> For the complete documentation index, see [llms.txt](https://docs.ionos.com/cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ionos.com/cloud/databases/mariadb/overview/limitations.md).

# Limitations

## MariaDB v2

The following are a few limitations that you can encounter while using MariaDB v2:

* A cluster can have between 1 and 5 instances. For more information, see [<mark style="color:blue;">Configure the cluster</mark>](/cloud/databases/mariadb/how-tos/v2/create-mariadb-cluster.md#configure-the-cluster).
* A single instance can have between 1 and 62 dedicated CPU cores, depending on your quota. For more information, see [<mark style="color:blue;">Select the required number of resources</mark>](/cloud/databases/mariadb/how-tos/v2/create-mariadb-cluster.md#select-the-required-number-of-resources).
* A single instance can have between 4 and 240 GB of RAM, depending on your quota.
* Storage per instance can be between 10 and 4096 GB (4 TB), depending on your quota. Storage size can only be increased after the cluster is created; it cannot be reduced.
* Backup retention is configurable between 1 and 365 days. The default value is 7 days.

## MariaDB v1

The following are a few limitations that you can encounter while using MariaDB v1:

* The total upper limit for the **Number of CPUs** depends on your quota. A single instance cannot exceed 16 cores.
* The total upper limit for **RAM Size** depends on your quota. A single instance cannot exceed 32 GB.
* The upper limit for **Storage Size** is 2 TB.
* Storing cluster backups in an <code class="expression">space.vars.ionos\_cloud\_object\_storage</code> is limited to the last seven days.

## Shared limitations

The following IP address ranges cannot be used with MariaDB services:

* `10.208.0.0/12`
* `10.233.0.0/18`
* `192.168.230.0/24`
* `10.233.64.0/18`


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