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    --- tags: 1082, lsa --- # Week 16 (2020/6/11) - Book mode https://hackmd.io/@ncnu-opensource/By4H6JLNW ## 備份 ### BT 補充 現代 RAID 會有 header,即使主機板毀損,換新的主機板就可以復原 RAID - 純軟體磁碟陣列 - 軟體寫在 BIOS 上 - 若主機板損壞,可能難以購買同款主機板重建 RAID - 直接實作在作業系統上 - 主機板損壞不影響 - ZFS - 可用傳 snapshot 的方式做資料同步 - dedupe 自動去重複化,當 1G 複製 10 份還是只會佔 1G - complation 一個非常快速的壓縮跟解壓縮的演算法 - 缺:需要仰賴記憶體、無法利用到百分之百 - 可用 SSD 解決,將 SSD 作 write cache 替代記憶體,當寫入時先寫入 cache,解決記憶體被大量佔用的問題 - rsync 不知如何使用就用 - `-azv` z為壓縮檔 - `-av` - `sudo -s`: root 權限 - 如果電腦定時會出錯,就去看 crontab!! - Dump 是對於 ext 系列的檔案系統做備份 - bulletproof 雲端硬碟 - VeraCrypt - 擁有一張 SD 卡,別人在讀取時會以為這僅僅是一張格式化過的 SD 卡,只有自己在讀取時才會看到有備加密過的資料

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