![]() Snapshots without capturing VM’s memory (AKA “clean” snapshots) revert you to the powered-off VM state. However, taking memory snapshots saves all volatile data and can be used to return a VM to the exact running state it was in when the snapshot was taken. This option effectively “stuns” the OS, whereas a stun duration depends on the IO intensity, memory utilization and other factors.Such snapshots take the longest to complete and cause most “downtime” in regard to the OS. Taking a snapshot of a virtual machine’s memory allows returning to the running VM state. ![]() The latest is available only if VMware Tools are installed. In order to create a snapshot in VMware ESXi, go to vSphere Web Client, select a VM and follow Action=> Snapshots=> Take Snapshot…īefore taking a snapshot, choose the appropriate mode: Snapshot the virtual machine’s memory, or Quiesce guest file system. You can find more information and recommendations in this article. ![]() One day, you may even run out of storage thanks to one of those guys. The longer you store the snapshot, the bigger file you get. Do not use one snapshot more than 72 hours.Still, do not use more than three snapshots for better performance. The chain cannot be longer than 32 snapshots.Here are several recommendations regarding snapshots in vSphere environment: In other words, use a hammer for nails and screwdriver for screws. Based on this, be smart and do not rely on them and use the proper set of tools for backups. If the corresponding storage goes down, you’ll lose all your data because you’ll be unable to restore everything from a snapshot. ![]() Each snapshot is associated with a certain set of indices (or a single index) to refer other blocks on the disk. Let’s be honest, snapshots are not backups. But please, do not consider a snapshot as a backup and vice versa! Thus, they will save your system from unpredictable failures. Typically, snapshots are used to return a virtual machine to its previous state in case of any errors during updates or configuration changes.
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