{"id":15979,"date":"2022-06-26T19:05:29","date_gmt":"2022-06-26T10:05:29","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=15979"},"modified":"2022-06-26T19:05:29","modified_gmt":"2022-06-26T10:05:29","slug":"%e5%a4%a7%e5%a4%9a%e6%95%b0%e3%81%ae%e4%bb%ae%e6%83%b3%e3%83%9e%e3%82%b7%e3%83%b3%e3%82%92%e5%a3%8a%e3%81%99","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=15979","title":{"rendered":"\u5927\u591a\u6570\u306e\u4eee\u60f3\u30de\u30b7\u30f3\u3092\u58ca\u3059"},"content":{"rendered":"\n

Real Time Streaming Protocol (rtsp)をRaspberry Pi 3 Model B (RPi3)でどう見るか<\/a>の続きです．<\/p>\n\n\n\n

残念ながらManjaroは，RPi3では動かないようです．そこで今度は，Ubuntuを試すことにしました．まずはx86_64 (AMD64)で試してからの方が早いだろうと思い，第2 workstation (WS2)の仮想マシンのUbuntuを久しぶりに動かしてみました．いつupgradeしたか全く記憶にありませんでしたが，LTS 20.04になっていました．せっかくだからこの際，最新の22.04にしようと，ネット検索してやり方を探しながら試みました．で，最後のまじない，<\/p>\n\n\n\n

do-release-upgrade<\/pre>\n\n\n\n
を実行していたところ，突然電源が切れました．すぐに何が起こったか解りました．もともと電源コードが緩いのです．ACスイッチをON\/OFFすると電源コードにどうしても触れて，しばらく繰り返すと，プラグが外れてしまいます．<\/p>\n\n\n\n
それが解っているので，電源ON\/OFFの際プラグを押し込む様にしていますが，しばらく忘れていたところ，一番抜けてはいけないタイミングで抜けてしまいました😓<\/p>\n\n\n\n
まあ，最近はjournaling file systemなので，途中でズバッと電源を切ったところで，ファイルシステム(FS)が壊れることは滅多にありません．しかし，do-release-upgradeの途中なのでdpkgデータベースがかなり深刻にダメージを受けているに違いありません．<\/p>\n\n\n\n
実際，ネットの情報を調べてaptなんとかかんとかしても，全然前進しません．こういうときのために，バックアップを取ってあります．<\/p>\n\n\n\n
しかし，そのバックアップのディスクイメージをコピーすると， “input\/output error” とかなんとか言ってコピーできません．rsyncでもcpでもだめです1<\/a><\/sup>md5sumでも同様のエラーが出ます．<\/span>．<\/p>\n\n\n\n
心配になってそのディスクにあるファイルを調べてみると，ここ1年以内に作ったqcow2以外のqcow2が皆同じエラーを出します．<\/p>\n\n\n\n
最初はSSDの問題か，マザーボードのインターフェースの問題か，あるいはSSDとマザーボードの相性の問題か，などと考え，問題のSSDをUSBエンクロージャーに入れて，Raspberry Pi 4 Model B (RPi4)につないでcpやrsyncを試しましたが，同じエラーが出ます．<\/p>\n\n\n\n
ということで，ここ1年より前に作った，まあ，知的資産のqcow2は全滅のようです．ほとんどここ数年触っていないファイルで，今回の電源断の時もリードオンリーでさえ開いていないので，電源断が問題とは思えません．<\/p>\n\n\n\n
まあ，古い仮想マシンの仮想ディスクなんか，滅多に役に立つことはないので，実害はないのですが，長年熟成してきたのに寂しい気はします．<\/p>\n","protected":false},"excerpt":{"rendered":"
Real Time Streaming Protocol (rtsp)\u3092Raspberry Pi 3 Model B (RPi3)\u3067\u3069\u3046\u898b\u308b\u304b\u306e\u7d9a\u304d\u3067\u3059\uff0e \u6b8b\u5ff5\u306a\u304c\u3089Manjaro\u306f\uff0cRPi3\u3067\u306f\u52d5\u304b\u306a\u3044\u3088\u3046\u3067\u3059\uff0e\u305d\u3053\u3067\u4eca\u5ea6\u306f\uff0cUbuntu\u3092\u8a66\u3059\u3053\u3068\u306b\u3057\u307e\u3057\u305f\uff0e\u307e\u305a\u306fx86_64 (AMD64)\u3067\u8a66\u3057\u3066\u304b\u3089\u306e\u65b9\u304c\u65e9\u3044\u3060\u308d\u3046\u3068\u601d\u3044\uff0c\u7b2c2 workstation (WS2)\u306e\u4eee\u60f3\u30de\u30b7\u30f3\u306eUbuntu\u3092\u4e45\u3057\u3076\u308a\u306b\u52d5\u304b\u3057\u3066\u307f\u307e\u3057\u305f\uff0e\u3044\u3064upgrade\u3057\u305f\u304b\u5168\u304f\u8a18\u61b6\u306b\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u304c\uff0cLTS 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\u305d\u308c\u304c\u89e3\u3063\u3066\u3044\u308b\u306e\u3067\uff0c\u96fb\u6e90ON\/OFF\u306e\u969b\u30d7\u30e9\u30b0\u3092\u62bc\u3057\u8fbc\u3080\u69d8\u306b\u3057\u3066\u3044\u307e\u3059\u304c\uff0c\u3057\u3070\u3089\u304f\u5fd8\u308c\u3066\u3044\u305f\u3068\u3053\u308d\uff0c\u4e00\u756a\u629c\u3051\u3066\u306f\u3044\u3051\u306a\u3044\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u629c\u3051\u3066\u3057\u307e\u3044\u307e\u3057\u305f\ud83d\ude13 \u307e\u3042\uff0c\u6700\u8fd1\u306fjournaling file 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\u3068\u3044\u3046\u3053\u3068\u3067\uff0c\u3053\u30531\u5e74\u3088\u308a\u524d\u306b\u4f5c\u3063\u305f\uff0c\u307e\u3042\uff0c\u77e5\u7684\u8cc7\u7523\u306eqcow2\u306f\u5168\u6ec5\u306e\u3088\u3046\u3067\u3059\uff0e\u307b\u3068\u3093\u3069\u3053\u3053\u6570\u5e74\u89e6\u3063\u3066\u3044\u306a\u3044\u30d5\u30a1\u30a4\u30eb\u3067\uff0c\u4eca\u56de\u306e\u96fb\u6e90\u65ad\u306e\u6642\u3082\u30ea\u30fc\u30c9\u30aa\u30f3\u30ea\u30fc\u3067\u3055\u3048\u958b\u3044\u3066\u3044\u306a\u3044\u306e\u3067\uff0c\u96fb\u6e90\u65ad\u304c\u554f\u984c\u3068\u306f\u601d\u3048\u307e\u305b\u3093\uff0e 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