nocin.eu

Documentation: https://github.com/zfsonlinux/zfs/wiki/Admin-Documentation
Manual Pages: http://zfs.datto.com/man/
Milestones: https://github.com/zfsonlinux/zfs/milestones

modinfo zfs                               //check current ZFS version

zfs list                                  //list pool with datasets
zfs list -r pool                          //show all datasets in a pool with size and mountpoint
zfs list -r -o name,mountpoint,mounted    //check if datasets are mounted   

zpool status (pool)
zpool list
zpool list -v
zpool iostat (pool 1)
zpool iostat -v

Activate NFS on dataset:

zfs set sharenfs=on pool/dataset
zfs get sharenfs pool/dataset

Usefull comands when replacing a failed disk:

ls -l /dev/disk/by-id/                // Disk ID's
zdb                                   // Display zpool debugging and consistency information
smartctl -a /dev/ada0                 // S.M.A.R.T info
wipefs -a new_hdd                     // remove ext4 filesystem 
zpool replace data old_hdd new_hdd    // Replace HDD

Scrub cronjob:

cat /etc/cron.d/zfsutils-linux 

Add and remove Log & L2ARC:

zpool add data log sda1
zpool add data cache sda2

zpool remove data log sda1
zpool remove data cache sda2