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Re: [dm-devel] Constructing RAID 1+0 w/ LVM2/DM



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


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