These days I had to troubleshoot a problem with system time within a VMware vSphere VM. During backup VM freezes for more than 30 seconds. When this happens, system time in VM also stops and resets to current time after the freeze. And this behavior causes massive problems in the application-layer. During troubleshooting we found a very slow VM snapshot deletion on NFS volumes on […]
Analyse ReFS space savings with Block cloning (example Veeam)
This post shows three ways to analyse ReFS space savings with Block cloning. And because Veeam Backup&Replication uses this feature massively, I use this backup solution as an example here.
What is the size of a Changed Block Tracking block
An interesting question arose some time ago. A customer changed permissions of files on a Windows file-server VM. Changes were replicated using DFS. So far so good, but the amount of data that was processed at next incremental backup of target VM was even more than a full backup. Because incremental backup is based on VMware Changed Block Tracking (CBT) feature, it was suddenly interesting […]
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