Hi there,
To create a storage space, you must first create one or more storage pools. A storage pool is a collection of physical disks. From a storage pool, you can create one or more virtual disks.
First I would suggest you make sure that you have physical disks that you want to use meet the prerequisites.
In the above link, you can get the steps as well as other methods to achieve adding the new storage pool.
Hope this resolves the queries.
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