--- zfs-snapshot-mgmt~
+++ zfs-snapshot-mgmt
@@ -154,7 +154,11 @@ class FSInfo
   end
 
   def pool
+    if name["/"]
     name[/\A.*?\//].chop
+    else
+      name
+    end
   end
 
 private
@@ -175,7 +179,7 @@ private
 
 end
 
-class Config
+class ZConfig
   attr_reader :snapshot_prefix, :filesystems, :pools
 
   def initialize(value)
@@ -194,7 +198,7 @@ class Config
 
 config_yaml = File.open(CONFIG_FILE_NAME).read(CONFIG_SIZE_MAX)
 die "Config file too long" if config_yaml.nil?
-config = Config.new(YAML::load(config_yaml))
+config = ZConfig.new(YAML::load(config_yaml))
 
 now_minutes = Time.now.to_i / 60