[zfs-discuss] convert LVM to ZFS

Manuel Amador (Rudd-O) rudd-o at rudd-o.com
Thu Jul 28 21:37:17 EDT 2011


You could do striping... but say bye to the reliability.


On Thu, 2011-07-28 at 20:58 -0400, Outback Dingo wrote:
> On Thu, Jul 28, 2011 at 8:44 PM, Christ Schlacta <aarcane at aarcane.org>
> wrote:
>         
>         On 7/28/2011 15:38, Dingo wrote:
>                 ive installed zfs on a Oneric 11.10 kubuntu desktop,
>                 it currently uses
>                 lvm with 2 drives being 1 500GB drives and 1 750GB
>                 drive creating a
>                 root / of 1.2T
>                 df -h
>                 /dev/mapper/G53SW-root 1.2T   74G 1007G   7% /
>                 
>                 its currently under LVM / ext4.... how would i convert
>                 it to be ZFS
>                 for the same result.... and could it be encrypted?
>         You would have to shrink the LV to exist on only one of those
>         drives, then remove the other drive from the VG.  the command
>         you want to do this is vgreduce.  Once the drive is removed,
>         you create a zpool on that drive, then you migrate your data
>         (tar, cp, rsync, etc.) then you destroy your volume group and
>         add the remaining device to the new zpool.  zpool only works
>         on mirror, not on stripe, so you'll end up with a volume of
>         500GB with raid1 reliability.
> 
> 
> Darn i was going for size..... Guess i could create two pools, one for
> OS/Applications/home the other for development stuff, though, even if
> i did mirror, wouldnt i be wasting 250GB as the first disk is only
> 500Gb
> and anyway to encrypt this such as you can with FreeBSD Geli..... ?
> Anything comparable in linux ?
>  
>         to do the migration, you should follow the zfsroot install
>         guides, but substitute debootstrap with rsync/cp/tar and
>         everything else should just about work.  you don't need the
>         livecd, you should be able to do the work from your existing
>         OS (but using the livecd might make the process a bit easier
>         if you're inexperienced with linux)
> 




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