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+---
+layout: wiki
+title: ZFS
+permalink: /wiki/ZFS/
+---
+
+ZFS in Qubes
+============
+
+**Use at your own risk**!
+
+Beware: Dragons might eat your precious data!
+
+Install ZFS in Dom0
+===================
+
+Install DKMS style packages for Fedora <sup>(defunct\\ in\\ 0.6.2\\ due\\ to\\ spl/issues/284)</sup>
+----------------------------------------------------------------------------------------------------
+
+Fetch and install repository for DKMS style packages for your Dom0 Fedora version [​http://zfsonlinux.org/fedora.html](http://zfsonlinux.org/fedora.html):
+
+``` {.wiki}
+disp1# wget http://archive.zfsonlinux.org/fedora/zfs-release-1-1$(rpm -E %dist).noarch.rpm
+dom0# qvm-run --pass-io disp1 'cat /home/user/zfs-release-1-1.fc18.noarch.rpm' > /home/user/zfs-release-1-1.fc18.noarch.rpm
+dom0# sudo yum localinstall /home/user/zfs-release-1-1.fc18.noarch.rpm
+dom0# sudo sed -i 's/$releasever/18/g' /etc/yum.repo.d/zfs.repo
+dom0# sudo qubes-dom0-update @development-tools
+dom0# sudo qubes-dom0-update zfs
+```
+
+Install DKMS style packages from git-repository
+-----------------------------------------------
+
+Build and install your DKMS or KMOD packages as described in [​http://zfsonlinux.org/generic-rpm.html](http://zfsonlinux.org/generic-rpm.html).
+
+### Prerequisites steps in AppVM <sup>(i.e.\\ disp1)</sup>
+
+Checkout repositories for SPL and ZFS:
+
+``` {.wiki}
+mkdir ~/repositories && cd ~/repositories
+git clone https://github.com/zfsonlinux/spl.git
+git clone https://github.com/zfsonlinux/zfs.git
+```
+
+Revert changes in SPL repository due to this bug: [​https://github.com/zfsonlinux/spl/issues/284](https://github.com/zfsonlinux/spl/issues/284)
+
+``` {.wiki}
+cd ~/repositories/spl
+git config --global user.email "user@example.com"
+git config --global user.name "user"
+git revert e3c4d44886a8564e84aa697477b0e37211d634cd
+```
+
+### Installation steps in Dom0
+
+Copy repositories over to Dom0:
+
+``` {.wiki}
+mkdir ~/repositories
+qvm-run --pass-io disp1 'tar -cf - -C ~/repositories/ {spl,zfs}' | tar -xpf - -C ~/repositories/
+```
+
+Installing build requirements for SPL and ZFS DKMS modules:
+
+``` {.wiki}
+sudo qubes-dom0-update dkms kernel-devel zlib-devel libuuid-devel libblkid-devel lsscsi bc autoconf automake binutils bison flex gcc gcc-c++ gdb gettext libtool make pkgconfig redhat-rpm-config rpm-build strace 
+```
+
+Configure and build SPL DKMS packages:
+
+``` {.wiki}
+cd ~/repositories/spl
+./autogen.sh
+./configure --with-config=user
+make rpm-utils rpm-dkms
+```
+
+Configure and build ZFS DKMS packages:
+
+``` {.wiki}
+cd ~/repositories/zfs
+./autogen.sh
+./configure --with-config=user
+make rpm-utils rpm-dkms
+```
+
+Install SPL and ZFS packages (i.e. version 0.6.2):
+
+``` {.wiki}
+sudo yum localinstall \
+    ~/repositories/spl/spl-0.6.2-1.qbs2.x86_64.rpm \
+    ~/repositories/spl/spl-dkms-0.6.2-1.qbs2.noarch.rpm \
+    ~/repositories/zfs/zfs-0.6.2-1.qbs2.x86_64.rpm \
+    ~/repositories/zfs/zfs-dkms-0.6.2-1.qbs2.noarch.rpm \
+    ~/repositories/zfs/zfs-dracut-0.6.2-1.qbs2.x86_64.rpm \
+    ~/repositories/zfs/zfs-test-0.6.2-1.qbs2.x86_64.rpm
+```
+
+Configure ZFS
+=============
+
+Automatically load modules
+--------------------------
+
+/etc/sysconfig/modules/zfs.modules
+
+``` {.wiki}
+#!/bin/sh
+
+for module in spl zfs; do
+    modprobe ${module} >/dev/null 2>&1
+done
+```
+
+Make this file executable.
+
+Tuning
+------
+
+Tame the memory-eating dragon (i.e. 512 Mb zfs\_arc\_max):
+
+/etc/modprobe.d/zfs.conf
+
+``` {.wiki}
+options zfs zfs_arc_max=536870912
+```
+
+Setup a zpool with ZFS datasets
+-------------------------------
+
+You can create a ZFS dataset for each AppVM, ServiceVM, HVM or TemplateVM or just use a pool as your backup location.
+
+Move your existing directory to a temporary location, or the ZFS mount will overlay your directory.
+
+Beware: VMs on a ZFS dataset aren't working, if your ZFS installation deserts you.
+
+So keep netvm, firewallvm and your templates on your root file-system (preferably on a SSD).
+
+``` {.wiki}
+zpool create -m none -o ashift=12 -O atime=off -O compression=lz4 qubes mirror /dev/mapper/<cryptname1> /dev/mapper/<cryptname2>
+zfs create -p qubes/appvms
+zfs create -m /var/lib/qubes/backup-zfs qubes/backup
+zfs create -m /var/lib/qubes/appvms/banking qubes/appvms/banking
+zfs create -m /var/lib/qubes/appvms/personal qubes/appvms/personal
+zfs create -m /var/lib/qubes/appvms/untrusted qubes/appvms/untrusted
+zfs create -m /var/lib/qubes/appvms/work qubes/appvms/work
+```
+
+Have fun with zpool and zfs.
+
+Tips and Hints
+==============
+
+Backup your data
+----------------
+
+You're depending on an huge amount of code for this file system, keep this in mind and backup your precious data.
+
+Encrypt underlying devices
+--------------------------
+
+``` {.wiki}
+dom0# cryptsetup -c aes-xts-plain64 luksFormat <device1>
+dom0# cryptsetup luksOpen <device1> <cryptname1>
+```
+
+With the use of cryptsetup a keyfile can be specified to decrypt devices.
+
+``` {.wiki}
+dom0# head -c 256 /dev/random > /root/keyfile1
+dom0# chmod 0400 /root/keyfile1
+dom0# cryptsetup luksAddKey <device1> /root/keyfile1
+```
+
+Decrypt devices on boot
+-----------------------
+
+Add your devices to /etc/crypttab.
+
+``` {.wiki}
+<cryptname1> <device1> none|<keyfile1>
+```
+
+Specifying a keyfile is especially useful, if ZFS should be ready during boot.
+
+Further Reading
+---------------
+
+-   [​http://www.open-zfs.org](http://www.open-zfs.org)
+-   [​http://zfsonlinux.org](http://zfsonlinux.org)
+