My tips about ata/ahci/zpool/zfs

ATA & AHCI

1. Use AHCI and NCQ

In your kernel configuration file add this then rebuild kernel:

device ahci

In /boot/loader.conf, add:

ahci_loader="YES"

2. Use camcontrol (8) instead of atacontrol (8)

atacontrol cap device

now:

camcontrol identify device

zpool

1. Create a RAID-Z Storage Pool

zpool create tankz raidz ada1 ada2 ada3

2. Destroy a ZFS Storage Pool

zpool destroy tankz

3. Create a Mirrored Storage Pool

zpool create tank mirror ada4 ada5

4. List Storage Pools

zpool list

5. Export/Import a ZFS Storage Pool

zpool export tank
zpool import tank

6. Add Cache Devices to a ZFS Storage Pool

zpool add tank cache ada6 ada7

7. Replace Device with Another Device in the Same Location

zpool offline tank ada3
zpool replace tank ada3

8. Replace Device with Another Device in the Different Location

zpool replace tank ada4 ada8

zfs

1. Create a ZFS Mount Point

zfs create tank/foo
zfs set mountpoint=/home/share/foo tank/foo

2. Create a ZFS Snapshot

zfs snapshot tank/foo@day1

3. Enable/Disable ZFS Compression

zfs set compression=off tank/foo
zfs set compression=on tank/foo

4. Restore Tuneables to Default

zfs inherit <property>=<value> <dataset>

References

1. Freebsd Handbook: ZFS
2. zfs (8)
3. zpool (8)
4. ata (4)
5. ahci (4)