Re: [SLE] Backups

From: Michael W Cocke (cocke_at_catherders.com)
Date: 07/12/04

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    To: suse-linux-e@suse.com
Date: Sun, 11 Jul 2004 20:26:05 -0400

    On Sun, 11 Jul 2004 19:58:40 -0400, you wrote:

    >On Sunday 11 July 2004 05:38 pm, Michael W Cocke wrote:
    >> 1) I didn't have anything to do with the writing of DAR.  I wrote the
    >> optional add-on named DARomizer, which allows burning media in
    >> parallel with the creation of the creation of the archives.
    >
    >I've been looking at DAR all day... and think it looks pretty good.
    >
    >But I have not come across just how one would point it to a DVD-RW to burn the
    >disk on the fly.... It that possible? Or do you need to create a file first
    >and then write it to a dvd....
    >

    I'm not sure I understand the question... Let me explain what DAR
    does and you can ask additional questions as necessary.

    DAR creates what are called 'slice' files. Each slice is sized to the
    media you're trying to back up to. For example, say I want to back up
    40 Gb of data to DVDs. A DVD holds 4 GB, so I'll need 10 DVDs. DAR
    will create a 4GB 'slice' of the total archive, then burn it to dvd,
    then create the next 4Gb slice and burn it, and so on.

    DAR doesn't do the burning itself - exactly what happens is this - you
    start DAR. It creates a slice in /tmp (or wherever you told it to
    use), then DAR calls cdrecord (or whatever burning program you tell it
    to use). The slice is burned, optionally verified, optionally
    deleted, then the next slice is created.

    If you choose to use DARomizer with DAR, then as one slice is being
    burned and optionally verified, the next slice is being created. It
    requires more /tmp space, but greatly reduces the time required for
    each slice to be created then burned.

    If you're asking if it has to create the entire archive, THEN split it
    up and burn it, no - it burns each chunk as it's created, whether you
    use DARomizer or not.

    Did that help?

    Mike- 

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