Re: tape backup from remote

From: Bob Martin (bob_at_buckhorn.net)
Date: 03/29/04

  • Next message: Dan Vande More: "Re: tape backup from remote" 
    Date: Mon, 29 Mar 2004 15:47:38 -0600
To: Christoph Sold <cs@cheasy.de>

    Oddly, in the last 15 years or so, I've never had an issue with rdump
    and latency, even on the old 1.5m networks.
    IIRC, amanda uses dump too.....

    B

    Christoph Sold wrote:

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    > On Monday 29 March 2004 20:33, Sean Ellis wrote:
    >
    >>Hello,
    >
    >
    > G'day,
    >
    >
    >>I have a very general question about backing up to tape from a remote
    >>computer. The tape drive is unfamiliar territory for me, and I'm
    >>looking for recommendations for a sequence of steps to take.
    >
    >
    > Wise decision.
    >
    >
    >>Both machines are running fbsd 4.*, the local machine is a recent 4.9
    >>STABLE, and the tape drive is a Conner CTD800R-S. Will it be
    >>possible, or advisable, to use a utility to back up over the net
    >>directly to the tape, or should we be creating a local mirror and
    >>backing up this?
    >
    >
    > Backing up remotely can yield _very_ unsatisfying results for several
    > reasons:
    > - - If there is not enough bandwith, the tape "trashes": After backing up
    > a few blocks, the tape has to stop, rewind, then re-synchronize and
    > append to the previously written data. This is _much_ slower than
    > nominal backup speed.
    > - - If the network latency is too high, the backup software may get
    > confused and abort.
    > - - If the connection is dropped during backup, may tools invalidate the
    > whole backup.
    >
    > There are both commercial as well as open source tools dealing with this
    > situation. I used amanda (in the ports) to backup multiple remote
    > clients to one backup machine. Never experienced any data loss during
    > restore.
    >
    >
    >>I know that these are very basic questions, but I felt that posting
    >>here in isp might give me a more informed response.
    >
    >
    > Have a look at http://www.thestoragegroup.com/pubs.html , the links
    > there show many aspects of backup and recovery.
    >
    > Another hint, though: DDS (DAT) is not up to the job. I personally
    > ditched all DDS devices after multiple data loss events being caused by
    > worn tapes, never properly written tapes, over-aged tapes. Never
    > happend with DLT, though.
    >
    > HTH
    > - -Christoph Sold
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