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    SubjectRe: Building Big Ass Linux Machine, what are the limits?
    Stephen C. Tweedie wrote:
    > Hi,
    > On Thu, 1 Oct 1998 09:59:45 +0200 (MEST),
    > (Rogier Wolff) said:
    > > I've been thinking about this "change disk now" questions that the
    > > kernel might need to ask.
    > > I thought I'd make a character device that simply outputs the question
    > > to be posed to the user.

    > I'd love to know how this is supposed to work on a multi-user system
    > that has users logging in from a dozen different modems and X
    > terminals at the same time!

    My thought was that if you access the device, you should run the
    application that shows you the message. If you're accessing the
    multivolume device and forget to run the application, you're on your

    The person at the console is the one that most likely has physical
    access to the devices in question, so running the reporting program
    would for the "change disks" message be most appropriate for those
    sitting at the console.

    But if it's say a departemental server, all of the X sessions might
    want to include the "get messages program", allowing the person that's
    working on the volume to step up and walk over to the server to change

    > The kernel disk quota system also needs to be able to notify the current
    > user when quota is exceeded, and currently (in common with other Unixen)
    > we just output the message to the process's controlling tty device.
    > You'd need much more than just a single character device to deal with
    > this in any significantly better way.

    How about adding the uid of the user doing the access to the messages
    given through the character device. A sysop would run

    report_messages -all /dev/messages

    and get all "over-quota" and "please insert disk" messages. A user
    that doesn't want to be spammed by others doing stuff would do:

    report_messages /dev/messages

    to only get HIS OWN messages. (filtering outside of the kernel).


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