Support Case ID: 00983814
Recently purchased Veeam so this isn't an issue that has just happened.
We use Hitachi HUS110 storage and a Hyper-V 2012 R2 cluster with 2 nodes.
I have been testing backups and there is strange behaviour when using the Hitachi HW VSS Provider and application aware enabled in the Veeam job. For example I have a 2012 R2 VM that fails when the Windows Firewall is enabled, but works every time when it's disabled, I then have another 2012 R2 VM that doesn't work at all, and another that works with the Firewall enabled. The Firewall settings were all the same.
In the past I've been able to backup some 2008 R2 VMs (up to 6 at once) using this method, but now they all fail so I have a test job that only has one VM at a time to test. These are all off-host with Direct FC to the HUS110, it also fails on-host with Hitachi HW VSS but works with Microsoft Software VSS.
Main error I receive is this:
- Code: Select all
06/08/2015 09:12:49 :: Unable to create snapshot Hitachi VSS Hardware Provider on Hyper-V Off-Host Backup Proxy (mode: Veeam application-aware processing). Details: Unknown status of async operation
The shadow copy provider timed out while holding writes to the volume being shadow copied. This is probably due to excessive activity on the volume by an application or a system service. Try again later when activity on the volume is reduced.
--tr:Failed to create VSS snapshot.
--tr:Failed to perform pre-backup tasks.
It's very frustrating to troubleshoot as there are so many different reasons from what I've seen online. I don't think it's taking a long time to take the snapshot as the error may suggest, or that there is high I/O..I just think it's unable to use the in VM VSS. Another note, if I disable Application Aware on the Veeam job every backup works.