Regarding Increasing ISE VM Disk Space

[ade5]

Good morning,

I am needing to increase an ISE VM policy server node disk from 200 to 500GB .

Is it okay to have us allocate the disk space to this server while it is running ? does it interrupt the policy server node operation? Any concerns?

I am planning on having our server team increase the disk space during business hours and reinstalling ise after hours for the disk to take effect.

[Panos Bouras]

hi @ade5 

The only way to increase ISE disk space is to create a new node with a larger disk assigned before you install ISE, as ISE partitions and formats the disk during installation and there's no way to increase disk space after installation.

Why don't you create a new VM and proceed the installation there during bussines hours, then you can restore your backup or join your ISE node to deployment. Just keep in mind that you cannot change the IP of a node while it's joined to an ISE deployment, only when is standalone.

As a note, if your server is going to be simply a PSN no additional roles assigned I believe that 300GB is the recommended disk size for production, check ISE installation guide for recommended VM size based your ISE version.

[Damien Miller]

It sounds like you already know that the node will not gain access to the disk space without reinstalling it from the ISO. You can do this online as long as you are not using the eager zero disk mode and running esxi 6+. If eager zero disk mode is enabled then it will pause the VM until the new disk has been written out on the datastore. This pause will cause the ISE services of the node to fail requiring a restart to get it back online. 

You would be best off organizing a time to shut down the VM, have the resource adjust the disk size of the VM, then reinstalling from the ISO in sequence.