Disk extend

[Jan Bramkamp]

On 21/01/2017 16:01, Gokan Atmaca wrote:
> Hello
>
> I use KVM. I upgraded to a single disk that was owned by Freebsd with
> Qemu. But the disk "ROOT" is still small. What should I do for it ?
>
> root at test:~ # gpart show ada0
> => 34 83886013 ada0 GPT (40G)
> 34 1024 1 freebsd-boot (512K)
> 1058 39844864 2 freebsd-ufs (19G)
> 39845922 2097084 3 freebsd-swap (1.0G)
> 41943006 41943041 - free - (20G)
>
> I did so;
> root at test:~ # gpart resize -i 2 -s 20971520 ada0
> gpart: Device busy
>
> How can I do this safely?
You can't expand a partition unless there is free space directly behind 
it. In your case the swap partition is in the way. You can disable swap, 
delete the swap partition, resize the root partition to the right size 
(in your case 19GB+20GB = 29GB) leaving space for a new swap partition 
(in your case 1GB). It would look something like this:

# Disable swap
swapoff -a

# Delete the third partition
gpart delete -i 3                     ada0

# Resize the second partition now that there is adjacent free space
gpart resize -i 2 -s 29G              ada0

# Recreate the swap partition
gpart add    -t freebsd-swap -l swap0 ada0

# Enable swap
swapon -a

Now the UFS file system is smaller than the containing partition. Use 
growfs(8) to resize your file system.