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    Migration between pools slow down or interrupted

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

      So, as you can read in the log: SR_BACKEND_FAILURE_47. All CAPS messages are coming directly from the host. So it's NOT a Xen Orchestra issue, but something bad on your host.

      Tristis OrisT 1 Reply Last reply Reply Quote 0
      • Tristis OrisT
        Tristis Oris Top contributor @olivierlambert
        last edited by

        @olivierlambert that must like this
        xe vm-migrate uuid=65ab6d31-60ef-7352-bde9-e509a5727660 remote-master=1.2.3.4 remote-username=root remote-password=password host-uuid=1396f539-9f94-42db-a968-289163e0e26e vdi=? VM's disk vdi?

        Performing a Storage XenMotion migration. Your VM's VDIs will be migrated with the VM.
Will migrate to remote host: hostname, using remote network: eth2 Mng. Here is the VDI mapping:
VDI 9fcba1f0-bd8a-4f60-8298-519a22793cc8 -> SR 7d01ed49-f06a-31f0-42a3-c7fc8527e65c
This VIF was not mapped to a destination Network in VM.migrate_send operation
vif: 36099318-9cdb-751f-d127-8447a00c66cb

        what else i need to specify?

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

          As the answer given by the command, you need to provide a map for your VIFs and your VDIs.

          A map is telling which disk is going to which SR on destination, and which virtual interface is going to which network on destination

          Tristis OrisT 1 Reply Last reply Reply Quote 0
          • Tristis OrisT
            Tristis Oris Top contributor @olivierlambert
            last edited by

            @olivierlambert finally got it.
            vdi:vm vif id=new pool vif id, not new host.

            same speed as with XO.
            c07d9171-cbcf-4388-b065-cdb301f67916-image.png

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

              As I said, then 🙂 Your issue isn't XO related at all.

              Tristis OrisT 1 Reply Last reply Reply Quote 0
              • Tristis OrisT
                Tristis Oris Top contributor @olivierlambert
                last edited by Tristis Oris

                @olivierlambert yay!
                i'm rollback to 6b25a211518dc85700e9a7b81c1f8259f9475826 which is working for me from XO, then start migration from cli:
                c899d6f8-ed7f-4ba5-a350-e6f3e283dd38-image.png

                so, that HW or xen problem. could it be related with 8.2.1 clean installation? https://xcp-ng.org/forum/topic/6669/vdi_io_error-continuous-replication-on-clean-install?_=1672425861045

                but migration to\from this pool works after install 20 days ago.

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

                  1. XO version you are using doesn't matter in your case.
                  2. It's hard to answer, I'm not inside your infrastructure. So many moving pieces could affect the migration speed. Network, I/O load, VM size etc.
                  Tristis OrisT 1 Reply Last reply Reply Quote 0
                  • Tristis OrisT
                    Tristis Oris Top contributor @olivierlambert
                    last edited by Tristis Oris

                    @olivierlambert and last test, migration to 3rd pool - same speed.
                    so i have no idea what can be a cause.

                    upd
                    pool2<>pool3 migration fastas should be.
                    3rd was disabled, i just turn it on for this test.
                    so that only pool1 problem.

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

                      You can read https://xcp-ng.org/docs/troubleshooting.html and start digging in the logs 🙂

                      Tristis OrisT 1 Reply Last reply Reply Quote 0
                      • Tristis OrisT
                        Tristis Oris Top contributor @olivierlambert
                        last edited by

                        @olivierlambert still trying to find reason of problem. This question more about informative of logs.
                        something happens and now i can't migrate vms outside of pool
                        https://pastebin.com/afHQUiFB

                        ok it say The VDI is not available [opterr=Interrupted operation detected on this VDI, scan SR first to trigger auto-repair]
                        but on scan i got same log
                        https://pastebin.com/WKA1juqz

                        also problem with backups. That another physical storage, nfs connection but same error again.
                        99d5182f-ca0c-4f95-900c-efe0671d64d5-image.png

                        Also snapshot at few vms became orphaned and i can't delete them. again same log here.
                        https://pastebin.com/XPm1Y9Df

                        storage have no error, raid is healthy, i can rescan 2nd lun but have same problems with migration.
                        again nothing interesting at SMlog

                        Jan  9 20:05:07 : [3865] lock: released /var/lock/sm/lvm-22fc6b8e-19f0-880b-e604-68431a93f91c/9fcba1f0-bd8a-4f60-8298-519a22793cc8
Jan  9 20:05:07 : [3865] ***** LVHD over iSCSI: EXCEPTION <class 'util.CommandException'>, Invalid argument
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/SRCommand.py", line 376, in run
Jan  9 20:05:07 : [3865]     sr = driver(cmd, cmd.sr_uuid)
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/SR.py", line 156, in init
Jan  9 20:05:07 : [3865]     self.load(sr_uuid)
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/LVMoISCSISR", line 329, in load
Jan  9 20:05:07 : [3865]     LVHDSR.LVHDSR.load(self, sr_uuid)
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/LVHDSR.py", line 197, in load
Jan  9 20:05:07 : [3865]     self._undoAllJournals()
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/LVHDSR.py", line 1155, in _undoAllJournals
Jan  9 20:05:07 : [3865]     self._undoAllInflateJournals()
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/LVHDSR.py", line 1179, in _undoAllInflateJournals
Jan  9 20:05:07 : [3865]     lvhdutil.deflate(self.lvmCache, vdi.lvname, int(val))
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/lvhdutil.py", line 197, in deflate
Jan  9 20:05:07 : [3865]     vhdutil.setSizePhys(path, newSize)
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/vhdutil.py", line 262, in setSizePhys
Jan  9 20:05:07 : [3865]     ioretry(cmd)
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/vhdutil.py", line 102, in ioretry
Jan  9 20:05:07 : [3865]     errlist = [errno.EIO, errno.EAGAIN])
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/util.py", line 330, in ioretry
Jan  9 20:05:07 : [3865]     return f()
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/vhdutil.py", line 101, in <lambda>
Jan  9 20:05:07 : [3865]     return util.ioretry(lambda: util.pread2(cmd),
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/util.py", line 227, in pread2
Jan  9 20:05:07 : [3865]     return pread(cmdlist, quiet = quiet)
Jan  9 20:05:07 : [3865]   File "/opt/xensource/sm/util.py", line 190, in pread
Jan  9 20:05:07 : [3865]     raise CommandException(rc, str(cmdlist), stderr.strip())

                        is it possible to get more information from XO about whats really wrong?

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

                          No, the issue is deep within your host, and not in XO. You need to tail the SMlog while doing a scan, check if you have ISO mounted in your VM and all of that. This can take time, but if you do it carefully, you might your problem 🙂

                          Tristis OrisT 1 Reply Last reply Reply Quote 0
                          • Tristis OrisT
                            Tristis Oris Top contributor @olivierlambert
                            last edited by

                            @olivierlambert solved. that was somewhere here.

                            Jan 10 16:32:51 SM: [6019] lock: released /var/lock/sm/.nil/lvm
Jan 10 16:32:51 SM: [6019] ['/sbin/dmsetup', 'status', 'VG_XenStorage--22fc6b8e--19f0--880b--e604--68431a93f91c-VHD--9fcba1f0--bd8a--4f60--8298--519a22793cc8']
Jan 10 16:32:51 SM: [6019]   pread SUCCESS
Jan 10 16:32:51 SM: [6019] lock: released /var/lock/sm/lvm-22fc6b8e-19f0-880b-e604-68431a93f91c/9fcba1f0-bd8a-4f60-8298-519a22793cc8
Jan 10 16:32:51 SM: [6019] ***** LVHD over iSCSI: EXCEPTION <class 'util.CommandException'>, Invalid argument

                            one of VHD became corrupted so no backups, storage can't be mounted, speed issues, etc. Need to remove it manually and it works again.

                            in my opinion xen should ignore such error and work with SR same way like with hdd bad blocks. But it works how it works.

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

                              Good catch 🙂

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