diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index f34597a6..9ad7700e 100644
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -104,6 +104,13 @@ elif [[ "1ドル" == "stack" && "2ドル" == "test-config" ]]; then
 else
 iniset $TEMPEST_CONFIG compute-feature-enabled shelve True
 fi
+ # Attached volume extend support for rbd was introduced in Stein by
+ # I5698e451861828a8b1240d046d1610d8d37ca5a2
+ if [[ "$TARGET_BRANCH" =~ stable/(ocata|pike|queens|rocky) ]]; then
+ iniset $TEMPEST_CONFIG volume-feature-enabled extend_attached_volume False
+ else
+ iniset $TEMPEST_CONFIG volume-feature-enabled extend_attached_volume True
+ fi
 fi
 fi
 
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://opendev.org/openstack/devstack-plugin-ceph/commit/299e958635077c7f0823b91fcfd55a78439139c2.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://opendev.org/openstack/devstack-plugin-ceph/commit/299e958635077c7f0823b91fcfd55a78439139c2.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>