Problem of Pool Names:
pool names that begin with mirror, raidz, or spare are not allowed as these name are reserved.
Error when using these names creating a pool in WebGUI.
ZFS Component Naming Requirements
Each ZFS component must be named according to the following rules:
Empty components are not allowed.
Each component can only contain alphanumeric characters in addition to the following
four special characters:
Pool names must begin with a letter, except that the beginning sequence c[0-9] is not
allowed. In addition, pool names that begin with mirror, raidz, or spare are not allowed as
these name are reserved.
Chapter 1 • Solaris ZFS File System (Introduction) 25
Dataset names must begin with an alphanumeric character.