From owner-freebsd-users-jp@freebsd.org  Sat Apr 16 11:07:34 2016
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岡部です。

> ada1 が作れないというのは、
>
> gpart create -s gpt ada1
>
> でエラーになるので、ada1 が作られていないということです。
> 当然次のようにエラーとなります。

誤解があるようですが

gpart create -s gpt ada1

で /dev/ada1 が作られたりはしません。

gpart create -s gpt ada1

で行われるのは(存在する) /dev/ada1 に GPT の管理領域を作ることです。
/dev/adaN を作りたいのであればSATA接続のストレージデバイスを増設してくだ 
さい。

/dev/ada1に対応するSTAT接続のストレージデバイスを増設済みなのに
/dev/ada1がないという事であれば gpart でエラーが起きるのとは別の話です。

----
岡部 勝幸