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



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?


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