Re: [linux-lvm] mirroring an LV?

[Georges Giralt <georges giralt free fr>]

malahal us ibm com a écrit :
> Mirror needs at least 3 PVs (2 for legs and 1 for dirty log) and you
> don't have 3 PVs in that volume group!
>
> --Malahal.
>
> Gordon McLellan [gordonthree gmail com] wrote:
> > I'm pulling my hair out trying to setup a mirrored logical volume.
> >
> > lvconvert tells me I don't have enough free space, even though I have
> > hundreds of gigabytes free on both physical volumes.
> >
> > Command: lvconvert -m1 /dev/vg1/iscsi_deeds_data
> > Insufficient suitable allocatable extents for logical volume : 10240
> > more required
> >
> > Any ideas?
> >
> > Thanks!,
> >
> > Gordon
> >
> > Here's the output from the lvconvert with verbose and debugging turned on:
> >
> > # lvconvert -vvv -d -m1 /dev/vg1/iscsi_deeds_data
........................snip.........................;;
Hi !
IMHO, you would be good when using soft mirror (md) to mirror your 2 PV 
and then make a vg on the md and then lv into it...
I use 3 disks to mirror my VG/LV and it is a waste. At next major system 
upgrade I'll convert it to MD/VG and reclaim a disk.
Hope this helps !

--
If the only tool you have is a hammer, you tend to see every problem as 
a nail.
                Abraham Maslow