ZFS Setup¶

apt install zfsutils-linux

Create Pool / Array¶

zpool create \
  -o ashift=12 \
  ${POOL} \
  raidz2 \
    /dev/disk/by-id/${DISK_1} \
    /dev/disk/by-id/${DISK_2} \
    /dev/disk/by-id/${DISK_3} \
    /dev/disk/by-id/${DISK_4} \
    /dev/disk/by-id/${DISK_5} \
    /dev/disk/by-id/${DISK_6}

# enable cache and intent log
zpool add ${POOL} cache -f ${DISK_CACHE}
zpool add ${POOL} log   -f ${DISK_LOG}

# set root options
zfs set compression=lz4 ${POOL}
zfs set exec=off ${POOL}

# setup ACLs for NFS clients
# see https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1779736
zfs set acltype=posixacl ${POOL}
zfs set xattr=sa ${POOL}

Regular Scrub¶

# monthly scrub - first sunday
  0  2  1-7  *   *    [ $(date +\%w) -eq 0 ] && zpool scrub ${POOL}

Swap on ZFS¶

zfs create \
  -V 32G \
  -b $(getconf PAGESIZE) \
  -o logbias=throughput \
  -o sync=always \
  -o compression=off \
  -o primarycache=metadata \
  -o secondarycache=none \
  ${POOL}/swap
mkswap -f /dev/zvol/${POOL}/swap
swapon /dev/zfol/${POOL}/swap --discard
cat <<EOF >>/etc/fstab
/dev/zvol/${POOL}/swap  none  swap  defaults,discard  0  0
EOF

Replace a Disk¶

zpool offline -t ${POOL} ${DISK_OLD}
zpool replace -f ${POOL} ${DISK_OLD} ${DISK_NEW}

Expand Device¶

zpool online -e ${POOL} ${DISK}

Import Pool From /dev/disk/by-id/*¶

# list
zpool import -d /dev/disk/by-id/

# import
zpool import -d /dev/disk/by-id/ ${POOL}