Snapshot stun is a phenomenon that occurs when a VMware snapshot is removed and the virtual machine (VM) experiences a temporary freeze or performance degradation1. This can affect the availability and consistency of mission critical applications running on the VM.
To avoid snapshot stun, Veeam Backup & Replication offers several options for backing up Linux VMs, such as backup from storage snapshots, direct SAN access, or hot-add2. However, based on the business requirements, the best option is to run pre-freeze and post-thaw scripts before backing up the workload.
Pre-freeze and post-thaw scripts are custom scripts that you can configure to run on the Linux VM before and after the snapshot is taken. The pre-freeze script can be used to quiesce the application and flush its data to disk, ensuring a consistent backup. The post-thaw script can be used to resume the application and perform any necessary cleanup actions3.
By using pre-freeze and post-thaw scripts, you can achieve application consistency and minimize the impact of snapshot stun on the Linux VM. You can use the Veeam Backup & Replication user interface or the Veeam PowerShell snap-in to configure the scripts for the backup job3.
You can find more information about pre-freeze and post-thaw scripts and how to use them in the following resources:
Pre-Freeze and Post-Thaw Scripts
Best Practice for Backing Up Linux VMs
Snapshot Stun Issue
