CEPH FS Storage Driver


  • XCP-ng Team

    Can you share /opt/xensource/sm/nfs.py as well... it was also supposed to be patched.


  • XCP-ng Team

    Updated new patch for XCP-NG 8.


  • XCP-ng Team

    Note that all are hacks are won't survive any upgrade and aren't supported 😉 But it's fine for a proof of concept.


  • XCP-ng Team

    Agree - unless we have enough interest from community to pack it or make it maintainable, it will stay a hack.

    Also mentioning the command to apply patch # patch -d/ -p1 < cephfs-8.patch

    Edit : updated patch strip level



  • Hello and thanks for the new patch. I understand that this is only a kind of hack or better a proof of concept. I do not want to use this for a productive system but only wanted to give it a try with nautilus and see what performance I can expect if this hack hopefully develops to a supported integration of Ceph.

    I hoped that the patch might work for XCP-ng 8.0 as well but it seems it does not that easily. So I could also install a xenserver 7.6 and use the original patch and test how it works for me. I do not want you to invest too much work in the 8.0 adoption. So if you think testing the patch 8.0 does not really help you in any way, then please do not hesitate and tell me. Else if you are as well interested to test if it works with 8.0 here is what I found out:

    The new patch does not work completely, there is a "patch unexpectedly ends in middle of line" -warning. On a fresh installed system:

    # cd /
    # patch --verbose -p0  < /cephfs-8.patch
    mm...  Looks like a unified diff to me...
    The text leading up to this was:
    --------------------------
    |--- /opt/xensource/sm/nfs.py   20199-27 16:45:11.918853933 +0530
    |+++ /opt/xensource/sm/nfs.py   20199-27 16:49:26.910379515 +0530
    --------------------------
    patching file /opt/xensource/sm/nfs.py
    Using Plan A...
    Hunk #1 succeeded at 137.
    Hunk #2 succeeded at 159.
    Hmm...  The next patch looks like a unified diff to me...
    The text leading up to this was:
    --------------------------
    |--- /opt/xensource/sm/NFSSR.py 20199-27 16:44:56.437557255 +0530
    |+++ /opt/xensource/sm/NFSSR.py 20199-27 17:07:45.651188670 +0530
    --------------------------
    patching file /opt/xensource/sm/NFSSR.py
    Using Plan A...
    Hunk #1 succeeded at 137.
    Hunk #2 succeeded at 160.
    patch unexpectedly ends in middle of line
    Hunk #3 succeeded at 197 with fuzz 1.
    done
    

    I can do a ceph.mount just like described before but when I instead try to create a new Ceph-FS-SR named "Ceph" in xencenter 8.0.0 I still get the error that SM has thrown a generic python exception.

    The SMlog error log indicates that creating a NFS repos is tried with the given parameters and not a CephFS one:

    ...
    Sep 30 13:03:05 rzinstal4 SM: [975] sr_create {'sr_uuid': '79cc55db-ee9f-9cc0-8d94-8cdb2915363b', 'subtask_of': 'DummyRef:|6456510f-b2dd-4dcd-b6ab-eb5eb40ceb9c|SR.create', 'args': ['0'], 'host_ref': 'OpaqueRef:72898e54-20b2-4046-9825-94553457fa60', 'session_ref': 'OpaqueRef:8a0819af-8b91-4086-a9cf-04ae37dc8e79', 'device_config': {'server': '1.2.3.4', 'SRmaster': 'true', 'serverpath': '/base', 'options': 'name=admin,secretfile=/etc/ceph/admin.secret'}, 'command': 'sr_create', 'sr_ref': 'OpaqueRef:91c592f6-47a0-40d6-8a33-7fe01831145f'}
    Sep 30 13:03:05 rzinstal4 SM: [975] ['/usr/sbin/rpcinfo', '-p', '1.2.3.4']
    Sep 30 13:03:05 rzinstal4 SM: [975] FAILED in util.pread: (rc 1) stdout: '', stderr: 'rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused
    Sep 30 13:03:05 rzinstal4 SM: [975] '
    Sep 30 13:03:05 rzinstal4 SM: [975] Unable to obtain list of valid nfs versions
    ...
    

    I attached my /opt/xensource/sm/nfs.py file as well.

    Thanks a lot

    Rainer
    nfs.py.txt


  • XCP-ng Team

    @r1 said in CEPH FS Storage Driver:

    patch -d/ -p0 < cephfs-8.patch

    Please try # patch -d/ -p0 < cephfs-8.patch


  • XCP-ng Team

    I see that there is a call to check_server_tcp which is expected to return True but not doing so in my patch. I'll modify it.


  • XCP-ng Team

    The same patch is updated. Kindly download again and try with # patch -d/ -p1 < cephfs-8.patch.



  • Thanks for the new patch. Applying the patch does not report any errors or warnings. When I try to create a "NFS" SR I still get the generic python error message from xencenter however the error message in /var/log/SMlog has changed:

    Oct  1 10:17:52 xenserver8 SM: [4975] lock: opening lock file /var/lock/sm/76ad6fee-a7a8-34e6-bcce-a53f69a677a9/sr
    Oct  1 10:17:52 xenserver8 SM: [4975] lock: acquired /var/lock/sm/76ad6fee-a7a8-34e6-bcce-a53f69a677a9/sr
    Oct  1 10:17:52 xenserver8 SM: [4975] sr_create {'sr_uuid': '76ad6fee-a7a8-34e6-bcce-a53f69a677a9', 'subtask_of': 'DummyRef:|c98cee36-24ff-4575-b7
    43-3a84cd93ed17|SR.create', 'args': ['0'], 'host_ref': 'OpaqueRef:72898e54-20b2-4046-9825-94553457fa60', 'session_ref': 'OpaqueRef:175293cb-a791-
    44be-bd5f-a4cb911adddb', 'device_config': {'server': '1.2.3.4', 'SRmaster': 'true', 'serverpath': '/base', 'options': 'name=admin,secretfil
    e=/etc/ceph/admin.secret'}, 'command': 'sr_create', 'sr_ref': 'OpaqueRef:a36f0371-1dc7-4685-a208-24e04a1c1e08'}
    Oct  1 10:17:52 xenserver8 SM: [4975] lock: released /var/lock/sm/76ad6fee-a7a8-34e6-bcce-a53f69a677a9/sr
    Oct  1 10:17:52 xenserver8 SM: [4975] ***** generic exception: sr_create: EXCEPTION <type 'exceptions.NameError'>, global name 'useroptions' is no
    t defined
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 110, in run
    Oct  1 10:17:52 xenserver8 SM: [4975]     return self._run_locked(sr)
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
    Oct  1 10:17:52 xenserver8 SM: [4975]     rv = self._run(sr, target)
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 323, in _run
    Oct  1 10:17:52 xenserver8 SM: [4975]     return sr.create(self.params['sr_uuid'], long(self.params['args'][0]))
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/NFSSR", line 216, in create
    Oct  1 10:17:52 xenserver8 SM: [4975]     raise exn
    Oct  1 10:17:52 xenserver8 SM: [4975]
    Oct  1 10:17:52 xenserver8 SM: [4975] ***** NFS VHD: EXCEPTION <type 'exceptions.NameError'>, global name 'useroptions' is not defined
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 372, in run
    Oct  1 10:17:52 xenserver8 SM: [4975]     return self._run_locked(sr)
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
    Oct  1 10:17:52 xenserver8 SM: [4975]     rv = self._run(sr, target)
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 323, in _run
    Oct  1 10:17:52 xenserver8 SM: [4975]     return sr.create(self.params['sr_uuid'], long(self.params['args'][0]))
    Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/NFSSR", line 216, in create
    Oct  1 10:17:52 xenserver8 SM: [4975]     raise exn
    Oct  1 10:17:52 xenserver8 SM: [4975]
    

  • XCP-ng Team

    Looks like variable declaration issue. I had it working for XCP-NG 7.6... Give me some time to fix this and make it working for 8.0


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