@ronan-a for example, for ID 3407716 in SMlog for Dom0 master :
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] Setting LVM_DEVICE to /dev/disk/by-scsid/3624a93704071cc78f82b4df4000113ee
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] Setting LVM_DEVICE to /dev/disk/by-scsid/3624a93704071cc78f82b4df4000113ee
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] lock: opening lock file /var/lock/sm/5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/sr
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] LVMCache created for VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89
Jul 9 09:44:45 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893214.155789358'
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] ['/sbin/vgs', '--readonly', 'VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89']
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] lock: acquired /var/lock/sm/5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/sr
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] LVMCache: will initialize now
Jul 9 09:44:45 na-mut-xen-03 SM: [3407716] LVMCache: refreshing
Jul 9 09:44:46 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893215.105961535'
Jul 9 09:44:46 na-mut-xen-03 SM: [3407716] ['/sbin/lvs', '--noheadings', '--units', 'b', '-o', '+lv_tags', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89']
Jul 9 09:44:46 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:46 na-mut-xen-03 SM: [3407716] lock: released /var/lock/sm/5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/sr
Jul 9 09:44:46 na-mut-xen-03 SM: [3407716] Entering _checkMetadataVolume
Jul 9 09:44:46 na-mut-xen-03 SM: [3407716] vdi_list_changed_blocks {'host_ref': 'OpaqueRef:8bb2bb09-1d56-cb47-6014-91c3eca78529', 'command': 'vdi_list_changed_blocks', 'args': ['OpaqueRef:3a4d6847-eb39-5a96-f2c2-ffcad3da4477'], 'device_config': {'SRmaster': 'true', 'port': '3260', 'SCSIid': '3624a93704071cc78f82b4df4000113ee', 'targetIQN': 'iqn.2010-06.com.purestorage:flasharray.2498b71d53b104d9', 'target': '10.20.0.21', 'multihomelist': '10.20.0.21:3260,10.20.0.22:3260,10.20.1.21:3260,10.20.1.22:3260'}, 'session_ref': '******', 'sr_ref': 'OpaqueRef:78f4538b-4c0b-531c-c523-fd92f8738fc5', 'sr_uuid': '5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89', 'vdi_ref': 'OpaqueRef:05e1857b-f39d-47da-9c06-d0d35ba97f00', 'vdi_location': '9fae176c-2c5f-4fd1-91fd-9bdb32533795', 'vdi_uuid': '9fae176c-2c5f-4fd1-91fd-9bdb32533795', 'subtask_of': 'DummyRef:|dea7f1a8-9116-8be0-6ba8-c3ecac77b442|VDI.list_changed_blocks', 'vdi_on_boot': 'persist', 'vdi_allow_caching': 'false'}
Jul 9 09:44:47 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893215.990307086'
Jul 9 09:44:47 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893216.783648117'
Jul 9 09:44:48 na-mut-xen-03 SM: [3407716] lock: opening lock file /var/lock/sm/9fae176c-2c5f-4fd1-91fd-9bdb32533795/cbtlog
Jul 9 09:44:48 na-mut-xen-03 SM: [3407716] lock: acquired /var/lock/sm/9fae176c-2c5f-4fd1-91fd-9bdb32533795/cbtlog
Jul 9 09:44:48 na-mut-xen-03 SM: [3407716] LVMCache: refreshing
Jul 9 09:44:48 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893217.178993739'
Jul 9 09:44:48 na-mut-xen-03 SM: [3407716] ['/sbin/lvs', '--noheadings', '--units', 'b', '-o', '+lv_tags', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89']
Jul 9 09:44:48 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:49 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893218.029420281'
Jul 9 09:44:49 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-ay', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/9fae176c-2c5f-4fd1-91fd-9bdb32533795.cbtlog']
Jul 9 09:44:49 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:49 na-mut-xen-03 SM: [3407716] ['/usr/sbin/cbt-util', 'get', '-n', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/9fae176c-2c5f-4fd1-91fd-9bdb32533795.cbtlog', '-c']
Jul 9 09:44:49 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:49 na-mut-xen-03 SM: [3407716] fuser /dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/9fae176c-2c5f-4fd1-91fd-9bdb32533795.cbtlog => 1 / '' / ''
Jul 9 09:44:50 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893219.268237038'
Jul 9 09:44:50 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-an', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/9fae176c-2c5f-4fd1-91fd-9bdb32533795.cbtlog']
Jul 9 09:44:50 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:51 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893220.721225461'
Jul 9 09:44:51 na-mut-xen-03 SM: [3407716] ['/sbin/dmsetup', 'status', 'VG_XenStorage--5301ae76--31fd--9ff0--7d4c--65c8b1ed8f89-9fae176c--2c5f--4fd1--91fd--9bdb32533795.cbtlog']
Jul 9 09:44:51 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:51 na-mut-xen-03 SM: [3407716] lock: released /var/lock/sm/9fae176c-2c5f-4fd1-91fd-9bdb32533795/cbtlog
Jul 9 09:44:51 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893220.765534349'
Jul 9 09:44:52 na-mut-xen-03 SM: [3407716] lock: opening lock file /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:44:52 na-mut-xen-03 SM: [3407716] lock: acquired /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:44:52 na-mut-xen-03 SM: [3407716] LVMCache: refreshing
Jul 9 09:44:53 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893222.038114535'
Jul 9 09:44:53 na-mut-xen-03 SM: [3407716] ['/sbin/lvs', '--noheadings', '--units', 'b', '-o', '+lv_tags', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89']
Jul 9 09:44:53 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:54 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893222.921315355'
Jul 9 09:44:54 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-ay', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog']
Jul 9 09:44:54 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:54 na-mut-xen-03 SM: [3407716] ['/usr/sbin/cbt-util', 'get', '-n', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog', '-s']
Jul 9 09:44:54 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:54 na-mut-xen-03 SM: [3407716] fuser /dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog => 1 / '' / ''
Jul 9 09:44:55 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893224.138058885'
Jul 9 09:44:55 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-an', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog']
Jul 9 09:44:55 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:56 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893225.053222085'
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] ['/sbin/dmsetup', 'status', 'VG_XenStorage--5301ae76--31fd--9ff0--7d4c--65c8b1ed8f89-54bc2594--5228--411a--a4b2--cc1a7502d9a4.cbtlog']
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] lock: released /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] DEBUG: Processing VDI 54bc2594-5228-411a-a4b2-cc1a7502d9a4 of size 107374182400
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] lock: acquired /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] LVMCache: refreshing
Jul 9 09:44:56 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893225.076140954'
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] ['/sbin/lvs', '--noheadings', '--units', 'b', '-o', '+lv_tags', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89']
Jul 9 09:44:56 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:57 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893225.934427314'
Jul 9 09:44:57 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-ay', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog']
Jul 9 09:44:57 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:57 na-mut-xen-03 SM: [3407716] ['/usr/sbin/cbt-util', 'get', '-n', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog', '-b']
Jul 9 09:44:57 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:44:57 na-mut-xen-03 SM: [3407716] fuser /dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog => 1 / '' / ''
Jul 9 09:44:59 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893227.790063374'
Jul 9 09:44:59 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-an', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog']
Jul 9 09:44:59 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:45:00 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893228.82935698'
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] ['/sbin/dmsetup', 'status', 'VG_XenStorage--5301ae76--31fd--9ff0--7d4c--65c8b1ed8f89-54bc2594--5228--411a--a4b2--cc1a7502d9a4.cbtlog']
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] lock: released /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] Size of bitmap: 1638400
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] lock: acquired /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] LVMCache: refreshing
Jul 9 09:45:00 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893229.259729804'
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] ['/sbin/lvs', '--noheadings', '--units', 'b', '-o', '+lv_tags', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89']
Jul 9 09:45:00 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:45:01 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893230.644242194'
Jul 9 09:45:01 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-ay', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog']
Jul 9 09:45:02 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:45:02 na-mut-xen-03 SM: [3407716] ['/usr/sbin/cbt-util', 'get', '-n', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog', '-c']
Jul 9 09:45:02 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:45:02 na-mut-xen-03 SM: [3407716] fuser /dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog => 1 / '' / ''
Jul 9 09:45:02 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893231.488289557'
Jul 9 09:45:02 na-mut-xen-03 SM: [3407716] ['/sbin/lvchange', '-an', '/dev/VG_XenStorage-5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/54bc2594-5228-411a-a4b2-cc1a7502d9a4.cbtlog']
Jul 9 09:45:03 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:45:04 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893233.069490829'
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] ['/sbin/dmsetup', 'status', 'VG_XenStorage--5301ae76--31fd--9ff0--7d4c--65c8b1ed8f89-54bc2594--5228--411a--a4b2--cc1a7502d9a4.cbtlog']
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] pread SUCCESS
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] lock: released /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:45:04 na-mut-xen-03 fairlock[3949]: /run/fairlock/devicemapper sent '3407716 - 1893233.110222368'
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] Raising exception [460, Failed to calculate changed blocks for given VDIs. [opterr=Source and target VDI are unrelated]]
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] ***** generic exception: vdi_list_changed_blocks: EXCEPTION <class 'xs_errors.SROSError'>, Failed to calculate changed blocks for given VDIs. [opterr=Source and target VDI are unrelated]
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/SRCommand.py", line 113, in run
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] return self._run_locked(sr)
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/SRCommand.py", line 163, in _run_locked
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] rv = self._run(sr, target)
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/SRCommand.py", line 333, in _run
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] return target.list_changed_blocks()
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/VDI.py", line 761, in list_changed_blocks
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] "Source and target VDI are unrelated")
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716]
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] ***** LVHD over iSCSI: EXCEPTION <class 'xs_errors.SROSError'>, Failed to calculate changed blocks for given VDIs. [opterr=Source and target VDI are unrelated]
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/SRCommand.py", line 392, in run
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] ret = cmd.run(sr)
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/SRCommand.py", line 113, in run
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] return self._run_locked(sr)
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/SRCommand.py", line 163, in _run_locked
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] rv = self._run(sr, target)
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/SRCommand.py", line 333, in _run
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] return target.list_changed_blocks()
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] File "/opt/xensource/sm/VDI.py", line 761, in list_changed_blocks
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] "Source and target VDI are unrelated")
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716]
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] lock: closed /var/lock/sm/9fae176c-2c5f-4fd1-91fd-9bdb32533795/cbtlog
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] lock: closed /var/lock/sm/54bc2594-5228-411a-a4b2-cc1a7502d9a4/cbtlog
Jul 9 09:45:04 na-mut-xen-03 SM: [3407716] lock: closed /var/lock/sm/5301ae76-31fd-9ff0-7d4c-65c8b1ed8f89/sr