Storage: ZFS: Difference between revisions

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=zfs notes=
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==Native ZFS for Linux on Proxmox 2.0==
{{#pvedocs:pve-storage-zfspool-plain.html}}
*2012-02-25.  check  http://zfsonlinux.org/ See the Documentation and Community Resources for more information and help.
[[Category:Reference Documentation]]
<pvehide>
I had tried 3 other operating systems including Debian/kFreebsd and for each was able to recover all the zfs  file systems from previous installs. Even with disk name changes [bsd uses ad11, linux sdb ] no data was lost. Today I set up zfsonlinux using the following info on 2 prox 2.0 systems
Storage pool type: zfspool
 
This backend allows you to access local ZFS pools (or ZFS file systems
*install these
inside such pools).
aptitude install build-essential gawk alien fakeroot zlib1g-dev uuid uuid-dev libssl-dev parted  pve-headers-$(uname -r)
Configuration
*get make and install spl
The backend supports the common storage properties content, nodes,
<pre>
disable, and the following ZFS specific properties:
cd /usr/src
pool
git clone https://github.com/zfsonlinux/spl.git
Select the ZFS pool/filesystem. All allocations are done within that
cd spl
pool.
./configure
blocksize
make deb
Set ZFS blocksize parameter.
dpkg -i *.deb
sparse
modprobe spl
Use ZFS thin-provisioning. A sparse volume is a volume whose
</pre>
reservation is not equal to the volume size.
*get make and install zfs
mountpoint
<pre>
The mount point of the ZFS pool/filesystem. Changing this does not
cd /usr/src
affect the mountpoint property of the dataset seen by zfs.
git clone https://github.com/zfsonlinux/zfs.git
Defaults to /&lt;pool&gt;.
cd zfs
Configuration Example (/etc/pve/storage.cfg)
./configure
zfspool: vmdata
make deb
        pool tank/vmdata
dpkg -i *.deb
        content rootdir,images
</pre>
        sparse
 
File naming conventions
modprobe zfs
The backend uses the following naming scheme for VM images:
 
vm-&lt;VMID&gt;-&lt;NAME&gt;      // normal VM images
if you do not have and zfs pools made then put this to /etc/modules
base-&lt;VMID&gt;-&lt;NAME&gt;    // template VM image (read-only)
spl
subvol-&lt;VMID&gt;-&lt;NAME&gt; // subvolumes (ZFS filesystem for containers)
zfs
&lt;VMID&gt;
 
This specifies the owner VM.
reboot to make sure modules load at boot.   I found on one system with limited memory [ compared to what was running] that zfs module would not load .
&lt;NAME&gt;
 
This can be an arbitrary name (ascii) without white space. The
*'''note , the deb files made above can be used to install zfs on another system'''.
backend uses disk[N] as default, where [N] is replaced by an
 
integer to make the name unique.
=Creating Pools and Filesystems=
Storage Features
'''use raidz2 or mirror in main data systems.'''
ZFS is probably the most advanced storage type regarding snapshot and
 
cloning. The backend uses ZFS datasets for both VM images (format
==Create a raidz pool named “tank”==
raw) and container data (format subvol). ZFS properties are
zpool create  -f -o ashift=12 tank  raidz  /dev/sda  /dev/sdb  /dev/sdc  /dev/sdd  /dev/sde  /dev/sdf  /dev/sdg  /dev/sdh
inherited from the parent dataset, so you can simply set defaults
 
on the parent dataset.
*note this happened to 2 or 3 disks the 1-st time. these were disks from a 3-ware raid.
Table 1. Storage features for backend zfs
<pre>
Content types
zpool create  -f -o ashift=12 tank  raidz2  /dev/sda  /dev/sdb  /dev/sdc  /dev/sdd  /dev/sde  /dev/sdf  /dev/sdg  /dev/sdh
Image formats
invalid vdev specification
Shared
the following errors must be manually repaired:
Snapshots
cannot stat /dev/sdg2: No such file or directory
Clones
</pre>
images rootdir
had to use fdisk to add partitions 1 , 2 etc to those disks .   I forget if I left the partitions there or not. but had to add to get this fixed.
raw subvol
 
no
==Create filesystems, and mount points==
yes
 
yes
*for pve backups and templates:
Examples
<pre>
It is recommended to create an extra ZFS file system to store your VM images:
zfs create tank/data
# zfs create tank/vmdata
zfs set mountpoint=/data tank/data
To enable compression on that newly allocated file system:
zfs create tank/data/pve-storage
# zfs set compression=on tank/vmdata
</pre>
You can get a list of available ZFS filesystems with:
 
# pvesm zfsscan
results in
See Also
<pre>
Storage
df /data/pve-storage
ZFS on Linux
Filesystem    Type    Size  Used Avail Use% Mounted on
</pvehide>
tank/data/pve-storage
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              zfs    2.7T    0  2.7T  0% /data/pve-storage
</pre>
 
*as of 2012-02-27 kvm would not start when put directly on a zfs .
<pre>
qm start 3016
kvm: -drive file=/data/pve-storage/images/3016/vm-3016-disk-1.raw,if=none,id=drive-virtio0,aio=native,cache=none: could not open disk image /data/pve-storage/images/3016/vm-3016-disk-1.raw: Invalid argument
start failed: command '/usr/bin/kvm -id 3016 -chardev 'socket,id=monitor,path=/var/run/qemu-server/3016.mon,server,nowait' -mon 'chardev=monitor,mode=readline' -vnc unix:/var/run/qemu-server/3016.vnc,x509,password -pidfile /var/run/qemu-server/3016.pid -daemonize -usbdevice tablet -name fbc16-kvm -smp 'sockets=1,cores=2' -nodefaults -boot 'menu=on' -vga cirrus -k en-us -drive 'if=none,id=drive-ide2,media=cdrom,aio=native' -device 'ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2,bootindex=200' -drive 'file=/data/pve-storage/images/3016/vm-3016-disk-1.raw,if=none,id=drive-virtio0,aio=native,cache=none' -device 'virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100' -m 1024 -netdev 'type=tap,id=net0,ifname=tap3016i0,script=/var/lib/qemu-server/pve-bridge,vhost=on' -device 'virtio-net-pci,mac=BA:42:BC:AC:D8:4B,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300'' failed: exit code 1
</pre>
 
using ext2 on zfs worked. see http://zfsonlinux.org/example-zvol.html  .
<pre>
zfs create -V 100G tank/fish
 
# sfdisk did not work , use this:
Try `parted` instead, which will create the partition at offset 16 by default, which `mkfs.ext2` should use without complaint.  For example:
 
    parted /dev/tank/fish
    (parted) mkpartfs primary ext2 0 -1
    (parted) quit
   
mkdir -p /mnt/tank/fish-part1
mount /dev/zvol/tank/fish-part1 /mnt/tank/fish-part1
</pre>
then use /mnt/tank/fish-part1  for images storage in pve .
 
==destroy==
to start over
zpool destroy zfs-pool
 
==Setting Properties==
*Automatically NFS-export all home directories  [ I do not know how to use zfs nfs yet , or if it works yet in linux...].
zfs set sharenfs=rw tank/home
*check sharenfs 
<pre>
zfs get sharenfs tank/home
NAME    PROPERTY  VALUE    SOURCE
tank/home  sharenfs  rw        local
</pre>
*Turn on compression for everything in the pool
zfs set compression=on tank
 
=zfs links and docs=
*http://zfsonlinux.org/faq.html
 
*http://hub.opensolaris.org/bin/download/Community+Group+zfs/docs/zfslast.pdf
 
and this has some very important information to know before implementing zfs on a production  system.
*http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide
 
check these well written manual pages:
man zfs
man zpool
 
= How to install ZFS-fuse under Proxmox =
 
(Tested with Kernel 2.6.32)
 
  apt-get install build-essential libaio-dev libattr1-dev libacl1-dev libz-dev libz-dev libfuse-dev libfuse2 scons libssl-dev
  wget -nd http://zfs-fuse.net/releases/0.6.0/zfs-fuse-0.6.0.tar.bz2
  tar jxvf zfs-fuse-0.6.0.tar.bz2
  cd zfs-fuse-0.6.0
  cd src
  scons
  scond install
 
Fire up ZFS-fuse daemon
  /usr/local/sbin/zfs-fuse
 
Create Zpool
  zpool create -m /var/lib/vz/images2 /dev/sdb
 
Create ZFS
  zfs create images2/109
 
ZFS clone a vm 109 to vm 110
  zfs snapshot images2/109@master
  zfs clone images2/109@master images2/110
 
= Debian GNU/kFreeBSD =
'''As of 2012-02 the squeeze version does not have NFS, so AFAIK can not be used for Proxmox storage.''' When  Debsd has nfs support then I'd use this for storage of iso's and backups to start.  In the mean time this works as a samba server..
 
zfs works much better using  Debian/GNU kFreeBSD  then fuse.
 
after installing the system to kvm or hardware:
 
*add some disks .  in KVM i was only able to get ide to work.
 
*the scsi disks look like:
<pre>
ls /dev/ad*
/dev/ad10  /dev/ad10s1  /dev/ad10s2  /dev/ad11  /dev/ad12  /dev/ad13
</pre>
 
*  per http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide  - if I read it right - use entire disk not slices for zfs (I assume slices = partitions).
 
*if the disks have partition tables, then clear them. just not the operating system disk!   I used fdisk to clear the tables. This may not be necessary , if it is not then please delete this part.
<pre>
fdisk /dev/ad11
o
w
</pre>
then same for ad12 and ad13
 
*install this
aptitude install zfsutils
 
*make a pool
zpool create -f  zfs-pool /dev/ad11 /dev/ad12  /dev/ad13
 
df | grep zfs-pool
zfs-pool      zfs    1.4T  18K  1.4T  1% /zfs-pool
 
*http://wiki.debian.org/Debian_GNU/kFreeBSD

Latest revision as of 08:08, 6 December 2019

Storage pool type: zfspool

This backend allows you to access local ZFS pools (or ZFS file systems inside such pools).

Configuration

The backend supports the common storage properties content, nodes, disable, and the following ZFS specific properties:

pool

Select the ZFS pool/filesystem. All allocations are done within that pool.

blocksize

Set ZFS blocksize parameter.

sparse

Use ZFS thin-provisioning. A sparse volume is a volume whose reservation is not equal to the volume size.

mountpoint

The mount point of the ZFS pool/filesystem. Changing this does not affect the mountpoint property of the dataset seen by zfs. Defaults to /<pool>.

Configuration Example (/etc/pve/storage.cfg)
zfspool: vmdata
        pool tank/vmdata
        content rootdir,images
        sparse

File naming conventions

The backend uses the following naming scheme for VM images:

vm-<VMID>-<NAME>      // normal VM images
base-<VMID>-<NAME>    // template VM image (read-only)
subvol-<VMID>-<NAME>  // subvolumes (ZFS filesystem for containers)
<VMID>

This specifies the owner VM.

<NAME>

This can be an arbitrary name (ascii) without white space. The backend uses disk[N] as default, where [N] is replaced by an integer to make the name unique.

Storage Features

ZFS is probably the most advanced storage type regarding snapshot and cloning. The backend uses ZFS datasets for both VM images (format raw) and container data (format subvol). ZFS properties are inherited from the parent dataset, so you can simply set defaults on the parent dataset.

Table 1. Storage features for backend zfs
Content types Image formats Shared Snapshots Clones

images rootdir

raw subvol

no

yes

yes

Examples

It is recommended to create an extra ZFS file system to store your VM images:

# zfs create tank/vmdata

To enable compression on that newly allocated file system:

# zfs set compression=on tank/vmdata

You can get a list of available ZFS filesystems with:

# pvesm zfsscan

See Also


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