RAIDZ2 [FreeBSD WIKI]

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====== Installing FreeBSD Root on ZFS (RAIDZ2) using GPT ======

===== Creating a bootable ZFS Filesystem =====

  - Boot %%FreeBSD%% install DVD or USB Memstick

  - Choose Fixit option in sysinstall

  - Create GPT Disks

<code>
Fixit# gpart create -s gpt ad0
Fixit# gpart create -s gpt ad1
Fixit# gpart create -s gpt ad2
</code>

  - Create the boot, swap and zfs partitions

Create 3 partitions on drives ad0, ad1 and ad2.  The first partition contains the gptzfsboot loader which is able to recognize and load the loader from a [[/ZFS]] partition. The second partition is a 4 GB swap partition. The third partition is the partition containing the zpool (60GB).

<code>
Fixit# gpart add -b 34 -s 128k -t freebsd-boot ad0
Fixit# gpart add -s 4G -t freebsd-swap -l swap0 ad0
Fixit# gpart add -s 60G -t freebsd-zfs -l disk0 ad0
</code>

<code>
Fixit# gpart add -b 34 -s 128k -t freebsd-boot ad1
Fixit# gpart add -s 4G -t freebsd-swap -l swap1 ad1
Fixit# gpart add -s 60G -t freebsd-zfs -l disk1 ad1
</code>

<code>
Fixit# gpart add -b 34 -s 128k -t freebsd-boot ad2
Fixit# gpart add -s 4G -t freebsd-swap -l swap2 ad2
Fixit# gpart add -s 60G -t freebsd-zfs -l disk2 ad2
</code>

<callout type="info">
**Note:**

  - While a [[/RootOnZFS#ZFS_Swap_Volume|ZFS Swap Volume]] can be used instead of the freebsd-swap partition, crash dumps can't be created on the ZFS Swap Volume.
  - Sizes and offsets are specified in sectors (1 sector is typically 512 bytes) but can also be specified in MB/GB by adding an 'M' or 'G' suffix.
</callout>

  - Install the Protective MBR (pmbr) and gptzfsboot loader to all three drives

<code>
Fixit# gpart bootcode -b /mnt2/boot/pmbr -p /mnt2/boot/gptzfsboot -i 1 ad0
Fixit# gpart bootcode -b /mnt2/boot/pmbr -p /mnt2/boot/gptzfsboot -i 1 ad1
Fixit# gpart bootcode -b /mnt2/boot/pmbr -p /mnt2/boot/gptzfsboot -i 1 ad2
</code>

This may fail with an "operation not permitted" error message, since the kernel likes to protect critical parts of the disk. If this happens for you, run:

<code>
Fixit# sysctl kern.geom.debugflags=0x10
</code>

  - Load ZFS kernel module

<code>
Fixit# kldload /mnt2/boot/kernel/opensolaris.ko
Fixit# kldload /mnt2/boot/kernel/zfs.ko
</code>

  - Create ZFS Pool zroot

<code>
Fixit# mkdir /boot/zfs
Fixit# zpool create zroot raidz2 /dev/gpt/disk0 /dev/gpt/disk1 /dev/gpt/disk2
Fixit# zpool set bootfs=zroot zroot
</code>

<callout type="info">
**Note:**

zroot is the name of the ZFS Pool, it could be anything (i.e. tank, data, ...)
</callout>

===== Installing FreeBSD to the ZFS filesystem =====
{{page>RootOnZFS/InstallingFreeBSD&nofooter&noeditbtn}}

===== Finish install =====

  - Create /etc/fstab

<code>
Fixit# cat << EOF > /zroot/etc/fstab
# Device			Mountpoint		FStype	Options		Dump	Pass#
/dev/gpt/swap0			none			swap	sw		0	0
/dev/gpt/swap1			none			swap	sw		0	0
/dev/gpt/swap2			none			swap	sw		0	0
EOF
</code>

  - export LD_LIBRARY_PATH 

<code>
Fixit# export LD_LIBRARY_PATH=/mnt2/lib 
</code>

  - Unmount all zfs filesystems

<code>
Fixit# zfs unmount -a
</code>

  - Change mount points for zroot pool 

<code>
Fixit# zfs set mountpoint=legacy zroot
Fixit# zfs set mountpoint=/tmp zroot/tmp
Fixit# zfs set mountpoint=/usr zroot/usr
Fixit# zfs set mountpoint=/var zroot/var
</code>

  - Exit Fixit mode, and then sysinstall.  Remove the %%FreeBSD%% install DVD/Memstick and the system will boot using the ZFS root.