i see this in the worker log
14-04-08T13:49:36.232+01:00 [00296 info 'task-4'] VolumeBasedCloneTask::StopPreviousTrackingBitmaps: no bitmap ID(s) specified for the previous cloning iteration(s)
2014-04-08T13:49:36.232+01:00 [02408 info 'task-3'] Reusing existing VIM connection to srv-vcenter
2014-04-08T13:49:36.263+01:00 [02408 info 'task-3'] GetManagedDiskName: Get virtual disk filebacking [VMFS06] Srv-file3.notley.local-guest/Srv-file3.notley.local-guest.vmdk
2014-04-08T13:49:36.263+01:00 [02408 info 'task-3'] GetManagedDiskName: updating nfc port as 902
2014-04-08T13:49:36.263+01:00 [02408 info 'task-3'] GetManagedDiskName: get protocol as vpxa-nfcssl
2014-04-08T13:49:36.263+01:00 [02408 info 'task-3'] GetManagedDiskName: Get disklib file name as vpxa-nfcssl://[VMFS06] Srv-file3.notley.local-guest/Srv-file3.notley.local-guest.vmdk@10.35.248.201:902!52 2d 07 0c 59 9b 22 1e-1e a1 8a 40 3b b4 e0 99
2014-04-08T13:49:37.153+01:00 [00296 info 'Default'] Disk signature found 3936654020, disk size in sectors 3577747456, sector size 512
2014-04-08T13:49:37.153+01:00 [00296 info 'Default'] Partition found type HPFS/NTFS(7) name:HPFS/NTFS start:2048 size:3577741312 primary
2014-04-08T13:49:37.496+01:00 [00296 info 'Default'] Disk with signature 3936654020, recognized partitions 1
2014-04-08T13:49:37.496+01:00 [00296 warning 'task-4'] [MoveActiveDiskIfNeeded] GetFirstBootDisk failed, mntapi error: 176
2014-04-08T13:49:37.527+01:00 [02832 info 'ThreadPool'] Thread enlisted
2014-04-08T13:49:37.527+01:00 [00296 info 'Default'] MNTAPI: Mounted volume \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.543+01:00 [02832 info 'ThreadPool'] Thread delisted
2014-04-08T13:49:37.543+01:00 [02292 info 'ThreadPool'] Thread enlisted
2014-04-08T13:49:37.543+01:00 [00296 info 'Default'] MNTAPI: Mounted volume \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.559+01:00 [00296 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.559+01:00 [00296 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.574+01:00 [00296 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.590+01:00 [00296 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.590+01:00 [00296 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.605+01:00 [00296 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.605+01:00 [02292 info 'ThreadPool'] Thread delisted
2014-04-08T13:49:37.605+01:00 [00296 info 'task-4'] [LogMessagesForQA] System volume is not detected.
2014-04-08T13:49:37.605+01:00 [00296 info 'task-4'] [BaseComputerImpl::Open] Config file: [VMFS06] Srv-file3.notley.local-guest/Srv-file3.notley.local-guest.vmx
2014-04-08T13:49:37.605+01:00 [00296 info 'task-4'] VolumeBasedCloneTask source computer (unknown name) --> target VM (unknown name) updates, state: 1, percentage: 0, xfer rate (Bps): <unknown>
2014-04-08T13:49:37.605+01:00 [00296 info 'task-4'] CompositeTask::DoRun using 1 parallel connections for 1 tasks
2014-04-08T13:49:37.605+01:00 [02012 info 'task-4'] SingleVolumeCloneTask [source computer (unknown name)]-\WindowsBitmapDriverVolumeId=[C4-92-A4-EA-00-00-10-00-00-00-00-00] --> [target VM (unknown name)]-4,2)4*:.0000010000000000 updates, state: 1, percentage: 0, xfer rate (Bps): <unknown>
2014-04-08T13:49:37.605+01:00 [02012 info 'task-4'] GetVolumeCloneMgr: filesystem type: NTFS, source volume cluster size: 4096, target volume cluster size: 4096, source volume capacity: 2199020109824 bytes, target volume capacity: 1831803551744 bytes, resize requested: true.
2014-04-08T13:49:37.605+01:00 [02012 info 'task-4'] GetVolumeCloneMgr: File level cloning has been selected for volume \WindowsBitmapDriverVolumeId=[C4-92-A4-EA-00-00-10-00-00-00-00-00]
2014-04-08T13:49:37.605+01:00 [03716 info 'ThreadPool'] Thread enlisted
2014-04-08T13:49:37.621+01:00 [02012 info 'Default'] MNTAPI: Mounted volume \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.637+01:00 [03716 info 'ThreadPool'] Thread delisted
2014-04-08T13:49:37.637+01:00 [04072 info 'ThreadPool'] Thread enlisted
2014-04-08T13:49:37.637+01:00 [02012 info 'Default'] MNTAPI: Mounted volume \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.652+01:00 [02012 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.652+01:00 [02012 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.668+01:00 [02012 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.668+01:00 [02012 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.683+01:00 [02012 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.699+01:00 [02012 info 'Default'] Error 0 while call GetVolumeInformation for \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\ FS:<>
2014-04-08T13:49:37.699+01:00 [02012 info 'Default'] Start format volume \\.\vstor2-mntapi20-shared-C492A4EA000010000000000006000000\('') with NTFS 0
2014-04-08T13:49:58.234+01:00 [02012 info 'Default'] Format completed...
2014-04-08T13:49:58.234+01:00 [02012 info 'task-4'] Starting file-level volume based cloning with source volume \WindowsBitmapDriverVolumeId=[C4-92-A4-EA-00-00-10-00-00-00-00-00] and target volume 4,2)4*:.0000010000000000.
2014-04-08T13:51:45.483+01:00 [03892 info 'ThreadPool'] Thread enlisted
2014-04-08T13:59:10.469+01:00 [02016 error 'Ufa.HTTPService'] Failed to read request; stream: <io_obj p:0x01c78e54, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
2014-04-08T13:59:30.500+01:00 [02008 error 'Ufa.HTTPService'] Failed to read request; stream: <io_obj p:0x01c79694, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
2014-04-08T14:01:45.728+01:00 [02016 error 'Ufa.HTTPService'] Failed to read request; stream: <io_obj p:0x049fac24, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
2014-04-08T14:01:50.736+01:00 [02568 error 'Ufa.HTTPService'] Failed to read request; stream: <io_obj p:0x01c78794, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)