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デバイスの不調の兆候を検出して、対応ができるようにします。
以下の兆候を検出します:
(1) I/O のレイテンシ増大。具体的には、x 回の I/O にかかる時間が y 秒以上であれば不調と判定する。
(2) I/O エラー増加。具体的には、x 秒以内に I/O エラーが x 回以上起起これば不調と判定する。
また、不調と判定した後、対応として以下が選択できます:
(1) すぐにデバイスを止める
(2) n 回までは耐える
(3) 無視してそのままデバイスを動かす (止めるのであれば手動でデバイスを止める想定)