XCP-ng
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Register
    • Login

    Testing ZFS with XCP-ng

    Scheduled Pinned Locked Moved Development
    80 Posts 10 Posters 43.2k Views 3 Watching
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • 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 ...

      1 Reply Last reply Reply Quote 0
      • 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...

          1 Reply Last reply Reply Quote 0
          • 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 🙂

              1 Reply Last reply Reply Quote 0
              • 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
                
                1 Reply Last reply Reply Quote 0
                • 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?

                  1 Reply Last reply Reply Quote 0
                  • 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.

                    1 Reply Last reply Reply Quote 0
                    • olivierlambertO Offline
                      olivierlambert Vates 🪐 Co-Founder CEO
                      last edited by

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

                      1 Reply Last reply Reply Quote 0
                      • 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 ...

                        1 Reply Last reply Reply Quote 0
                        • 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

                          1 Reply Last reply Reply Quote 0
                          • 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 ])
                            
                            1 Reply Last reply Reply Quote 0
                            • 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 😞

                              1 Reply Last reply Reply Quote 0
                              • 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?

                                  1 Reply Last reply Reply Quote 0
                                  • 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.

                                    1 Reply Last reply Reply Quote 0
                                    • 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.

                                      1 Reply Last reply Reply Quote 0
                                      • 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.

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

                                          Maybe we can create a new SR type "zfs" and copy the file SR implementation from https://github.com/xapi-project/sm/blob/master/drivers/FileSR.py
                                          This would us later allow to create a more deeper integration of ZFS.

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

                                            Success! I changed in /opt/xensource/sm/blktap2.py

                                             elif not ((self.target.vdi.sr.handles("nfs") or self.target.vdi.sr.handles("ext") or self.target.vdi.sr.handles("smb"))):
                                            

                                            to

                                             elif not ((self.target.vdi.sr.handles("file")) or (self.target.vdi.sr.handles("nfs") or self.target.vdi.sr.handles("ext") or self.target.vdi.sr.handles("smb"))):
                                            

                                            Than I deleted /opt/xensource/sm/blktap2.pyc and /opt/xensource/sm/blktap2.pyo so that the *.py file is used.

                                            Now I can copy from other SR types to my ZFS SR.

                                            But copy within my ZFS SR does not work...

                                            1 Reply Last reply Reply Quote 0
                                            • First post
                                              Last post