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    Testing ZFS with XCP-ng

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    • olivierlambertO Offline
      olivierlambert Vates 🪐 Co-Founder CEO
      last edited by olivierlambert

      How's the performance?

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      • borzelB Offline
        borzel XCP-ng Center Team
        last edited by borzel

        Currently hundred of gigabytes gets transfered 🙂

        I switched xenorchestra from the VM to our hardware backup server, so we can use the 10Gbit cards. (The VM run iperf about 1,6 Gbit/s, the hardware at around 6 GBit/s.)

        The data flow is:
        NFS-Storage(ZFS) -> XenServer -> XO -> XCP-ng (ZFS), all connected over 10GBit Ethernet.

        I did not measure correct numbers, was just impressed and happy that it runs 🙂

        I will try to express my data and meanings more detailed later...

        Setup

        0_1530657646909_f6ca6db4-cd16-44bf-9db4-8dacfe3be0df-grafik.png

        Settings

        • Alle servers are connected via 10GBit ethernet cards (Emulex OnConnect)
        • Xen1 and Xen2 are a pool, Xen1 is master
        • XenOrchestra connects per http:// (no SSL to improve speed)
        • DOM0 has 8GB RAM on XCP-ng AiO (so ZFS does use 4GB)

        Numbers

        • iperf between Backupserver and XCP-ng AiO: ~6 GBit's
        • Transfer speed of Continous Replication Job from Xen-Pool to XCP-ng AiO (output of zpool iostat with 30 seconds sample rate on XCP-ng AiO)

        0_1530658170537_7044bd63-39c3-4f93-aa3f-e97a596b6f26-grafik.png

        The speed varies a bit because of lz4 compression, current Compress Ratio: 1.64x

        Here a quick look at the graphs (on XCP-ng AiO)

        0_1530658863169_485d9208-50d8-4051-9853-762e8e02c201-grafik.png

        and a quick look at top (on XCP-ng AiO)

        0_1530659073283_c3c22e43-e039-4ddf-8d7c-f4700d37f9ff-grafik.png

        and arcstat.py (sample rate 1sec) (on XCP-ng AiO)

        0_1530659347665_97dd73d9-2d83-4c6b-a57b-d8d5528e4b74-grafik.png

        and arc_summary.py (on XCP-ng AiO)

        0_1530659545510_0c723c27-1666-4943-992c-c203c79178a5-grafik.png

        @olivierlambert I hope you can see somehting with these numbers 💻

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        • borzelB Offline
          borzel XCP-ng Center Team
          last edited by

          To avoid the problem with XenOrchestra runing as VM (and not using the full 10GBit of the host) I would install it directly inside DOM0. It could be preinstalled in XCP-ng as WEB-Gui 🙂

          Maybe I try this later on my AiO Server ...

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          • olivierlambertO Offline
            olivierlambert Vates 🪐 Co-Founder CEO
            last edited by

            Not a good idea to embed XO inside Dom0… (also it will cause issue if you have multiple XOs, it's meat to run at one place only).

            That's why the virtual appliance is better 🙂

            borzelB 1 Reply Last reply Reply Quote 0
            • borzelB Offline
              borzel XCP-ng Center Team @olivierlambert
              last edited by borzel

              @olivierlambert My biggest Question: Why is this not a good Idea?

              How do big datacenters solve the issue with the performance? Just install on Hardware? With virtual Appliance you are limited to GBit speed.

              I run more than one XO's, one for Backups and one for Useraccess. Don't want users on my Backupserver.

              Maybe this is something for a separat thread...

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              • olivierlambertO Offline
                olivierlambert Vates 🪐 Co-Founder CEO
                last edited by

                VM speed is not limited to GBit speed. XO proxies will deal with big infrastructures to avoid bottlenecks.

                borzelB 1 Reply Last reply Reply Quote 0
                • borzelB Offline
                  borzel XCP-ng Center Team @olivierlambert
                  last edited by

                  @olivierlambert ah, ok 🙂

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                  • borzelB Offline
                    borzel XCP-ng Center Team
                    last edited by borzel

                    I did a little more testing with ZFS, tried to move a disk from localpool to srpool

                    Setup

                    • XCP-ng on single 500Gb disk, ZFS-Pool created on a separat partition on that disk (~420GB) -> localpool -> SR named localzfs
                    • ZFS-Pool on 4 x 500GB Disks (Raid10) -> srpool -> SR named sr1

                    Error

                    0_1530972133820_4eefffb1-2464-4985-a46d-da41cc6403b3-grafik.png

                    Output of /var/log/SMLog

                     Jul  7 15:44:07 xen SM: [28282] ['uuidgen', '-r']
                     Jul  7 15:44:07 xen SM: [28282]   pread SUCCESS
                     Jul  7 15:44:07 xen SM: [28282] lock: opening lock file /var/lock/sm/4c47f4b0-2504-fe56-085c-1ffe2269ddea/sr
                     Jul  7 15:44:07 xen SM: [28282] lock: acquired /var/lock/sm/4c47f4b0-2504-fe56-085c-1ffe2269ddea/sr
                     Jul  7 15:44:07 xen SM: [28282] vdi_create {'sr_uuid': '4c47f4b0-2504-fe56-085c-1ffe2269ddea', 'subtask_of':      'DummyRef:|62abb588-91e6-46d7-8c89-a1be48c843bd|VDI.create', 'vdi_type': 'system', 'args': ['10737418240', 'xo-os', '', '', 'false', '19700101T00:00:00Z', '', 'false'], 'o_direct': False, 'host_ref': 'OpaqueRef:ada301d3-f232-3421-527a-d511fd63f8c6', 'session_ref': 'OpaqueRef:02edf603-3cdf-444a-af75-1fb0a8d71216', 'device_config': {'SRmaster': 'true', 'location': '/mnt/srpool/sr1'}, 'command': 'vdi_create', 'sr_ref': 'OpaqueRef:0c8c4688-d402-4329-a99b-6273401246ec', 'vdi_sm_config': {}}
                     Jul  7 15:44:07 xen SM: [28282] ['/usr/sbin/td-util', 'create', 'vhd', '10240', '/var/run/sr-mount/4c47f4b0-2504-fe56-085c-1ffe2269ddea/11a040ba-53fd-4119-80b3-7ea5a7e134c6.vhd']
                     Jul  7 15:44:07 xen SM: [28282]   pread SUCCESS
                     Jul  7 15:44:07 xen SM: [28282] ['/usr/sbin/td-util', 'query', 'vhd', '-v', '/var/run/sr-mount/4c47f4b0-2504-fe56-085c-     1ffe2269ddea/11a040ba-53fd-4119-80b3-7ea5a7e134c6.vhd']
                     Jul  7 15:44:07 xen SM: [28282]   pread SUCCESS
                     Jul  7 15:44:07 xen SM: [28282] lock: released /var/lock/sm/4c47f4b0-2504-fe56-085c-1ffe2269ddea/sr
                     Jul  7 15:44:07 xen SM: [28282] lock: closed /var/lock/sm/4c47f4b0-2504-fe56-085c-1ffe2269ddea/sr
                     Jul  7 15:44:07 xen SM: [28311] lock: opening lock file /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:07 xen SM: [28311] lock: acquired /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:07 xen SM: [28311] ['/usr/sbin/td-util', 'query', 'vhd', '-vpfb', '/var/run/sr-mount/319aebee-24f0-8232-0d9e-ad42a75d8154/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0.vhd']
                     Jul  7 15:44:07 xen SM: [28311]   pread SUCCESS
                     Jul  7 15:44:07 xen SM: [28311] vdi_attach {'sr_uuid': '319aebee-24f0-8232-0d9e-ad42a75d8154', 'subtask_of': 'DummyRef:|b0cce7fa-75bb-4677-981a-4383e5fe1487|VDI.attach', 'vdi_ref': 'OpaqueRef:9daa47a5-1cae-40c2-b62e-88a767f38877', 'vdi_on_boot': 'persist', 'args': ['false'], 'o_direct': False, 'vdi_location': 'ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0', 'host_ref': 'OpaqueRef:ada301d3-f232-3421-527a-d511fd63f8c6', 'session_ref': 'OpaqueRef:a27b0e88-cebe-41a7-bc0c-ae0eb46dd011', 'device_config': {'SRmaster': 'true', 'location': '/localpool/sr'}, 'command': 'vdi_attach', 'vdi_allow_caching': 'false', 'sr_ref': 'OpaqueRef:e4d0225c-1737-4496-8701-86a7f7ac18c1', 'vdi_uuid': 'ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0'}
                     Jul  7 15:44:07 xen SM: [28311] lock: opening lock file /var/lock/sm/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0/vdi
                     Jul  7 15:44:07 xen SM: [28311] result: {'o_direct_reason': 'SR_NOT_SUPPORTED', 'params': '/dev/sm/backend/319aebee-24f0-8232-0d9e-ad42a75d8154/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0', 'o_direct': True, 'xenstore_data': {'scsi/0x12/0x80': 'AIAAEmNhODhmOGRjLTRhYjYtNGIgIA==', 'scsi/0x12/0x83': 'AIMAMQIBAC1YRU5TUkMgIGNhODhmOGRjLTRhYjYtNGJlNy05MDg0LTFiNDFjYmM4YzFjMCA=', 'vdi-uuid': 'ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0', 'mem-pool': '319aebee-24f0-8232-0d9e-ad42a75d8154'}}
                     Jul  7 15:44:07 xen SM: [28311] lock: closed /var/lock/sm/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0/vdi
                     Jul  7 15:44:07 xen SM: [28311] lock: released /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:07 xen SM: [28311] lock: closed /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:08 xen SM: [28337] lock: opening lock file /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:08 xen SM: [28337] lock: acquired /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:08 xen SM: [28337] ['/usr/sbin/td-util', 'query', 'vhd', '-vpfb', '/var/run/sr-mount/319aebee-24f0-8232-0d9e-ad42a75d8154/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0.vhd']
                     Jul  7 15:44:08 xen SM: [28337]   pread SUCCESS
                     Jul  7 15:44:08 xen SM: [28337] lock: released /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:08 xen SM: [28337] vdi_activate {'sr_uuid': '319aebee-24f0-8232-0d9e-ad42a75d8154', 'subtask_of': 'DummyRef:|1f6f53c2-0d1e-462c-aeea-5d109e55d44f|VDI.activate', 'vdi_ref': 'OpaqueRef:9daa47a5-1cae-40c2-b62e-88a767f38877', 'vdi_on_boot': 'persist', 'args': ['false'], 'o_direct': False, 'vdi_location': 'ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0', 'host_ref': 'OpaqueRef:ada301d3-f232-3421-527a-d511fd63f8c6', 'session_ref': 'OpaqueRef:392bd2b6-2a84-48ca-96f1-fe0bdaa96f20', 'device_config': {'SRmaster': 'true', 'location': '/localpool/sr'}, 'command': 'vdi_activate', 'vdi_allow_caching': 'false', 'sr_ref': 'OpaqueRef:e4d0225c-1737-4496-8701-86a7f7ac18c1', 'vdi_uuid': 'ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0'}
                     Jul  7 15:44:08 xen SM: [28337] lock: opening lock file /var/lock/sm/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0/vdi
                     Jul  7 15:44:08 xen SM: [28337] blktap2.activate
                     Jul  7 15:44:08 xen SM: [28337] lock: acquired /var/lock/sm/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0/vdi
                     Jul  7 15:44:08 xen SM: [28337] Adding tag to: ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0
                     Jul  7 15:44:08 xen SM: [28337] Activate lock succeeded
                     Jul  7 15:44:08 xen SM: [28337] lock: opening lock file /var/lock/sm/319aebee-24f0-8232-0d9e-ad42a75d8154/sr
                     Jul  7 15:44:08 xen SM: [28337] ['/usr/sbin/td-util', 'query', 'vhd', '-vpfb', '/var/run/sr-mount/319aebee-24f0-8232-0d9e-ad42a75d8154/ca88f8dc-4ab6-4be7-9084-1b41cbc8c1c0.vhd']
                     Jul  7 15:44:08 xen SM: [28337]   pread SUCCESS
                    
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                    • borzelB Offline
                      borzel XCP-ng Center Team
                      last edited by

                      @borzel said in Testing ZFS with XCP-ng:

                      Jul 7 15:44:07 xen SM: [28311] result: {'o_direct_reason': 'SR_NOT_SUPPORTED',

                      Did find it after posting this and looking onto it... is this a known thing?

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                      • nraynaudN Offline
                        nraynaud XCP-ng Team
                        last edited by

                        that's weird: https://github.com/xapi-project/sm/blob/master/drivers/blktap2.py#L1002

                        I don't even know how my tests did work before.

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                        • olivierlambertO Offline
                          olivierlambert Vates 🪐 Co-Founder CEO
                          last edited by

                          Maybe because it wasn't triggered without a VDI live migration?

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                          • borzelB Offline
                            borzel XCP-ng Center Team
                            last edited by borzel

                            did no livemigration ...just local copy of a vm
                            ... ah, I should read before I answer ...

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                            • borzelB Offline
                              borzel XCP-ng Center Team
                              last edited by borzel

                              @nraynaud Is there any info how to build blktap2 myself to test with my homelab?
                              I did find it here: https://xcp-ng.org/forum/topic/122/how-to-build-blktap-from-sources/3

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                              • borzelB Offline
                                borzel XCP-ng Center Team
                                last edited by borzel

                                I tested the updated version of blktap and build it like described in https://xcp-ng.org/forum/post/1677, but copying a vm within the SR fails 😞

                                Async.VM.copy R:f286a572f8aa|xapi] Error in safe_clone_disks: Server_error(VDI_COPY_FAILED, [ End_of_file ])
                                
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                                • borzelB Offline
                                  borzel XCP-ng Center Team
                                  last edited by borzel

                                  the function safe_clone_disks is located in https://github.com/xapi-project/xen-api/blob/72a9a2d6826e9e39d30fab0d6420de6a0dcc0dc5/ocaml/xapi/xapi_vm_clone.ml#L139

                                  it calls clone_single_vdi in https://github.com/xapi-project/xen-api/blob/72a9a2d6826e9e39d30fab0d6420de6a0dcc0dc5/ocaml/xapi/xapi_vm_clone.ml#L116

                                  which calls Client.Async.VDI.copy from a XAPI-OCaml Module Client which I can not find 😞

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                                  • borzelB Offline
                                    borzel XCP-ng Center Team
                                    last edited by borzel

                                    found something in /var/log/SMlog

                                    Jul 21 19:52:40 xen SM: [17060] result: {'o_direct_reason': 'SR_NOT_SUPPORTED', 'params': '/dev/sm/backend
                                    /4c8bc619-98bd-9342-85fe-1ea4782c0cf2/8e901c80-0ead-4764-b3d9-b04b4376e4c4',
                                    'o_direct': True, 'xenstore_data': {'scsi/0x12/0x80': 'AIAAEjhlOTAxYzgwLTBlYWQtNDcgIA==', 'scsi/0x12/0x83': 
                                    'AIMAMQIBAC1YRU5TUkMgIDhlOTAxYzgwLTBlYWQtNDc2NC1iM2Q5LWIwNGI0Mzc2ZTRjNCA=', 'vdi-uuid': 
                                    '8e901c80-0ead-4764-b3d9-b04b4376e4c4', 'mem-pool': '4c8bc619-98bd-9342-85fe-1ea4782c0cf2'}}
                                    

                                    Note the 'o_direct': True in this log entry. But I created the SR with other-config:o_direct=false

                                    stormiS 1 Reply Last reply Reply Quote 0
                                    • stormiS Offline
                                      stormi Vates 🪐 XCP-ng Team @borzel
                                      last edited by

                                      @borzel I'll let @nraynaud have a say, but first, to be sure, you built it with

                                      xcp-build --build-local . --define 'xcp_ng_section extras'
                                      

                                      and the resulting RPM contains .extras in its name?

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                                      • borzelB Offline
                                        borzel XCP-ng Center Team
                                        last edited by borzel

                                        yes, I did 🙂 Checked it multiple times. Will check it again today to be 100% sure.

                                        I also saw the right logoutput from @nraynaud new function where he probes the open with O_DIRECT and retries with O_DSYNC.

                                        I have the "feel" that xapi or blktap copy's files in some situations without it's normal way. Maybe a special "file copy" without a open command?

                                        Can I attach a debugger to blktap while in operration? This would also be needed for deep support of the whole server.

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                                        • stormiS Offline
                                          stormi Vates 🪐 XCP-ng Team
                                          last edited by

                                          You can probably attach gdb to a running blktap, yes. Install the blktap-debuginfo package that was produced when you built blktap to make debug symbols available.

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                                          • nraynaudN Offline
                                            nraynaud XCP-ng Team
                                            last edited by

                                            @borzel there is something fishy around here https://github.com/xapi-project/sm/blob/master/drivers/blktap2.py#L994 I am still unsure what to do.

                                            I have not removed O_DIRECT everywhere in blktap, I was expecting to remove the remainder by the o_direct flag in python, but I guess I was wrong. we might patch the python.

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