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    SubjectRe: NFS hang + umount -f: better behaviour requested.
    On Fri, 31 Aug 2007 16:06:36 +0800, Ian Kent said:
    > So, there's a power outage and the UPS had a glitch.

    Murphy can get a *lot* more creative than that.

    So we'd outgrown the capacity on our UPS and diesel generator, and decided
    to replace them. So we schedule downtime for a Saturday. Rather scary, we
    had a Sun E10K that had been powered-up for several years, and just as expected,
    a good fraction of the 400+ drives it had failed to re-spinup. While recovering
    from that, we discovered that although the vast majority of the 400 drives were
    either mirrors or raidsets, due to a config error, the boot volume wasn't
    mirrored (fortunately, it spun up OK so we dodged the bullet), so we fixed that.

    Literally the next Friday, not even a week later, a contractor relocating a
    door into our machine room shorted out a sensor circuit in our fire suppression
    system, triggering a Halon dump. Of course, no amount of UPS and diesel was
    going to save us now, because there was a safety interlock that killed the
    power feeds if the Halon dumped. This time, since they'd all been stressed
    just a week before, only 2 of the 400+ disks on the E10K failed to spin up.

    Guess which two. ;)

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