Increasing disk/zpool size of FreeBSDZFS disks in Linode

I’m running a FreeBSD instance in Linode. And FreeBSD is not the official supported OS in Linode.The disk type is set to raw to install FreeBSD.

And recently Linode upgraded my instance and the disk size is increased from 40G to 80G.

But when I login to the system, I found that my zpool is still 40G. But the disk is shown as 80G.

# gpart show
=>       34  100663229  ada0  GPT  (80G) [CORRUPT]
         34          6        - free -  (3.0K)
         40       1024     1  freebsd-boot  (512K)
       1064        984        - free -  (492K)
       2048    4194304     2  freebsd-swap  (2.0G)
    4196352   96464896     3  freebsd-zfs  (46G)
  100661248       2015        - free -  (1.0M)

I tried to enable zfs autoexpand on my zpool, the same. Then how to increase the disk/zpool size?

First, re-write disk metadata

# gpart recover ada0
ada0 recovered

After this, gpart can show the real disk space info

#:~ # gpart show
=>       40  167772080  ada0  GPT  (80G)
         40       1024     1  freebsd-boot  (512K)
       1064        984        - free -  (492K)
       2048    4194304     2  freebsd-swap  (2.0G)
    4196352   96464896     3  freebsd-zfs  (46G)
  100661248   67110872        - free -  (32G)

Then, expand zfs partition

# gpart resize -i 3 ada0
ada0p3 resized

Then, expand the zpool

zpool online -e zroot /dev/ada0p3

Done!

#:~ # df -h /
Filesystem            Size    Used   Avail Capacity  Mounted on
zroot/ROOT/default     74G     29G     45G    39%    /

Don’t forget to write zfs info to disk

gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ada0

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