Re: [linux-lvm] Will LVM2 ever be able to do striped mirrors "raid 10"?

[John Hughes <john Calva COM>]

malahal us ibm com wrote:
> John Hughes [john Calva COM] wrote:
>   
> > John Hughes wrote:
> >     
> > >                if (lp->stripes > 1) {
> > >                        log_error("mirrors and stripes are currently "
> > >                                  "incompatible");
> > >                        return 0;
> > >                }
> > >
> > > Should I just stick with mdadm for my mirroring and striping needs?
> > >       
>
> You can do it today with some hassle or wait until someone implements a
> feature called 'generic layering'. The feature really means, treat some
> LVs as PVs!
>
> How can you do raid10 today? Create two raid0 LVs. Lets us call these
> lvgroup0/lv0 and lvgroup0/lv1. Now create raid1 lv in lvgroup1 where
> lvgroup1's PVs are lvgroup0/lv0 and lvgroup0/lv1.
>
> Isn't that a rai10 volume?
>   
To increase the chances of surviving a double-disk failure it would be 
better to raid-0 a bunch of raid-1's.

Are we sure there are no deadlock problems with LVM2 layered on top of LVM2?