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ZFS Naming restrictions.

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: Underscore (_) Hyphen (-) Colon (:) Period (.) Pool names must begin with a letter, except for the following restrictions: The beginning sequence c [ 0-9 ] is not allowed The name log is reserved A name that begins with mirror , raidz , or spare is not allowed because these name are reserved. In addition, pool names must not contain a percent sign ( % ) Dataset names must begin with an alphanumeric character. Dataset names must not contain a percent sign ( % ).