{"id":28026,"date":"2025-11-30T15:57:41","date_gmt":"2025-11-30T06:57:41","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=28026"},"modified":"2025-11-30T15:57:41","modified_gmt":"2025-11-30T06:57:41","slug":"m4-mac-mini%e3%81%a7%e3%83%97%e3%83%81%e3%83%95%e3%83%aa%e3%83%bc%e3%82%ba%e9%a0%bb%e7%99%ba-9-%e3%80%9c%e7%a9%ba%e3%81%8d%e3%81%8c%e3%81%82%e3%81%a3%e3%81%a6%e3%82%82%e9%80%9f%e5%ba%a6%e4%bd%8e","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=28026","title":{"rendered":"M4 Mac mini\u3067\u30d7\u30c1\u30d5\u30ea\u30fc\u30ba\u983b\u767a (9) \u301c\u7a7a\u304d\u304c\u3042\u3063\u3066\u3082\u901f\u5ea6\u4f4e\u4e0b\u301c"},"content":{"rendered":"\n

Time MachineによるSnap ShotでSSDの空きが埋め尽くされたらSSDの速度，特に書き込み速度が大幅に低下し，酷いときにはプチフリーズが起こる，という前項での結論<\/a>で完結，と思いきや，SSDに空きがあり，まだSnap Shotが1つしかないのに，SSDの速度の低下を確認しました．<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

Snap Shotで空きが全部埋まっているとき<\/a>に比べれば速度低下は小さいです1<\/a><\/sup>測定時のStressは5GBに統一しています．<\/span>．<\/p>\n\n\n\n

また，プチフリーズについてですが，キー入力をしていると時々0.数秒表示が遅れますが，プチフリーズなのか，候補のリストを作成するのに時間がかかっているのかは微妙なところです．<\/p>\n\n\n\n

このSSDの速度の測定をしたとき，ファイルシステムとSnap Shotを除いたSSDの空きは1TBのうち320GBあります．ただひとつのSnap Shotでしたが32GBもありました．たぶん，仮想マシンの仮想ディスクの差分だと思います．<\/p>\n\n\n\n

Snap Shoptについては記録を残しそびれたので，次回同様の速度低下が認められたらスクリーンショットを撮ることにします．そのSnap Shotを消したら，通常の速度に戻りました．<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

もし数個のSnap ShotでSSDに十分な空きがあっても速度低下するとなると，これはAPFSの根本的な問題のように思います．<\/p>\n","protected":false},"excerpt":{"rendered":"

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