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Follow Up on Acronis vmProtect October 11, 2011

Posted by audiomatron in Uncategorized.

I promised a follow up, so here goes!

In my previous article on Acronis vmProtect 6, I wrote about some issues I had with the software. Particularly, I expierenced the problem described here: http://kb.acronis.com/content/25536. Essentially, the problem is said to occur when change block tracking is enabled when backing up VMs with certain file systems – to be more specific, Linux file systems (the KB article says “certain file systems”, but Acronis told me Linux). I found that, at least in my situation, this is not the case.

I removed all of my Linux machines from my backups, split my backups into groups, and created new backup archives. All but one of my jobs succeeded. I watched the job that failed while it was running, and even though it got to 100%, it still logged a failure. I checked the logs, and lo and behold, there was the same set of errors from before. Since my VMs were in smaller groups, I was able to easily narrow down the offending VMs – both were Windows VMs. One of these servers is running Filemaker server,  a database server, on Windows 2008 R2. The other VM is running ArcGIS server, a server that provides maps and associated data, whose data is kept in a SQL express database. This server is running Windows Server 2008 R2 as well. In either case, neither Linux nor a different type of file system was the culprit (just NTFS!).

I’m still not sure what about these VMs was causing the backups to fail. However, I was able to work around the issue in order to get these VMs backed up. In the above referenced KB article from Acronis, it is suggested that change block tracking (CBT) is causing the failures. To test this, I created a separate backup job containing only these two VMs backing up to their own acrhive. The initial full backup was successful, but the incremental with CBT turned on failed. I turned off CBT, and the incremental backup succeeded.

Now, all of my backups are humming along quite nicely!



1. Leo - December 25, 2011

Could the reasno for the CBT error 354 be what is mentioned in this KB article (that the virtual machine hardware is below version 7)? –> http://forum.acronis.com/forum/26731

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