XCP-ng 8.1.0 beta now available!

  • Ok, new issue after the update:
    After the reboot of the server none of the VM's were started (including the VM with XO from the sources). I checked this in the status screen with a display connected to the server.

    I downloaded the latest daily version of xcp-ng center. Was able to connect to the server but no vm's were started as suspected.

    There I saw an error for my ISO repository that resides on my NAS (Samba). Trying to solve it from xcp-ng center did not work (SM has thrown thrown a generic python exception).

    I was able to start the XO vm and from there when trying to reconnect the ISO repository I got this error in the log:

    When trying to reconnect from the console:

    [13:21 xenserver-2 ~]# xe pbd-list
    uuid ( RO)                  : 46ee05c2-2f4d-ecbf-cbbd-5194384df464
                 host-uuid ( RO): 0092f4dd-09ae-41ba-98e6-2d45febf0e77
                   sr-uuid ( RO): ebc08968-b804-4cd5-7c1e-9e5f2c37e2de
             device-config (MRO): iso_path: /Xen; location: //n5550.home.xxx.yyy/Bestanden; type: cifs; vers: 3.0
        currently-attached ( RO): false
    [13:22 xenserver-2 ~]# xe pbd-plug uuid=46ee05c2-2f4d-ecbf-cbbd-5194384df464
    Error code: SR_BACKEND_FAILURE_1200
    Error parameters: , 'username',

  • Did some googeling and testing, but could not get the ISO repository to connect.
    Finally simply deleted the repository and created a new one to the same samba share. That worked at once.

    Think I might have created the issue myself bij not having ejected one "cd" from one of the vm's. Not sure is this was the cause, but will update my own documentation to eject all cd's first 🙂

    • Another thing I noticed is my VM's I set to autostart at boot do not autostart anymore at all.

    I already tried removing and setting the autostart option again for those vm's in XO, but after a reboot they still do not autostart

  • @olivierlambert Sorry. I'm new to this. Can you point me to a description of how it should look? Thanks. I appreciate your patience.

  • XCP-ng Team


  • XCP-ng Team

    @gdixon so I just added a virtual disk to an XCP-ng 8.1 VM (I often use nested virtualisation for testing) that appeared as sdc. I connected that XCP-ng host to Xen Orchestra and used XO to create an ext SR.

    That SR was created as ext4. No need for sm-additional-drivers for ext4 in XCP-ng 8.1.

    Extract from fstab

    /dev/mapper/XSLocalEXT--d0866df5--f9fe--2c3a--1332--8d549468dce7-d0866df5--f9fe--2c3a--1332--8d549468dce7 on /run/sr-mount/d0866df5-f9fe-2c3a-1332-8d549468dce7 type ext4 (rw,relatime)

    Note: even for ext local SRs, XCP-ng uses an LVM layer on top, hence the output of lsblk.

  • XCP-ng Team

    About VM autostart: as @r1 found out, there's a missing symlink in an XCP-ng updated via yum. That's a bug in the upgrade scripts that is present in CH 8.1 too, and we reported it to them.

    Here's the fix:

    systemctl enable xapi-wait-init-complete.service

  • @stormi @r1

    great find! I tested this, and it appears to at least correct the issue with autostart.

  • XCP-ng Team

    Thanks for the feedback 🙂

  • @stormi @r1 thank you! I do not have the equipment to test with ch8.1 but this is solved already I see. great catch

  • XCP-ng Team

    Indeed, also we reported the problem to Citrix, they might provide a fix one way or another.

  • XCP-ng Team

    Announcement about our former experimental ext4 SR driver:

    It is now deprecated in 8.1. For a good reason: in XCP-ng 8.1 and above, following upstream changes, the ext driver now formats new SRs as EXT4.

    There is no easy way to convert an existing SR created with our driver, so those using it will need to move the VDIs out (to another SR or to export them), destroy the SR and create an EXT SR instead. Make sure to do this on XCP-ng 8.1.

    The sm-additional-drivers package remains available in XCP-ng 8.1 in order to ease the transition (update: and also because it contains the XFS driver). However I've broken the sr-create command on purpose. Any attempt to create a SR of type ext4 will result in an error with a message that explains that you need to use the ext type instead.

    Our experimental driver will be completely removed in a later release, possibly XCP-ng 8.2. Unless someone convinces me to delay the removal for a good reason. I will accept reasons such as "I know I shouldn't have used the experimental driver in production, but I did and need more time to convert my SR while at the same time I really need feature xxx from XCP-ng 8.2", but I really would prefer to drop it in 8.2.

    Feedback from people doing the transition is welcome to make sure we document the transition in the best way possible.

  • @stormi
    what's the status of the xfs driver? Are you expecting that to be removed/deprecated as well?

  • XCP-ng Team

    No, it's still there and still working but not officially supported.

  • XCP-ng Team

    New leaf coalesce logic using dynamic limits

    I have backported patches from sm's master branch, that implement a new, smarter, logic for leaf coalescing.

    Just update your 8.1 beta, restart the toolstack, and that should be it.

    Those interested in the patches, see https://github.com/xcp-ng-rpms/sm/commit/ed1a55d727846cf5777c8258e6a8f3b068e8a35b (python code).

  • All my SRs are using the ext4 driver.

    So I just need to export the VMs, (to a NAS for example), destroy the SR, and recreate the SR, then import the VMs?

    I guess I’ll need to use XCP Center for this since I use XO community running on the SR that needs to be destroyed/recreated in a Debian VM.

  • Did anyone try VM export/import to see how much the performance has been improved?
    More interesting would be if someone tried it with 10G or making backups with XOA.

  • When will the final version of XCP-ng 8.1.0. be available?

  • XCP-ng Team

    RC should be there pretty soon. https://github.com/xcp-ng/xcp/issues/328

    stormi created this issue in xcp-ng/xcp

    closed XCP-ng 8.1 (meta issue) #328

  • I’ll wait till 8.1 drops before I mess with changing SR storage types.

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