ddコマンドでディスクまるごとコピー

そう、少し前まで、ファイルサーバーの/ディレクトリのディスクは

USBメモリを２つ使ってRAID1を組んでいたのですが、起動時に

こんなことを言われることが頻繁におこり、でも実際はdegradeしてない

という意味不明な状況だったりして、むむむな状態にしびれを切らして、

RAIDはやめて、USBメモリをちょくちょくもう一つのUSBメモリに

コピーすればいいじゃないですか。。

という訳で、早速コピーしてみました

# dd if=/dev/sdb of=/dev/sdd

ifでコピー元

ofでコピー先

のUSBメモリを指定します。

# おわかりの通り、逆にすると悲惨なことになりますので、ご注意を

8GBのUSBメモリですが、転送速度が遅いので、それなりに時間が

かかります。

コピーが完了すると、

15949824+0 records in

15949824+0 records out

8166309888 bytes (8.2 GB) copied, 1741.72 s, 4.7 MB/s

などと表示されます。

これで、コピー完了

USBメモリを差し替えて、起動してみます。

OK

ちゃんと起動しました。

今回は起動中のUSBメモリから空のUSBメモリへコピーしました。

完全にコピーするなら、起動中のubuntuを一度終了させて、

他のddコマンドが使えるOSで二つのUSBメモリを認識させて、

コピーするのがいいのでしょうが、、、面倒なので

ま、動いたので、これで良しとしましょう

コメント 29

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