SSDには，書き込み回数による寿命があることは知られています．では，今売られているSSDの寿命はどのくらいなのかを，The Tech Reportというサイトが，継続的に取り組んで，報告してくれています．<\/p>\n
その結論的な記事が下のリンクです．<\/p>\n
一番早くだめになったSSDでも700TB書き込めて，標準的には1PB書き込めるという結論です．<\/p>\n
テストでは，240GB前後の容量のSSDを使っています．SSDは，書き込むブロックを分散させるようにできていますから，1TBのHDDの場合，理想的には4PBまで書き込める可能性があります．<\/p>\n
で，iostatで，自分の管理するLinux WSを見てみると，１日あたりの書き込みは1〜4GBです．まぁ，ディスクイメージをまるまるコピーするような作業をときどき行うなどして，１日の平均を多めに20GBと見積もって，寿命が1PBならば，137年，4PBまでOKなら，548年と言うことになります^^;<\/p>\n
もう一つのSSDの優れた点は，エラーが出て使えなくなるまで，読み書きともスピードの低下がほとんどないことです．<\/p>\n
スピードや容量が大幅に改善されたものが出てこない限り，交換不要の一生もんといえそうです．それよりも，経年変化でどこかの部品が先に壊れますね．<\/p>\n","protected":false},"excerpt":{"rendered":"
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