# Exclude Set of Hypervisors While Migrating Instances Without Shared Storage

## Problem

Admin user would like to exclude a set of hypervisors to avoid migration of instances to noncompliant hosts.

## Environment

* Platform9 Managed OpenStack- All Versions

## Procedure

1. Login to the Clarity UI.
2. Open the 'Infrastructure' tab.
3. Select the hosts you don't want the instances to be migrated to.
4. Put those hosts in Maintenance Mode using the switch button shown in the image below.

<figure><img src="/files/RUvkaxC7OQ8O8m1CRvt6" alt="Screen_Shot_2019-07-31_at_6.48.53_PM.png"><figcaption><p>Screen_Shot_2019-07-31_at_6.48.53_PM.png</p></figcaption></figure>

**Note:** Hosts in Maintenance Mode will have its ***nova-compute*** service disabled. This will not allow any new instances to get spawned on the hosts. Existing instances will not get disrupted by this process.

## Additional Information

* [Further instructions and pointers about Maintenance Mode](https://support.platform9.com/hc/en-us/articles/360011568533-Enable-Maintenance-Mode-for-Authorized-Host)
* [Live Migration](https://docs.platform9.com/support/live-migration-with-platform9-managed-openstack/)


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