# [OmniOS-discuss] sudden loss of networking

Michael Mounteney gate03 at landcroft.co.uk
Thu Jan 1 23:19:24 UTC 2015

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    Straight after the thermal diagnosis, a more definite culprit arose.
    Since April 2013 when the server was commissioned, it's had a
    three-way rpool mirror: two built-in SATA drives and one external
    'cigarette packet' USB-2 drive. I know, I know, not blistering
    data-centre performance but the idea is that if we go on holiday, or
    the house is burning down, I can grab the external drive and not lose
    all our data. This is a Supermicro SYS 5017C-LF so the drives are not
    removable or hot-swappable.

    Anyway, I'd been using the USB-2 drive elsewhere but this morning,
    when it was still quite cool, I plugged it in and re-attached it to the
    rpool mirror.  Within 1/2 hour the machine had locked-up again.  It
    would have performed only a few % of the resilvering.

    This comes into the category of 'wounded soldier' mentioned elsewhere
    in this list but I wonder if anyone can recommend what to do next.  The
    USB-2 drive had been used on a 'live' booted from a Bloody installation
    USB stick for about 36 hours without problems, so I don't understand
    why it should suddenly be causing the server to lock up, when it seems
    to behave properly elsewhere.

    The goal is to have an easily-removed mirror of the server, so maybe
    someone can suggest a better way.  USB-2 is obviously crippling the
    machines performance even when it's running properly.

    Thanks in expectation of any assistance and suggestions.

    Michael.

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