In a VM in ESXi 6.5 I have running OS, I'm taking a snapshot of the same. After that I'm changing operating system in that VM for any issues if I would like to restore the snapshot will it be available?
The snapshot represents the state of whatever was inside the VM at the time you took it - either just the virtual disks or also the memory (ie. the things you will be changing during your OS change - presumably an upgrade?)
The snapshot represents the state of whatever was inside the VM at the time you took it - either just the virtual disks or also the memory (ie. the things you will be changing during your OS change - presumably an upgrade?)
yes I'm taking about OS upgrade, so incase of any issue after OS upgrade it is possible to restore snapshot taken before the activity.
That's a legitimate use of a snapshot - they're often used with OS patching for the same reason.
A few things worth noting:
yes, that's correct.
that snapshot will take all the information residing on the disk and memory of the VM.