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From: Paul B Mahol <onemda@gmail.com>
To: Peter Steele <psteele@maxiscale.com>
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Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: Re: USB disk boot issues
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On 4/1/10, Peter Steele <psteele@maxiscale.com> wrote:
> We clone systems from specially prepared USB flash sticks and this all works
> well, except that occasionally the flash stick fails to boot. It fails at
> the "mount root" step, saying that it cannot mount the specified root
> partition. We use a labeled partition on the disk to make it device
> independent, so we have something like
>
> /dev/label/usbroot  /    ufs    rw     1      1
>
> in our fstab. When it fails it doesn't recognize this device, and even ?
> doesn't list it as one of the available devices. If we reboot, it's likely
> the problem won't occur again. It seems to be some kind of timing issue. Is
> this a known problem?

Yes, it is.