12-15-2012 03:06 AM
Hello!
I have Windows 2012Datacenter (Russian) Cluster with Cluster Shared Volumes (for VMs). when I try to backup (Backupexec 2010 R3) VM from this cluster I have error:
Volume Shadow Copy Service error: Unexpected error query interface IVssWriterCallback. hr = 0x80070005, Access is denied.
. The most likely reason - incorrect security settings requesting process or recording process.
operation:
Data collection by the writer
context:
Class Code Writer: {e8132975-6f93-4464-a53e-1050253ae220}
Name the writer: System Writer
Writer Instance ID: {a5550c18-d3f0-4a2a-ab53-e908b8152a5d}
PS - i have same standalone 2012 server - all backups VM from this server goes without any error!
PS2 - i try change DCOM security on some cluster hosts - but it did not help...
(...
Go to DCOM setup : dcomcnfg --> Expand Component Services, Computers --> Right-click My Computer --> Properties --> COM Security tab.
Under Access Permission click Edit Default. --> add the "Network Service" account with Local Access allowed.
Restart the computer !
no more 8194 error.
...)
PS3 all servers disks for all servers placed on CX3-80 storage (Fiber).
PS4. if i try to backup CSV volume (with VM's folders) - all is OK! - without any error!
Solved! Go to Solution.
12-17-2012 02:21 AM
I have Windows 2012Datacenter (Russian) Cluster
Windows 2012 is not supported. See the SCL below
12-15-2012 04:23 AM
There are two ways to clear the problem.
The first is to locate the VSS writers (Start | Run | services.msc) that are erring out and change the account they are running under from Network Service to Local System. Then, restart the service process (or reboot the computer) and the VSS Writer will run with max privileges - thereby eliminating the IVssWriter callback errors.
The possible security issue with this method is that the service will be running with a higher level of access than Microsoft intended. Should the VSS Writer process be "hacked", this could be a security weakness. But, if you're not overly concerned about that, repeat this process for each VSS Writer that generates an 8194 error and you should not experience any more error events in normal operation.
The second (preferred) way to work around the issue is to make an adjustment to the default COM service activation permissions - allowing Network Service (and possibly Local Service) user account(s) to activate the IVssWriter callback interface. This method has the benefit of permanently fixing the issue in one place and allowing the VSS Writer service(s) to run at the privilege level that Microsoft intended. Any COM object accessed (by a process running as Network Service) still has the ability to enforce security restrictions it so chooses.
Make this fix by doing the follow: Start | Run | dcomcnfg. This bring up the Component Services application. On the left pane navigate to Component Services | Computer | MyComputer. Right click on MyComputer and select properties. Select the COM Security tab and select the Edit Default button under Access Permissions. Use the Add... button to add the "Network Service" account to the permission list. Verify that ONLY the Local Access box is checked and click OK. Close out of Component Services. A reboot is then required to make the requested changes to COM Security.
12-15-2012 06:17 AM
12-15-2012 05:07 PM
If you are going to quote extensively from a source, like
http://help.remote-backup.com/index.php?/Knowledgebase/Article/View/327/5/eliminating-vss-error-8194-from-event-log
it would be better that you provide a link to the source. Otherwise, people may think that you are plagarising.
12-15-2012 06:02 PM
If I understand you correctly, you are trying to backup a media server which is a VM. Symantec does not recommend the use of a VM for a media server because you would probably encounter problems accessing physical devices. You should always use a separate physical server for your media server.
12-17-2012 12:46 AM
i have:
1) symantec backupexec 2010R3 - hardware server
2) some cluster nodes with VM's on CSV
3) some standalone server with VM's
(1) make backup of all VM's, placed on (3) without errors.
(1) not make any VM's backups from (2)
PS/ ALL hardware in servers are identical - model DELL m600/
12-17-2012 02:21 AM
I have Windows 2012Datacenter (Russian) Cluster
Windows 2012 is not supported. See the SCL below