transportable snapshot issues on windows server 2012 R2 and iSCSI Target VSS hardware provider

Hi,

I have issues with transportable snapshot and iscsi target, i can't "mount" the snapshot.

My configuration:
-the first server have iscsi target server and backup software (CA arcserve)
-the second server have hyper-v with iscsi volume (from the first server) which host vhdx files.
Both server are windows server 2012R2 up to date, iSCSI Target VSS hardware provider installed and credential OK.

What i'm trying is to backup VM vhdx offhost with transportable snapshot.

Transportable snapshot creation works fine (with diskshadow.exe or arcserve via vss writer).
I can see the shadow copy on iscsi server ("list shadows all" from diskshadow.exe) and one iscsi snapshot (get-iscsivirtualdisksnapshot)
But the iscsiservertarget can find the shadow copy. I have event id 12362 and 12293.
Here's an example of Get-IscsiServerTarget | Format-Custom lunmappings

class IscsiServerTarget
{
  LunMappings =
    [
      class LunMapping
      {
        TargetName = tom-hyperv
        Path = D:\iSCSIVirtualDisks\tom-hyperv.vhdx
        Lun = 0
      }
      class LunMapping
      {
        TargetName = tom-hyperv
        Path = \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy{D0BF0F58-4DDA-11E3-80C9-002590D672D5}\iSCSIVirtualDisks\t
        om-hyperv.vhdx
        Lun = 1
      }

You can see the vhdx associated with iscsi target, and the shadow copy it tried to mount.

I have try to mount iscsi target on iscsi server, and try with disk offline or online. But mounting iscsi target on two server at the same time may corrupt the filesytem (isn't it ?).


I have contacted CA arcserve support, but they think it's a windows related issue.
Thanks for your help.