[CentOS] lvconvert(split) - raid10 => raid0

Tue Oct 17 14:15:34 UTC 2017
Blake Hudson <blake at ispn.net>

Pulling (the correct) half of the HDDs would yield a degraded RAID10 
array which is essentially the same disk layout as a RAID 0 array. 
Unfortunately I have no experience with RAID level migration using LVM 
to tell you the correct commands to do so in a supported manner. When 
converting from RAID1 to RAID0, I believe you'd typically use lvconvert 
with the -m0 option. For example, the following command would remove sdc 
from lvol1:
     lvconvert -m0 vg/lvol1 /dev/sdc

Perhaps the command would be similar to break a RAID10 mirror(which is 
typically created using the -m1 option like a RAID1 array)? This RedHat 
page has some good info for RH7 LVM raid adminstration: 


lejeczek wrote on 10/17/2017 7:31 AM:
> hi guys, gals
> do you know if conversion from lvm's raid10 to raid0 is possible?
> I'm fiddling with --splitmirrors but it gets me nowhere.
> On "takeover" subject man pages says: "..between striped/raid0 and 
> raid10."" but no details, nowhere I could find documentation, nor a 
> howto.
> many thanks, L.
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos