From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Alan D. Brunelle" <Alan.Brunelle@hp.com>
Subject: Re: Constructing RAID 1+0 w/ LVM2/DM
Date: Thu, 24 Jan 2008 09:41:18 -0500
Message-ID: <4798A38E.2050206@hp.com>
References: <47989DA2.1070201@hp.com>
	<20080124143540.GZ8075@agk.fab.redhat.com>
Reply-To: device-mapper development <dm-devel@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <dm-devel-bounces@redhat.com>
In-Reply-To: <20080124143540.GZ8075@agk.fab.redhat.com>
List-Unsubscribe: <https://www.redhat.com/mailman/listinfo/dm-devel>,
	<mailto:dm-devel-request@redhat.com?subject=unsubscribe>
List-Archive: <https://www.redhat.com/archives/dm-devel>
List-Post: <mailto:dm-devel@redhat.com>
List-Help: <mailto:dm-devel-request@redhat.com?subject=help>
List-Subscribe: <https://www.redhat.com/mailman/listinfo/dm-devel>,
	<mailto:dm-devel-request@redhat.com?subject=subscribe>
Sender: dm-devel-bounces@redhat.com
Errors-To: dm-devel-bounces@redhat.com
To: device-mapper development <dm-devel@redhat.com>
List-Id: dm-devel.ids

Alasdair G Kergon wrote:
> On Thu, Jan 24, 2008 at 09:16:02AM -0500, Alan D. Brunelle wrote:
>>        /dev/dm-2: Skipping: Suspended dm device
>
> That code was never completed.  It applies a stronger test than
> necessary and assumes no mirrors are safe to use, even though some
> would be.
>
> Alasdair
So, does that mean that one can not construct a RAID 1+0 device using 
LVM2/DM in such a manner? Is there some way to override this behavior? 
Is it the 'ignore_suspended_devices() or !device_is_usable() call in the 
following causing the problem:

        /* Skip suspended devices */
        if (MAJOR(dev->dev) == _device_mapper_major &&
            ignore_suspended_devices() && !device_is_usable(dev->dev)) {
                log_debug("%s: Skipping: Suspended dm device", name);
                return 0;
        }

Thanks for the answer though...
Alan