[linux-lvm] mirror legs order and priority (2)

Jonathan Brassow jbrassow at redhat.com
Mon Sep 29 14:28:09 UTC 2008

When you 'down-convert' a mirror, you should be able to specify which  
leg you want pulled.

# Change 2-way mirror to linear - specifying the device to be removed
prompt> lvconvert -m0 vg/lv /dev/sdb


On Sep 26, 2008, at 9:29 AM, daniele wrote:

> Greetings everyone,
> I have recently changed one of the mirrored-legs-hard-drives and  
> substituted it with a faster, bigger HD.
> Now does it matter which leg is the first one?
> I mean the home_mimage_0, right now is not on the fastest, and  
> newer(thus more reliable), hard drive. Does it matter? If so, is  
> there a way to quick switch it?
> Anyway when I added the new HD to the mirror-legs, the first leg was  
> chosen to be on an old disk regardless of the order in which I  
> provided "/dev/mirror_disk1   /dev/mirror_disk2   /dev/mirror_log"  
> to lvcovert -m1.
> Also when I do lvconvert a mirrored LV to an m0 linear one, how can  
> I choose which of the legs has to become the linear LV? So far it  
> seems that with "lvconvert -m0 vg00/home" the 'first' leg, is  
> automatically chosen to be the one(which is home_mimage_0). (That  
> might not be what one wants at times, and pvmoving the linear LV  
> after the lvconversion would be really a waste of resources and disk  
> efforts).
> Thanks for any help or info on all this,
> Best regards, Daniele.
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