zfs snapshot sort by size

When you see your zpool exploding, but the “used” size isn’t that much, you may take a look at your snaphosts.

First find the dataset with the that has the largest snapshot

zfs list -o name,usedbysnapshots | sort -r -k2

example output

tank/mails                                  56.3G
tank/store                                   261M
tank/docker                                 2.38M

In this case the tank/mails dataset should be looked at.

Snapshots can then be listed for that filesystem by using a command

# zfs list -t snapshot -r 
zfs list -t snapshot -r tank/mails 

ZFS rename disk path

zpool status
  pool: tank
 state: ONLINE

        NAME                                          STATE     READ WRITE CKSUM
        tank                                          ONLINE       0     0     0
          mirror-0                                    ONLINE       0     0     0
            usb-SanDisk_SDSSDA-1T00_0123456789CA-0:0  ONLINE       0     0     0
            da3p4                                     ONLINE       0     0     0

errors: No known data errors
zpool set path=/dev/disk-by-id/sdsdsdsd tank da3p4
zpool set path=/dev/gpt/my_nice_name  

just type `zpool import` and you will see the name that you can import.

if you want to change the mount path use

zpool import -R /other/path poolname

to rename the pool use

zpool import original_name new_name

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