转载自http://blog.Sina.cn/d pool/blog/s/blog _8ea8 e9d 50102 vuqq.html
数据很宝贵。 请小心操作。
通常，在执行磁盘操作之前必须备份磁盘上的数据，并在执行操作之前将磁盘的所有内容备份到其他磁盘。 如果这个故障磁盘是20g的话，就需要20g的备份空间。
备份命令是#dd if=/dev/baddrive of=/storagearea
注意：首先，设备文件系统类型file -s /dev/sdb
[ root @ DHCP-0-175~~ ] # dumpe2fs/dev/SDB1dumpe2fs1.39(29-may-2006 ) dumpe2fs : badmagicnumberinsuper-block SD B1 couldn ' tfindvalidfilesystemsuperblock.[ SD B1 tune2fs 1.39 (29-may-229 tune2fs : badmagicnumberinsuper-blockwhiletryingtoopen/dev/SD B1 couldn ' tfindvalidfiled filer
查看super block备份
[ root @ 10-4-1-38~] # * * mke2fs-n/dev/vdb * * mke2fs1. 41.12 (17-may-2010 )文件系统标签=ostype stripewidth=0blocks 3276800 inodes，13107200 blocks 655360 blocks (5.00 % )。 reservedforthesuperuserfirstdatablock=0maximumfilesystemblocks=4294967296400块组32768块spergroup， 3768 fragmentspergroup 8192 inodespergroupsuperblockbackbackupsstoredonblocks 336032768、98304、163840、229376、294912、819200 1600
[ root @ DHCP-0-175~] # fsck.ext3-b 98304/dev/SD B1 e2fsck 1.39 (29-may-2006 ) sdb1 was not cleanly unmounted， cheear块， andsizespass 2: checkingdirectorystructurepass : checkingdirectoryconnectivitypass 43360 checkingreferencecountspass 53360 sdb 1: * * * * * filesystemwasmodified * * * * sdb 1:11/123648 files (9.1 %非连续性)
[ root @ DHCP-0-175~~ ] # dumpe2fs/dev/SDB1dumpe2fs1.39(29-may-2006 ) ) ) ) ) 65文件系统卷名称： SD B1 lastmountedon 3360 aaaf 39文件系统管理时间修订版# :1 (动态) )。 file system features 3360 has _ journal resize _ inode dir _ indexfiletypesparse _ super large _ filedefaultmountoptions 3360 (文件系统功能表60 continuefilesystemostype : linuxinodecount :123648 block count :24691 re service 336012349 free blocks :238693 free inodes 0blocksize:4096 .如果上述方法不行，可以尝试以下方法，但风险为http://www.Sina
- swritesuperblockandgroupdescriptorsonly.thisisusefulifallofthesuperblockandbackupsuperblocksarecorrrupted， anda last-ditchrecoverymethodisdesired.itcausesmke2fstoreinitializethesuperblockandgroupdescriptors， wilenottouchingtheinodetableandtheblockandinodebitmaps.thee2fsckprogramshouldberunimmediatelyafterthisoptionisused， andthereisnoguaranteethatanydatawillbesalvageable.itiscriticaltospecifythecorrectfilesystemblocksizewhenusingthisoption，or
[ root @ DHCP-0-175~~ ] # mke2fs-s/dev/SD B1 mke2fs 1.39 (29-may-2006 )文件系统标签=ostype 3360 linuxblocksion 9656积木4882积木(5.00 % ) reservedforthesuperuserfirstdatablock=1maximumfilesystemblocks=6737100812积木组8192积木despergroupsuperblockbackupsstoredonblocks 33608193、24577、40961、57345， 73729 writingsuperblocksandfilesystemaccountinginformation 3360 donethisfilesystemwillbeautomaticallycheckedevery 37 mounts or 180数据中心e tune2fs-cor-ITO override.[ root @ DHCP-0-175~] # mount/dev/SD B1/mnt/[ root @ DHCP ]