2012年10月22日月曜日

SDカードでRAIDが組める例のアレを分解してみた

楽天で860円だったので、とりあえず買ってみた。これ(Lapara RAID USB Enclosure)。楽天で「SD RAID」で検索すると出てくる。
似たようなものでサンワサプライのものも出てくるがそっちじゃないほう。
SDカードを2〜4枚挿すと、勝手にRAID0を組んでくれて、ひとつのUSB接続のHDD(というかSSD?)として動作するというようなイメージの説明がされているもの。
サンワサプライのものは、一つのUSBポートから2枚のSDカードが同時に認識できるというもので、ついでにパソコン側にソフトをインストールすればRAID0を組んだりRAID1にしてみたりということが出来るというもの。
ソフトウェアで対応しているから、RAID0とRAID1のどちらかが選べたり、素のままで2つのSDカードとして使ったりすることができる。一見便利なようだが、パソコンにソフトのインストールが必要なので、使用シーンは制限される。
反対に、こいつは、全部ハード側で対応しているのでRAID0にしかならないが、とりあえず挿せばいいのでFATでフォーマットしておけば大方のパソコンにぶっ挿すだけでHDDとして認識してくれるらしい。
ただ、RAID0ってのは冗長性がないから、SDを二つ挿せば信頼性は1/2、三つ挿せば1/3、四つ挿せば1/4になってしまう。理論上は大切なデータの保存には使いたくないシロモノだ。
で、どうやらRAID0という理由で、リード・ライトの速度向上が期待できる雰囲気の説明がされている。これについては、上海問屋のサイトが一応それっぽい数字を示している。
書き込みはそうでもないが、読み出しはちょっと速くなっているのだろうか。

まぁ、実物が手元にあるので、実物を見てみる。
パッケージも価格に見合った感じだなぁ~と思って見回していると、側面にRAID0と並んでJBODのロゴ(?)。

あれ? SDカードの容量がバラバラだとJBOD、容量が同じだとRAID0とか勝手に切り替えてくれるのだろうか。厳密には単にJBODだけなんだけど、使うぶんにはRAID0と変わりないよね、というおおざっぱな解釈でロゴっぽく載せてあるだけという気がする……

気になったので、軽く分解してみた。

写真の上下に大きく2つずつ銀色に光っているのがSDカードのソケット。左に金色に見えるのはUSB端子だ。ちょうど反対の右側にはアクセスランプ用のLEDが見える。LED周辺にあるのはどうやら電源用ICやらチップ抵抗、チップコンデンサがパラパラ。
ということは、機能のほとんどは、基板左側の少し大きめの正方形に見えるLSIが受け持っているようだ。こいつのスペックがわかれば大方の機能がわかるかもしれない。

よく見ると「jR7010」の文字、こいつの正体が知りたくて、とにかくjR7010をキーワードにいろいろ検索してみる。

http://www.mdn.co.jp/di/newstopics/20434/
エバーグリーンが輸入元らしい。

台湾ではこんな感じ。
http://www.web66.com.tw/CW367/JR7010%20MSD-N367115.html
おや? こっちのほうが高級っぽい。

ここでの販売元、柏德瑞克科技股イ分有限公司(パトリッツィリック技術有限公司:グーグル先生訳)の紹介。
http://www.web66.com.tw/CW121/%E6%9F%8F%E5%BE%B7%E7%91%9E%E5%85%8B-B121510.html
中国語なんで全然わからないが、「我們目前的官方經銷商的JR - Tek的IC産品」という一文を発見。「JR - Tek社製ICの公式ディーラー」という意味かな?
jR7010という刻印とJR-Tekという社名。間違いないだろう。このチップ、JR-Tekという会社の製品だ。

と、あったぞあったぞ、JR-Tek社の情報。
http://jp.tradekey.com/profile_view/uid/2947775.htm
どうやら、動物の皮下に打ち込むタイプのRFIDタグを売りたいらしい。
う〜んとRAIDドライバなんかのチップも作ってるはずなんだが……

で、もうちょと検索すると、ボードラックの会社が出てくる。
http://jp.tradekey.com/profile_view/uid/5300446.htm
こっちは英語なんでちょっと読んでみる。
柏德瑞克科技股イ分有限公司は海外ではBroadrack, Inc.で通してるんだな。(グーグル先生のパトリッツィリック技術有限公司ってのは何だったんだ。せめて発音だけでも合ってんのかな)
この柏德瑞克科技股イ分有限公司が2009年にIC部門を設立したらしい。jR-Tek社のICに関する販売権を取得するという形で新規事業に乗り出したようだ。それの目玉がこのSDカードRAIDディスク化商品ということらしい。
どういう経緯でそうなったかはわからないが、同じコンピュータ関係とはいえ、ラック屋さんが急にSDカードリーダーを売り出してもちょっとシナジー効果が薄すぎるような気がするなぁ……
本気ならそろそろUSB3.0対応とかSDXC対応なんかを出してきてもいいような気もするが、そういうのは無さそう。
まぁ大方、SDカードドライバとか、USBドライバのIPコア(intellectual property core)を買って組上げているのだろう。小型のIPコアが安価に出回るまではチップの開発ができないんだろうか。
いや、jR-TekがLSIの設計部門を売っぱらったんだろうな。もう次はないって気がする。

ふぅ、結局jR-Tekという会社にまでは行き着いたものの、具体的なチップの仕様についてはよくわからなかった。
SDカードの容量を比較してJBODとRAIDを切り替えるなんてこと、してないよなぁ〜
パッケージにはJBODって書かれてるのに、各販売サイトではRAID0って強調してるなぁ……

まぁ、そういう怪しいブツであることは間違いない(笑)
とはいえ、そろそろSDHCカードも技術的に枯れてきたので、それなりのメーカー製を買っていれば壊れることも無いだろう。SDカードが一枚故障しただけで、全部のデータがブッ飛ぶってことに、強引に目を瞑って使うしかないんだろうな。
ま、いいや、買ったんだし使おう。

ちなみに、こんなものもある(あった?)らしい。
「microSD/microSDHC用コンバイン接続対応カードリーダー」(DN-CR300D-BR)というものらしく、エバーグリーンのWeb直販限定で、価格は599円。
microSDとmicroSDHCに対応するカードリーダーで、USB差込端子側と本体腹部の各ソケットにカードを装着してPCと接続すれば、別個のドライブとして認識され、2ドライブとして使用できる。
また、2枚のカードを1枚として認識(コンバイン/JBOD設定)させることも可能で、容量は2枚の容量を合計になるらしい。コンバイン接続と解除には付属ソフトウェアを用いた設定とメモリカードのフォーマットが必要とのこと。
参照:microSDカードを2枚合わせてUSBメモリ化できるカードリーダー

JBODのIPコアが安売りされた時期ってのがあったのかな?

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