem! Any tips on how to see or read this would be gratefully
    > > received. Thanks, Simon.[/ref]
    >
    > You want to see the actual SCSI commands issued? Man, that's tougher
    > than just seeing the data. It's certainly theoretically possible,
    > but I'm not sure how you'd go about it without a thorough knowledge
    > of the kernel I/O internals.
    >
    > Chris Mattern[/ref]

    Does SCSI "broadcast" ? If so, then twin-tail a tape drive to 2
    separate hosts or adapters, then sniff on the other SCSI host/adapter.

    BV
    Bill Guest

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