---
name: satellite-ts-host-assign-file-system
title: Why does host assign fail with a `CRI-O` error?
description: Resolve CRI-O errors that occur when assigning a host to a Satellite cluster due to an unsupported file system type.
last-updated: 2026-08-17
---

> ## Documentation Index
> The table of contents for this documentation set is at https://cloud.ibm.com/docs/satellite?format=markdown
> The index for all IBM Cloud docs is at: https://cloud.ibm.com/docs/llms.txt
> Use these files to discover more information as needed.

# Why does host assign fail with a `CRI-O` error? 
{: #host-assign-file-system}

Resolve CRI-O errors that occur when assigning a host to a Satellite cluster due to an unsupported file system type.
{: shortdesc}

When you try to assign a host to a cluster, you see a message similar to the following error.
{: tsSymptoms}

``` sh
Dec 01 11:45:31 satellite.host crio[12190]: time="2021-12-01 11:45:31.818616215-06:00" level=info msg="Node configuration value for pid cgroup is true"
Dec 01 11:45:31 satellite.host crio[12190]: time="2021-12-01 11:45:31.818820217-06:00" level=info msg="Node configuration value for memoryswap cgroup is true"
Dec 01 11:45:31 satellite.host crio[12190]: time="2021-12-01 11:45:31.830378308-06:00" level=info msg="Node configuration value for systemd CollectMode is true"
Dec 01 11:45:31 satellite.host crio[12190]: time="2021-12-01 11:45:31.834555839-06:00" level=error msg="Node configuration validation for systemd AllowedCPUs failed: check systemd AllowedCPUs: exit status 1"
Dec 01 11:45:31 satellite.host crio[12190]: time="2021-12-01 11:45:31.834638109-06:00" level=info msg="Node configuration value for systemd AllowedCPUs is false"
Dec 01 11:45:31 satellite.host crio[12190]: time="2021-12-01 11:45:31.837060028-06:00" level=fatal msg="Validating root config: failed to get store to set defaults: kernel does not support overlay fs: 'overlay' is not supported over xfs at \"/var/data/criorootstorage/overlay\": backing file system is unsupported for this graph driver
```
{: screen}

The host file system is a type other than ext4.
{: tsCauses}

Convert the host file system to `ext4` or provision a new host with an `ext4` file system.
{: tsResolve}