From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 16 Apr 2009 12:02:14 -0400
From: Takahiro Yasui <tyasui@redhat.com>
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Subject: Re: [linux-lvm] Simulating LVM Mirror Failure and recovery
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To: LVM general discussion and development <linux-lvm@redhat.com>

malahal@us.ibm.com wrote:
> I usually run "echo 1 > /sys/block/sda/device/delete" to make /dev/sda
> disappear and fail for LVM tests. You can fail the disk in a lot of ways
> depending on your hardware, but this trick works with almost every
> device!

# echo offline > /sys/block/sda/device/state

might work as well. In this case, you can recover the failure by

# echo running > /sys/block/sda/device/state

Thanks,
Taka