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2005.05.04

TeraStation 死す

1TB TeraStation を RAID 5 で使おうと数ヶ月前に購入したが、Windows Server のソフトウェア RAID と比べてその遅さに驚き、ただのビデオ ファイルサーバーとなっていた。

Channel 9 の Jim Allchin のビデオ を後で見ようとこれに保存していたら、カチっと音がしたかと思うと TeraStation がオフラインに。あれれっと設定画面を見に行くと、

RAID アレイにエラーが発生しました。
2 台以上のディスクにエラーが発生したため、データを復旧することはできません。

え! ありえるか?

どのディスクに問題があるかも表示してくれない。正面の 4 つの LED は 4 つとも赤。ファームを更新してもだめ。

ディスク アレイを削除してから再起動してみると、正面の 4 つの LED の内、3 つが赤。ディスク 1, 2, 4 が壊れていて読めない。ディスクアレイ削除後だと、それぞれをフォーマットできる。それぞれ順次フォーマットしたら、全部緑に戻ってしまった。ディスクチェックのメニューがあったのでこれも実行してみると、なんの問題もなし。

1 つのファイルを書き込んでいる最中に購入数か月のディスク 3 台に同時にエラー。もちろん可能性はゼロではない。フォーマットしたら直ったのは、、、bad sectors を表示していないだけかもしれないが。いやいや。どう考えても TeraStation のバグの気がする。

作る側として考えてみると、ディスクを外してみたり、というテストはもちろんできるが、実際に書き込み中のエラーのテストとかってテスト環境を作るのが大変そうだ。きっとしていないに一票。

仕事に使ってなくてよかった。とは言え、まだ見ていないビデオもいくつかいっしょにお亡くなりに。

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Comments

> どう考えても TeraStation のバグの気がする。
その通りだと思います。バグがないRAID(あるの?! そんなもの)でも、
> RAID アレイにエラーが発生しました。
> 2 台以上のディスクにエラーが発生したため、
> データを復旧することはできません。
上記は発生します。RAIDの中の滅多にアクセスしないところが壊れていた事に気づかずに復旧処理を開始し、多重障害を検出して復旧不可能になります。
復旧時にホットスペアHDDを使うタイプでは回避可能なのですが、スペアドライブを積んでいないRAIDではアウトです。(;´д⊂)

低価格RAIDを使う場合、RAID5のファームウェアは重たい上、複雑なのでRAID0で腹をくくって使うのがお勧めかも・・・ またはRAID10で

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