Altaro VM Backup Support Centre

Direct SAN Transport mode (VMware Only)

Last Updated: Nov 21, 2017 12:07PM CET
SAN Transport mode requires Altaro VM Backup to run on a machine with access to SAN storage (Fibre Channel, iSCSI, or SAS connected) containing the virtual disks to be accessed. This is an efficient method because no data needs to be transferred through the production VMware ESX/ESXi host.

Altaro VM Backup will, by default, attempt to use Direct SAN Transport mode when available and will failover to other Virtual Disk Transport Methods if SAN Transport is not available.

Below are a few requirements to be taken into consideration when attempting to use SAN Transport Mode:
  1. The datastore must be of VMFS type
  2. Use DISKPART to verify "automount disabled" and "automount scrub" prior to mapping the LUNs. In some cases if this is not enough, you may need to set it to "OnlineALL"
  3. The LUN/Volume for each datastore containing a VM's data files, must be presented to the machine running Altaro VM Backup
  4. The LUN/Volume must appear in Disk Management on the Altaro VM Backup machine
  5. Altaro VM Backup mustn't be installed on a Virtual Machine and must be on a physical machine.

Further reading:


Troubleshooting Tips:

  1. To verify which transport mode is being used by Altaro VM Backup you can search for the following entry in the log file of the backup job in question:

    Altaro.Providers.Vmware.BackupRestore.VmwareRestoreStream.Connect(): Opening Disk

    Altaro.Providers.Vmware.BackupRestore.VmwareRestoreStream.Connect(): Disk Opened
    Altaro.Providers.Vmware.BackupRestore.VmwareRestoreStream..ctor(): Connected with transport mode: san

    Note: The backup job logs can be found in C:\Programdata\Altaro\AltaroBackupProfile\Logs\OpControllers\

  2. If you come across SSL subject name mismatch errors in the VMware VDDK logs, you can resolve this by importing the SSL certificate used by vCenter. Simply place it in the trusted CA container using the MMC certificates console for the computer account

  3. If Microsoft Windows is used as the VMware API Proxy instead of Linux, the following two Registry Keys must be created as the job will failover to NBD if they are not present:

    [HKEY_LOCAL_MACHINE\SOFTWARE\VMware, Inc.\VMware Virtual Disk Development Kit]

    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\VMware, Inc.\VMware Virtual Disk Development Kit]


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