linux磁盘头数据损坏修复Oracle数据库

[root@pgtest testdata]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/mapper/vg_firsouler-lv_root                      9.5G  7.1G  2.0G  79% /tmpfs                 996M   72K  996M   1% /dev/shm/dev/sda1             477M   42M  410M  10% /boot/dev/mapper/pgvg-lvpg                       19G  4.4G   14G  25% /pgdata/dev/sdc1             5.8G   12M  5.5G   1% /testdata[root@pgtest testdata]# lsanalyze_new_cluster.sh  gp2020.cfg  lost+found  ojdbc6.jar[root@pgtest testdata]#

[root@pgtest testdata]# cd /[root@pgtest /]# dd if=/dev/zero of=/dev/sdc1 bs=1024 count=88+0 records in8+0 records out8192 bytes (8.2 kB) copied, 0.00100304 s, 8.2 MB/s#再次查看，testdata目录下找不到文件 ,df -h也无法查看[root@pgtest /]# cd /testdata/[root@pgtest testdata]# ls[root@pgtest testdata]# cd /[root@pgtest /]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/mapper/vg_firsouler-lv_root                      9.5G  7.1G  2.0G  79% /tmpfs                 996M   72K  996M   1% /dev/shm/dev/sda1             477M   42M  410M  10% /boot/dev/mapper/pgvg-lvpg                       19G  4.4G   14G  25% /pgdata

[root@pgtest /]# umount /testdata/[root@pgtest /]# mount /testdata/mount: wrong fs type, bad option, bad superblock on /dev/sdc1,       missing codepage or helper program, or other error       In some cases useful info is found in syslog - try       dmesg | tail  or so

[root@pgtest /]# fsck /dev/sdc1fsck from util-linux-ng 2.17.2e2fsck 1.41.12 (17-May-2010)fsck.ext4: Superblock invalid, trying backup blocks.../dev/sdc1 was not cleanly unmounted, check forced.Pass 1: Checking inodes, blocks, and sizesPass 2: Checking directory structurePass 3: Checking directory connectivityPass 4: Checking reference countsPass 5: Checking group summary informationFree inodes count wrong for group #0 (8181, counted=8178).Fix<y>? yesFree inodes count wrong (393205, counted=393202).Fix<y>? yes/dev/sdc1: ***** FILE SYSTEM WAS MODIFIED *****/dev/sdc1: 14/393216 files (0.0% non-contiguous), 60526/1572354 blocks[root@pgtest /]# mount /testdata/[root@pgtest /]# cd /testdata/[root@pgtest testdata]# lsanalyze_new_cluster.sh  gp2020.cfg  lost+found  ojdbc6.jar[root@pgtest testdata]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/mapper/vg_firsouler-lv_root                      9.5G  7.1G  2.0G  79% /tmpfs                 996M   72K  996M   1% /dev/shm/dev/sda1             477M   42M  410M  10% /boot/dev/mapper/pgvg-lvpg                       19G  4.4G   14G  25% /pgdata/dev/sdc1             5.8G   12M  5.5G   1% /testdata[root@pgtest testdata]#