wiki:jazz/10-07-18
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Version 2 (modified by jazz, 16 years ago) (diff)

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2010-07-18

  • [備忘] 修復 reiserfs 壞軌問題
    • [狀況] 以前裝的一台 server 因為電源瞬斷，復電後發生硬碟資料疑似壞軌而有問題。
    • 雖然用 Clonezilla Live CD 專家模式，加入 --resecure 參數，仍舊無法順利備份。
    • [參考] ​Repairing ReiserFS file system with reiserfsck
    • [參考] ​Dealing with ReiserFS bad blocks
    • STEP 1 : 低階備份的指令 
      # ddrescue /dev/sda /dev/sdb

或者

# dd if=/dev/sda of=/dev/sdb conv=noerror,sync

看到一個更神奇的指令是用 SSH 把運作中的硬碟資訊 dump 到遠端

$ ssh ${deadserver} dd if=/dev/hda1 conv=noerror,sync > hda1.img

      conv=noerror 會略過壞軌的錯誤，繼續複製
conv=sync    遇到壞軌時，會填入 zero 以維持資料完整性
    • STEP 2 : 用 badblocks 指令確認壞軌位置，產生 badblocksfile 並重新做 fsck 
      # blocksize=$(debugreiserfs <device> | grep -i 'blocksize')
# badblocks -n -b $blocksize -o badblocksfile $(your_device)
# reiserfsck --fix-fixable --badblocks badblocksfile $(your_device)