Testing ZFS with XCP-ng

[borzel]

@nraynaud

# yum info vhd-tool
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Installed Packages
Name        : vhd-tool
Arch        : x86_64
Version     : 0.20.0
Release     : 4.2.xcp.el7.centos.extras
Size        : 40 M
Repo        : installed
From repo   : xcp-ng-extras
Summary     : Command-line tools for manipulating and
            : streaming .vhd format files
URL         : https://github.com/xapi-project/vhd-tool
License     : LGPL+linking exception
Description : Simple command-line tools for manipulating an
            : streaming .vhd format file.

[nraynaud]

Thanks,
I have found a suspected O_DIRECT here, the solution won't come quickly.

[SeyedGH]

Does this issue also have a role if you run glusterfs on top of zfs?
Or is it just directly on zfs.

Because i would want to runs glusterfs on top of zfs on a spearate server, and use glusterfs driver to connect to it.

Do i also have this issue then?

[borzel]

@nraynaud I just tested with an up-to-date XCP-ng 7.5 host, same failure

# yum info vhd-tool
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Installed Packages
Name        : vhd-tool
Arch        : x86_64
Version     : 0.20.0
Release     : 4.3.xcp.el7.centos
Size        : 40 M
Repo        : installed
From repo   : xcp-ng-updates
Summary     : Command-line tools for manipulating and streaming .vhd format files
URL         : https://github.com/xapi-project/vhd-tool
License     : LGPL+linking exception
Description : Simple command-line tools for manipulating and streaming .vhd format file.

[nraynaud]

I am till on the issue, the subject is way deeper than expected.

[borzel]

@nraynaud take your time, no rush

[borzel]

Just added the setup part to https://github.com/xcp-ng/xcp/wiki/ZFS-on-XCP-ng-7.5-and-later#setup

[stormi]

Thanks @borzel

[dvdhngs]

Hello everybody! Newbie here, just 24h of xcp use, I was trying set Raid 10, but xcp only support Raid 1, so I'm trying now to set raidz, like on the document, I'm using 4 disks (500gb each), but I want to do Raid on this 4 disks (sda,sdb,sdc,sdd), so I can't? Need to be 6 disks? 2 raid 1 with xcp, and 4 raidz for other things?

[olivierlambert]

Hi,

There is 2 different things:

• soft RAID 1 support during install, using mdadm (the standard Linux software RAID mechanism)
• ZFS support for storage repositories (where you store your VM disks)

Regarding your use case, it depends. You can choose to install XCP-ng system without RAID and use only one disk, and the rest for ZFS SR. Or RAID1 for XCP-ng system, and the left disks for ZFS.

[dvdhngs]

@olivierlambert
Just to solve a doubt.... there is no way to install xcp-ng on software RAID 10, right?

[borzel]

@dvdhngs

install onto (mdadm/ZFS) RAID 10: no

to use (mdadm/ZFS) RAID 10 as SR: yes, of course!