My tips about ata/ahci/zpool/zfs

ATA & AHCI

1. Use AHCI and NCQ

In your kernel configuration file add this then rebuild kernel:

1	device ahci

In /boot/loader.conf, add:

1	ahci_loader="YES"

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

1	atacontrol cap device

now:

1	camcontrol identify device

zpool

1. Create a RAID-Z Storage Pool

1	zpool create tankz raidz ada1 ada2 ada3

2. Destroy a ZFS Storage Pool

1	zpool destroy tankz

3. Create a Mirrored Storage Pool

1	zpool create tank mirror ada4 ada5

4. List Storage Pools

1	zpool list

5. Export/Import a ZFS Storage Pool

1 2	zpool export tank zpool import tank

6. Add Cache Devices to a ZFS Storage Pool

1	zpool add tank cache ada6 ada7

7. Replace Device with Another Device in the Same Location

1 2	zpool offline tank ada3 zpool replace tank ada3

8. Replace Device with Another Device in the Different Location

1	zpool replace tank ada4 ada8

zfs

1. Create a ZFS Mount Point

1 2	zfs create tank/foo zfs set mountpoint=/home/share/foo tank/foo

2. Create a ZFS Snapshot

1	zfs snapshot tank/foo@day1

3. Enable/Disable ZFS Compression

1 2	zfs set compression=off tank/foo zfs set compression=on tank/foo

4. Restore Tuneables to Default

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

References

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