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Date:      Fri, 26 Jul 2013 09:56:05 -0700
From:      Dieter BSD <dieterbsd@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   disk is AWOL
Message-ID:  <CAA3ZYrCYhhabEU%2B2KgMKc4E1v-3-fa-z48JK2GpKrZDUHtrhwg@mail.gmail.com>

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8.2 amd64
ad8 is a 3TB Seagate on nforce4-ultra controller

At boot:
ad8: 2861588MB <ST3000DM001 9YN166 CC4B> at ata4-master UDMA100 SATA 3Gb/s
DEBUG g_part_gpt.c gpt_read_hdr() ad8 succeeded with pp->sectorsize=512

An hour later:
# dd if=/dev/ad8 bs=4k count=1 of=/dev/null
dd: /dev/ad8: No such file or directory

BUT: there was no "ad8: FAILURE - device detached" or similar message
on the console, in dmesg, or in /var/log/*.  The disk just disappeared
without a peep from the kernel. What's going on?



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