由于条件原因，我只能在vmware虚拟机上进行模拟实验，开机的时候，发现sdb磁盘正常加载
然后通过lsblk命令查看挂载情况
[root@localhost ~]# lsblk name maj:min rm size ro type mountpoint sda 8:0 0 20g 0 disk ├─sda1 8:1 0 1g 0 part /boot └─sda2 8:2 0 19g 0 part ├─centos-root 253:0 0 17g 0 lvm / └─centos-swap 253:1 0 2g 0 lvm [swap] sdb 8:16 0 5g 0 disk └─sdb1 8:17 0 5g 0 part /data sr0 11:0 1 1024m 0 rom
进入/data目录，查看内容，并新建文件test，写入一句话：“this is test file.”，查看test内容
[root@localhost ~]# cd /data/ [root@localhost data]# ls lost+found [root@localhost data]# echo "this is test file." > test [root@localhost data]# ls lost+found test [root@localhost data]# cat test this is test file.
发现可以查看并正常写入文件，现在进入破坏阶段
硬盘进行分区格式化（ext4）会创建硬盘内的文件存取系统表（superblock、block、inode信息），文件新建、文 件写入到分区内，正常存取block块。
[root@localhost /]# dd if=/dev/zero of=/dev/sdb bs=1 count=2048
2048+0 records in 2048+0 records out 2048 bytes (2.0 kb) copied, 0.00410516 s, 499 kb/s
破坏磁盘后，进入/data目录，写入文件test2
[root@localhost data]# touch test2 touch: cannot touch ‘test2’: input/output error
发现写入文件报错，reboot重启机器报错，输入密码直接进入单用户系统
使用fsck修改文件系统
[root@localhiost ~]# fsck -t ext4 -y /dev/sdb fsck from util-linux 2.23.2 e2fsck 1.42.9(28-dec-2013) ext2fs_open2:bad magic number in super-block fsck.ext4:superblock invalid,trying backup blocks... /dev/sdb was not cleanly unmounted, check forced. pass 1 : checking inodes,blocks,and sizes pass 2 : checking directory structure pass 3 : checking directory connectivity pass 4 : checking reference counts pass 5 : checking group summary information free blocks count wrong for group #1 (31740, counted=31739). fix? yes free blocks count wrong (5116558, counted=5116557). fix? yes free inodes count wrong for group #0 (8181, counted=8180). fix? yes free inodes count wrong (1310709, counted=1310708). fix? yes /dev/sdb : ***** file system was modified ***** /dev/sdb : 12/1310720 files (0.0% non-contiguous), 126323/5242880 blocks
修复完成后reboot，重启系统。
重新进入系统，然后重新进行写入文件测试。
[root@localhost ~]# cd /data [root@localhost data]# ls lost+found test [root@localhost data]# cat test this is test file. [root@localhost deta]# echo "this is test2 file." > test2 [root@localhost data]# ls lost+found test test2 [root@localhost data]# cat test2 this is test2 file.
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