NS8 startup very slow with Snaphot

Support
1

Hi,

I’m experiencing a strange problem lately.
I’ve installed NS8 in VMware and this is running good. When i take a snapshot the boot of my Debian12 is normal, but the startup of NS8 is extremely slow.
It take approx 10 minutes

When i remove the snapshots it is taking 1:32 min

What can this be. Any help is usefull

2

You could take a look at the log messages at boot.
The latest boot can be found via journalctl from a root shell like so:

journalctl -b

To get a list of boots:

 journalctl --list-boots

These can then be shown with for example

journalctl -b -1

Which will show the boot messages from the previous boot.

Then you can compare and hopefully get an idea of what might be the cause.

Regards,
/erik

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3

Another thing to consider is that VMWare snapshots create a delta file which grows in size with time which affects the perfomance so you shouldn’t use too many or old snapshots.
You could check the VMware disk I/O perfomance when running with and without snapshot, see vSphere Performance Monitoring: Why You Need It

From Best practices for using VMware snapshots in the vSphere environment :

  • Do not use VMware snapshots as backups.

The snapshot file is only a change log of the original virtual disk, it creates a place holder disk, virtual_machine-00000x-delta.vmdk, to store data changes since the time the snapshot was created. If the base disks are deleted, the snapshot files are not sufficient to restore a virtual machine.

  • Maximum of 32 snapshots are supported in a chain. However, for a better performance use only 2 to 3 snapshots.
  • Do not use a single snapshot for more than 72 hours.

The snapshot file continues to grow in size when it is retained for a longer period. This can cause the snapshot storage location to run out of space and impact the system performance.

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