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Date: Wed, 24 Feb 2010 10:55:30 -0800
From: malahal@us.ibm.com
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Subject: Re: [linux-lvm] Mirror fail/recover test
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To: linux-lvm@redhat.com

jose nuno neto [jose.neto@liber4e.com] wrote:
> Hi
> 
> I'm trying to test the failure of a SAN Mirrored Lv, and the recover and
> check for data lost.
> 
> Im runing RedHat 5.4
> 2.6.18-164.2.1.el5
> lvm2-2.02.46-8.el5_4.1
> 
> I create a 2mirror+log lv ok, can lvconvert to one leg only, can delete ok.
> But when I simulate a disk fail either with
> dd if=/dev/zero of=pvmirror_device
> echo offline > /sys/block/pvmirror_device/device/status

What is the output of "dmsetup status" at this point?
There must be some messages in the /var/log/messages file if you enable
them.

> lvs -a -o +devices
> stills shows the lv has mirrored ( should switch to non-mirrored right?) ,

Yes, provided you successfully started the dmeventd monitoring thread
and it handled the failure event.

Thanks, Malahal.